1 files changed, 717 insertions, 745 deletions

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index efff8078e395..755b842f1f9b 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -20,13 +20,25 @@
 #include <limits.h>
 #include <stdbool.h>
 #include <errno.h>
+
+#include <hash.h>
+#include <hashtable.h>
+#include <list.h>
+#include <xalloc.h>
 #include "modpost.h"
 #include "../../include/linux/license.h"
 
+#define MODULE_NS_PREFIX "module:"
+
+static bool module_enabled;
 /* Are we using CONFIG_MODVERSIONS? */
 static bool modversions;
 /* Is CONFIG_MODULE_SRCVERSION_ALL set? */
 static bool all_versions;
+/* Is CONFIG_BASIC_MODVERSIONS set? */
+static bool basic_modversions;
+/* Is CONFIG_EXTENDED_MODVERSIONS set? */
+static bool extended_modversions;
 /* If we are modposting external module set to 1 */
 static bool external_module;
 /* Only warn about unresolved symbols */
@@ -34,6 +46,9 @@ static bool warn_unresolved;
 
 static int sec_mismatch_count;
 static bool sec_mismatch_warn_only = true;
+/* Trim EXPORT_SYMBOLs that are unused by in-tree modules */
+static bool trim_unused_exports;
+
 /* ignore missing files */
 static bool ignore_missing_files;
 /* If set to 1, only warn (instead of error) about missing ns imports */
@@ -41,6 +56,11 @@ static bool allow_missing_ns_imports;
 
 static bool error_occurred;
 
+static bool extra_warn;
+
+bool target_is_big_endian;
+bool host_is_big_endian;
+
 /*
  * Cut off the warnings when there are too many. This typically occurs when
  * vmlinux is missing. ('make modules' without building vmlinux.)
@@ -54,23 +74,15 @@ static unsigned int nr_unresolved;
 
 #define MODULE_NAME_LEN (64 - sizeof(Elf_Addr))
 
-void __attribute__((format(printf, 2, 3)))
-modpost_log(enum loglevel loglevel, const char *fmt, ...)
+void modpost_log(bool is_error, const char *fmt, ...)
 {
 	va_list arglist;
 
-	switch (loglevel) {
-	case LOG_WARN:
-		fprintf(stderr, "WARNING: ");
-		break;
-	case LOG_ERROR:
+	if (is_error) {
 		fprintf(stderr, "ERROR: ");
-		break;
-	case LOG_FATAL:
-		fprintf(stderr, "FATAL: ");
-		break;
-	default: /* invalid loglevel, ignore */
-		break;
+		error_occurred = true;
+	} else {
+		fprintf(stderr, "WARNING: ");
 	}
 
 	fprintf(stderr, "modpost: ");
@@ -78,11 +90,6 @@ modpost_log(enum loglevel loglevel, const char *fmt, ...)
 	va_start(arglist, fmt);
 	vfprintf(stderr, fmt, arglist);
 	va_end(arglist);
-
-	if (loglevel == LOG_FATAL)
-		exit(1);
-	if (loglevel == LOG_ERROR)
-		error_occurred = true;
 }
 
 static inline bool strends(const char *str, const char *postfix)
@@ -93,12 +100,16 @@ static inline bool strends(const char *str, const char *postfix)
 	return strcmp(str + strlen(str) - strlen(postfix), postfix) == 0;
 }
 
-void *do_nofail(void *ptr, const char *expr)
+/**
+ * get_basename - return the last part of a pathname.
+ *
+ * @path: path to extract the filename from.
+ */
+const char *get_basename(const char *path)
 {
-	if (!ptr)
-		fatal("Memory allocation failure: %s.\n", expr);
+	const char *tail = strrchr(path, '/');
 
-	return ptr;
+	return tail ? tail + 1 : path;
 }
 
 char *read_text_file(const char *filename)
@@ -119,7 +130,7 @@ char *read_text_file(const char *filename)
 		exit(1);
 	}
 
-	buf = NOFAIL(malloc(st.st_size + 1));
+	buf = xmalloc(st.st_size + 1);
 
 	nbytes = st.st_size;
 
@@ -162,12 +173,13 @@ char *get_line(char **stringp)
 /* A list of all modules we processed */
 LIST_HEAD(modules);
 
-static struct module *find_module(const char *modname)
+static struct module *find_module(const char *filename, const char *modname)
 {
 	struct module *mod;
 
 	list_for_each_entry(mod, &modules, list) {
-		if (strcmp(mod->name, modname) == 0)
+		if (!strcmp(mod->dump_file, filename) &&
+		    !strcmp(mod->name, modname))
 			return mod;
 	}
 	return NULL;
@@ -177,13 +189,14 @@ static struct module *new_module(const char *name, size_t namelen)
 {
 	struct module *mod;
 
-	mod = NOFAIL(malloc(sizeof(*mod) + namelen + 1));
+	mod = xmalloc(sizeof(*mod) + namelen + 1);
 	memset(mod, 0, sizeof(*mod));
 
 	INIT_LIST_HEAD(&mod->exported_symbols);
 	INIT_LIST_HEAD(&mod->unresolved_symbols);
 	INIT_LIST_HEAD(&mod->missing_namespaces);
 	INIT_LIST_HEAD(&mod->imported_namespaces);
+	INIT_LIST_HEAD(&mod->aliases);
 
 	memcpy(mod->name, name, namelen);
 	mod->name[namelen] = '\0';
@@ -191,8 +204,8 @@ static struct module *new_module(const char *name, size_t namelen)
 
 	/*
 	 * Set mod->is_gpl_compatible to true by default. If MODULE_LICENSE()
-	 * is missing, do not check the use for EXPORT_SYMBOL_GPL() becasue
-	 * modpost will exit wiht error anyway.
+	 * is missing, do not check the use for EXPORT_SYMBOL_GPL() because
+	 * modpost will exit with an error anyway.
 	 */
 	mod->is_gpl_compatible = true;
 
@@ -201,37 +214,21 @@ static struct module *new_module(const char *name, size_t namelen)
 	return mod;
 }
 
-/* A hash of all exported symbols,
- * struct symbol is also used for lists of unresolved symbols */
-
-#define SYMBOL_HASH_SIZE 1024
-
 struct symbol {
-	struct symbol *next;
+	struct hlist_node hnode;/* link to hash table */
 	struct list_head list;	/* link to module::exported_symbols or module::unresolved_symbols */
 	struct module *module;
 	char *namespace;
 	unsigned int crc;
 	bool crc_valid;
 	bool weak;
+	bool is_func;
 	bool is_gpl_only;	/* exported by EXPORT_SYMBOL_GPL */
+	bool used;		/* there exists a user of this symbol */
 	char name[];
 };
 
-static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
-
-/* This is based on the hash algorithm from gdbm, via tdb */
-static inline unsigned int tdb_hash(const char *name)
-{
-	unsigned value;	/* Used to compute the hash value.  */
-	unsigned   i;	/* Used to cycle through random values. */
-
-	/* Set the initial value from the key size. */
-	for (value = 0x238F13AF * strlen(name), i = 0; name[i]; i++)
-		value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
-
-	return (1103515243 * value + 12345);
-}
+static HASHTABLE_DEFINE(symbol_hashtable, 1U << 10);
 
 /**
  * Allocate a new symbols for use in the hash of exported symbols or
@@ -239,7 +236,7 @@ static inline unsigned int tdb_hash(const char *name)
  **/
 static struct symbol *alloc_symbol(const char *name)
 {
-	struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
+	struct symbol *s = xmalloc(sizeof(*s) + strlen(name) + 1);
 
 	memset(s, 0, sizeof(*s));
 	strcpy(s->name, name);
@@ -250,11 +247,7 @@ static struct symbol *alloc_symbol(const char *name)
 /* For the hash of exported symbols */
 static void hash_add_symbol(struct symbol *sym)
 {
-	unsigned int hash;
-
-	hash = tdb_hash(sym->name) % SYMBOL_HASH_SIZE;
-	sym->next = symbolhash[hash];
-	symbolhash[hash] = sym;
+	hash_add(symbol_hashtable, &sym->hnode, hash_str(sym->name));
 }
 
 static void sym_add_unresolved(const char *name, struct module *mod, bool weak)
@@ -275,7 +268,7 @@ static struct symbol *sym_find_with_module(const char *name, struct module *mod)
 	if (name[0] == '.')
 		name++;
 
-	for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s = s->next) {
+	hash_for_each_possible(symbol_hashtable, s, hnode, hash_str(name)) {
 		if (strcmp(s->name, name) == 0 && (!mod || s->module == mod))
 			return s;
 	}
@@ -296,6 +289,13 @@ static bool contains_namespace(struct list_head *head, const char *namespace)
 {
 	struct namespace_list *list;
 
+	/*
+	 * The default namespace is null string "", which is always implicitly
+	 * contained.
+	 */
+	if (!namespace[0])
+		return true;
+
 	list_for_each_entry(list, head, list) {
 		if (!strcmp(list->namespace, namespace))
 			return true;
@@ -309,8 +309,7 @@ static void add_namespace(struct list_head *head, const char *namespace)
 	struct namespace_list *ns_entry;
 
 	if (!contains_namespace(head, namespace)) {
-		ns_entry = NOFAIL(malloc(sizeof(*ns_entry) +
-					 strlen(namespace) + 1));
+		ns_entry = xmalloc(sizeof(*ns_entry) + strlen(namespace) + 1);
 		strcpy(ns_entry->namespace, namespace);
 		list_add_tail(&ns_entry->list, head);
 	}
@@ -349,28 +348,8 @@ static const char *sec_name(const struct elf_info *info, unsigned int secindex)
 	return sech_name(info, &info->sechdrs[secindex]);
 }
 
-#define strstarts(str, prefix) (strncmp(str, prefix, strlen(prefix)) == 0)
-
-static void sym_update_namespace(const char *symname, const char *namespace)
-{
-	struct symbol *s = find_symbol(symname);
-
-	/*
-	 * That symbol should have been created earlier and thus this is
-	 * actually an assertion.
-	 */
-	if (!s) {
-		error("Could not update namespace(%s) for symbol %s\n",
-		      namespace, symname);
-		return;
-	}
-
-	free(s->namespace);
-	s->namespace = namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
-}
-
 static struct symbol *sym_add_exported(const char *name, struct module *mod,
-				       bool gpl_only)
+				       bool gpl_only, const char *namespace)
 {
 	struct symbol *s = find_symbol(name);
 
@@ -383,6 +362,7 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod,
 	s = alloc_symbol(name);
 	s->module = mod;
 	s->is_gpl_only = gpl_only;
+	s->namespace = xstrdup(namespace);
 	list_add_tail(&s->list, &mod->exported_symbols);
 	hash_add_symbol(s);
 
@@ -454,6 +434,18 @@ static int parse_elf(struct elf_info *info, const char *filename)
 		/* Not an ELF file - silently ignore it */
 		return 0;
 	}
+
+	switch (hdr->e_ident[EI_DATA]) {
+	case ELFDATA2LSB:
+		target_is_big_endian = false;
+		break;
+	case ELFDATA2MSB:
+		target_is_big_endian = true;
+		break;
+	default:
+		fatal("target endian is unknown\n");
+	}
+
 	/* Fix endianness in ELF header */
 	hdr->e_type      = TO_NATIVE(hdr->e_type);
 	hdr->e_machine   = TO_NATIVE(hdr->e_machine);
@@ -476,11 +468,9 @@ static int parse_elf(struct elf_info *info, const char *filename)
 		fatal("%s: not relocatable object.", filename);
 
 	/* Check if file offset is correct */
-	if (hdr->e_shoff > info->size) {
+	if (hdr->e_shoff > info->size)
 		fatal("section header offset=%lu in file '%s' is bigger than filesize=%zu\n",
 		      (unsigned long)hdr->e_shoff, filename, info->size);
-		return 0;
-	}
 
 	if (hdr->e_shnum == SHN_UNDEF) {
 		/*
@@ -518,18 +508,22 @@ static int parse_elf(struct elf_info *info, const char *filename)
 		const char *secname;
 		int nobits = sechdrs[i].sh_type == SHT_NOBITS;
 
-		if (!nobits && sechdrs[i].sh_offset > info->size) {
+		if (!nobits && sechdrs[i].sh_offset > info->size)
 			fatal("%s is truncated. sechdrs[i].sh_offset=%lu > sizeof(*hrd)=%zu\n",
 			      filename, (unsigned long)sechdrs[i].sh_offset,
 			      sizeof(*hdr));
-			return 0;
-		}
+
 		secname = secstrings + sechdrs[i].sh_name;
 		if (strcmp(secname, ".modinfo") == 0) {
 			if (nobits)
 				fatal("%s has NOBITS .modinfo\n", filename);
 			info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
 			info->modinfo_len = sechdrs[i].sh_size;
+		} else if (!strcmp(secname, ".export_symbol")) {
+			info->export_symbol_secndx = i;
+		} else if (!strcmp(secname, ".no_trim_symbol")) {
+			info->no_trim_symbol = (void *)hdr + sechdrs[i].sh_offset;
+			info->no_trim_symbol_len = sechdrs[i].sh_size;
 		}
 
 		if (sechdrs[i].sh_type == SHT_SYMTAB) {
@@ -576,11 +570,14 @@ static int parse_elf(struct elf_info *info, const char *filename)
 			*p = TO_NATIVE(*p);
 	}
 
+	symsearch_init(info);
+
 	return 1;
 }
 
 static void parse_elf_finish(struct elf_info *info)
 {
+	symsearch_finish(info);
 	release_file(info->hdr, info->size);
 }
 
@@ -610,10 +607,10 @@ static int ignore_undef_symbol(struct elf_info *info, const char *symname)
 		    strcmp(symname, ".TOC.") == 0)
 			return 1;
 
-	if (info->hdr->e_machine == EM_S390)
-		/* Expoline thunks are linked on all kernel modules during final link of .ko */
-		if (strstarts(symname, "__s390_indirect_jump_r"))
-			return 1;
+	/* ignore linker-created section bounds variables */
+	if (strstarts(symname, "__start_") || strstarts(symname, "__stop_"))
+		return 1;
+
 	/* Do not ignore this symbol */
 	return 0;
 }
@@ -641,7 +638,7 @@ static void handle_symbol(struct module *mod, struct elf_info *info,
 			if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
 				break;
 			if (symname[0] == '.') {
-				char *munged = NOFAIL(strdup(symname));
+				char *munged = xstrdup(symname);
 				munged[0] = '_';
 				munged[1] = toupper(munged[1]);
 				symname = munged;
@@ -652,18 +649,6 @@ static void handle_symbol(struct module *mod, struct elf_info *info,
 				   ELF_ST_BIND(sym->st_info) == STB_WEAK);
 		break;
 	default:
-		/* All exported symbols */
-		if (strstarts(symname, "__ksymtab_")) {
-			const char *name, *secname;
-
-			name = symname + strlen("__ksymtab_");
-			secname = sec_name(info, get_secindex(info, sym));
-
-			if (strstarts(secname, "___ksymtab_gpl+"))
-				sym_add_exported(name, mod, true);
-			else if (strstarts(secname, "___ksymtab+"))
-				sym_add_exported(name, mod, false);
-		}
 		if (strcmp(symname, "init_module") == 0)
 			mod->has_init = true;
 		if (strcmp(symname, "cleanup_module") == 0)
@@ -721,10 +706,7 @@ static char *get_modinfo(struct elf_info *info, const char *tag)
 
 static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
 {
-	if (sym)
-		return elf->strtab + sym->st_name;
-	else
-		return "(unknown)";
+	return sym ? elf->strtab + sym->st_name : "";
 }
 
 /*
@@ -773,6 +755,7 @@ static const char *const section_white_list[] =
 	".fmt_slot*",			/* EZchip */
 	".gnu.lto*",
 	".discard.*",
+	".llvm.call-graph-profile",	/* call graph */
 	NULL
 };
 
@@ -800,71 +783,32 @@ static void check_section(const char *modname, struct elf_info *elf,
 
 
 #define ALL_INIT_DATA_SECTIONS \
-	".init.setup", ".init.rodata", ".meminit.rodata", \
-	".init.data", ".meminit.data"
-#define ALL_EXIT_DATA_SECTIONS \
-	".exit.data", ".memexit.data"
-
-#define ALL_INIT_TEXT_SECTIONS \
-	".init.text", ".meminit.text"
-#define ALL_EXIT_TEXT_SECTIONS \
-	".exit.text", ".memexit.text"
+	".init.setup", ".init.rodata", ".init.data"
 
 #define ALL_PCI_INIT_SECTIONS	\
 	".pci_fixup_early", ".pci_fixup_header", ".pci_fixup_final", \
 	".pci_fixup_enable", ".pci_fixup_resume", \
 	".pci_fixup_resume_early", ".pci_fixup_suspend"
 
-#define ALL_XXXINIT_SECTIONS MEM_INIT_SECTIONS
-#define ALL_XXXEXIT_SECTIONS MEM_EXIT_SECTIONS
-
-#define ALL_INIT_SECTIONS INIT_SECTIONS, ALL_XXXINIT_SECTIONS
-#define ALL_EXIT_SECTIONS EXIT_SECTIONS, ALL_XXXEXIT_SECTIONS
+#define ALL_INIT_SECTIONS ".init.*"
+#define ALL_EXIT_SECTIONS ".exit.*"
 
 #define DATA_SECTIONS ".data", ".data.rel"
 #define TEXT_SECTIONS ".text", ".text.*", ".sched.text", \
-		".kprobes.text", ".cpuidle.text", ".noinstr.text"
+		".kprobes.text", ".cpuidle.text", ".noinstr.text", \
+		".ltext", ".ltext.*"
 #define OTHER_TEXT_SECTIONS ".ref.text", ".head.text", ".spinlock.text", \
 		".fixup", ".entry.text", ".exception.text", \
-		".coldtext", ".softirqentry.text"
-
-#define INIT_SECTIONS      ".init.*"
-#define MEM_INIT_SECTIONS  ".meminit.*"
-
-#define EXIT_SECTIONS      ".exit.*"
-#define MEM_EXIT_SECTIONS  ".memexit.*"
+		".coldtext", ".softirqentry.text", ".irqentry.text"
 
-#define ALL_TEXT_SECTIONS  ALL_INIT_TEXT_SECTIONS, ALL_EXIT_TEXT_SECTIONS, \
+#define ALL_TEXT_SECTIONS  ".init.text", ".exit.text", \
 		TEXT_SECTIONS, OTHER_TEXT_SECTIONS
 
-/* init data sections */
-static const char *const init_data_sections[] =
-	{ ALL_INIT_DATA_SECTIONS, NULL };
-
-/* all init sections */
-static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };
-
-/* all text sections */
-static const char *const text_sections[] = { ALL_TEXT_SECTIONS, NULL };
-
-/* data section */
-static const char *const data_sections[] = { DATA_SECTIONS, NULL };
-
-static const char *const head_sections[] = { ".head.text*", NULL };
-static const char *const linker_symbols[] =
-	{ "__init_begin", "_sinittext", "_einittext", NULL };
-static const char *const optim_symbols[] = { "*.constprop.*", NULL };
-
 enum mismatch {
-	TEXT_TO_ANY_INIT,
-	DATA_TO_ANY_INIT,
-	TEXT_TO_ANY_EXIT,
-	DATA_TO_ANY_EXIT,
+	TEXTDATA_TO_ANY_INIT_EXIT,
 	XXXINIT_TO_SOME_INIT,
-	XXXEXIT_TO_SOME_EXIT,
 	ANY_INIT_TO_ANY_EXIT,
 	ANY_EXIT_TO_ANY_INIT,
-	EXPORT_TO_INIT_EXIT,
 	EXTABLE_TO_NON_TEXT,
 };
 
@@ -880,67 +824,22 @@ enum mismatch {
  * targeting sections in this array (white-list).  Can be empty.
  *
  * @mismatch: Type of mismatch.
- *
- * @handler: Specific handler to call when a match is found.  If NULL,
- * default_mismatch_handler() will be called.
- *
  */
 struct sectioncheck {
 	const char *fromsec[20];
 	const char *bad_tosec[20];
 	const char *good_tosec[20];
 	enum mismatch mismatch;
-	void (*handler)(const char *modname, struct elf_info *elf,
-			const struct sectioncheck* const mismatch,
-			Elf_Rela *r, Elf_Sym *sym, const char *fromsec);
-
 };
 
-static void extable_mismatch_handler(const char *modname, struct elf_info *elf,
-				     const struct sectioncheck* const mismatch,
-				     Elf_Rela *r, Elf_Sym *sym,
-				     const char *fromsec);
-
 static const struct sectioncheck sectioncheck[] = {
 /* Do not reference init/exit code/data from
  * normal code and data
  */
 {
-	.fromsec = { TEXT_SECTIONS, NULL },
-	.bad_tosec = { ALL_INIT_SECTIONS, NULL },
-	.mismatch = TEXT_TO_ANY_INIT,
-},
-{
-	.fromsec = { DATA_SECTIONS, NULL },
-	.bad_tosec = { ALL_XXXINIT_SECTIONS, NULL },
-	.mismatch = DATA_TO_ANY_INIT,
-},
-{
-	.fromsec = { DATA_SECTIONS, NULL },
-	.bad_tosec = { INIT_SECTIONS, NULL },
-	.mismatch = DATA_TO_ANY_INIT,
-},
-{
-	.fromsec = { TEXT_SECTIONS, NULL },
-	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
-	.mismatch = TEXT_TO_ANY_EXIT,
-},
-{
-	.fromsec = { DATA_SECTIONS, NULL },
-	.bad_tosec = { ALL_EXIT_SECTIONS, NULL },
-	.mismatch = DATA_TO_ANY_EXIT,
-},
-/* Do not reference init code/data from meminit code/data */
-{
-	.fromsec = { ALL_XXXINIT_SECTIONS, NULL },
-	.bad_tosec = { INIT_SECTIONS, NULL },
-	.mismatch = XXXINIT_TO_SOME_INIT,
-},
-/* Do not reference exit code/data from memexit code/data */
-{
-	.fromsec = { ALL_XXXEXIT_SECTIONS, NULL },
-	.bad_tosec = { EXIT_SECTIONS, NULL },
-	.mismatch = XXXEXIT_TO_SOME_EXIT,
+	.fromsec = { TEXT_SECTIONS, DATA_SECTIONS, NULL },
+	.bad_tosec = { ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL },
+	.mismatch = TEXTDATA_TO_ANY_INIT_EXIT,
 },
 /* Do not use exit code/data from init code */
 {
@@ -956,15 +855,9 @@ static const struct sectioncheck sectioncheck[] = {
 },
 {
 	.fromsec = { ALL_PCI_INIT_SECTIONS, NULL },
-	.bad_tosec = { INIT_SECTIONS, NULL },
+	.bad_tosec = { ALL_INIT_SECTIONS, NULL },
 	.mismatch = ANY_INIT_TO_ANY_EXIT,
 },
-/* Do not export init/exit functions or data */
-{
-	.fromsec = { "___ksymtab*", NULL },
-	.bad_tosec = { INIT_SECTIONS, EXIT_SECTIONS, NULL },
-	.mismatch = EXPORT_TO_INIT_EXIT,
-},
 {
 	.fromsec = { "__ex_table", NULL },
 	/* If you're adding any new black-listed sections in here, consider
@@ -973,7 +866,6 @@ static const struct sectioncheck sectioncheck[] = {
 	.bad_tosec = { ".altinstr_replacement", NULL },
 	.good_tosec = {ALL_TEXT_SECTIONS , NULL},
 	.mismatch = EXTABLE_TO_NON_TEXT,
-	.handler = extable_mismatch_handler,
 }
 };
 
@@ -1047,470 +939,344 @@ static const struct sectioncheck *section_mismatch(
  *   fromsec = text section
  *   refsymname = *.constprop.*
  *
- * Pattern 6:
- *   Hide section mismatch warnings for ELF local symbols.  The goal
- *   is to eliminate false positive modpost warnings caused by
- *   compiler-generated ELF local symbol names such as ".LANCHOR1".
- *   Autogenerated symbol names bypass modpost's "Pattern 2"
- *   whitelisting, which relies on pattern-matching against symbol
- *   names to work.  (One situation where gcc can autogenerate ELF
- *   local symbols is when "-fsection-anchors" is used.)
  **/
-static int secref_whitelist(const struct sectioncheck *mismatch,
-			    const char *fromsec, const char *fromsym,
+static int secref_whitelist(const char *fromsec, const char *fromsym,
 			    const char *tosec, const char *tosym)
 {
 	/* Check for pattern 1 */
-	if (match(tosec, init_data_sections) &&
-	    match(fromsec, data_sections) &&
+	if (match(tosec, PATTERNS(ALL_INIT_DATA_SECTIONS)) &&
+	    match(fromsec, PATTERNS(DATA_SECTIONS)) &&
 	    strstarts(fromsym, "__param"))
 		return 0;
 
 	/* Check for pattern 1a */
 	if (strcmp(tosec, ".init.text") == 0 &&
-	    match(fromsec, data_sections) &&
+	    match(fromsec, PATTERNS(DATA_SECTIONS)) &&
 	    strstarts(fromsym, "__param_ops_"))
 		return 0;
 
 	/* symbols in data sections that may refer to any init/exit sections */
 	if (match(fromsec, PATTERNS(DATA_SECTIONS)) &&
 	    match(tosec, PATTERNS(ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS)) &&
-	    match(fromsym, PATTERNS("*_template", // scsi uses *_template a lot
-				    "*_timer", // arm uses ops structures named _timer a lot
-				    "*_sht", // scsi also used *_sht to some extent
-				    "*_ops",
-				    "*_probe",
-				    "*_probe_one",
-				    "*_console")))
-		return 0;
-
-	/* symbols in data sections that may refer to meminit/exit sections */
-	if (match(fromsec, PATTERNS(DATA_SECTIONS)) &&
-	    match(tosec, PATTERNS(ALL_XXXINIT_SECTIONS, ALL_EXIT_SECTIONS)) &&
-	    match(fromsym, PATTERNS("*driver")))
+	    match(fromsym, PATTERNS("*_ops", "*_probe", "*_console")))
 		return 0;
 
 	/* Check for pattern 3 */
-	if (match(fromsec, head_sections) &&
-	    match(tosec, init_sections))
+	if (strstarts(fromsec, ".head.text") &&
+	    match(tosec, PATTERNS(ALL_INIT_SECTIONS)))
 		return 0;
 
 	/* Check for pattern 4 */
-	if (match(tosym, linker_symbols))
+	if (match(tosym, PATTERNS("__init_begin", "_sinittext", "_einittext")))
 		return 0;
 
 	/* Check for pattern 5 */
-	if (match(fromsec, text_sections) &&
-	    match(tosec, init_sections) &&
-	    match(fromsym, optim_symbols))
-		return 0;
-
-	/* Check for pattern 6 */
-	if (strstarts(fromsym, ".L"))
+	if (match(fromsec, PATTERNS(ALL_TEXT_SECTIONS)) &&
+	    match(tosec, PATTERNS(ALL_INIT_SECTIONS)) &&
+	    match(fromsym, PATTERNS("*.constprop.*")))
 		return 0;
 
 	return 1;
 }
 
-static inline int is_arm_mapping_symbol(const char *str)
+static Elf_Sym *find_fromsym(struct elf_info *elf, Elf_Addr addr,
+			     unsigned int secndx)
 {
-	return str[0] == '$' &&
-	       (str[1] == 'a' || str[1] == 'd' || str[1] == 't' || str[1] == 'x')
-	       && (str[2] == '\0' || str[2] == '.');
+	return symsearch_find_nearest(elf, addr, secndx, false, ~0);
 }
 
-/*
- * If there's no name there, ignore it; likewise, ignore it if it's
- * one of the magic symbols emitted used by current ARM tools.
- *
- * Otherwise if find_symbols_between() returns those symbols, they'll
- * fail the whitelist tests and cause lots of false alarms ... fixable
- * only by merging __exit and __init sections into __text, bloating
- * the kernel (which is especially evil on embedded platforms).
- */
-static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
+static Elf_Sym *find_tosym(struct elf_info *elf, Elf_Addr addr, Elf_Sym *sym)
 {
-	const char *name = elf->strtab + sym->st_name;
+	Elf_Sym *new_sym;
 
-	if (!name || !strlen(name))
-		return 0;
-	return !is_arm_mapping_symbol(name);
-}
-
-/**
- * Find symbol based on relocation record info.
- * In some cases the symbol supplied is a valid symbol so
- * return refsym. If st_name != 0 we assume this is a valid symbol.
- * In other cases the symbol needs to be looked up in the symbol table
- * based on section and address.
- *  **/
-static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf64_Sword addr,
-				Elf_Sym *relsym)
-{
-	Elf_Sym *sym;
-	Elf_Sym *near = NULL;
-	Elf64_Sword distance = 20;
-	Elf64_Sword d;
-	unsigned int relsym_secindex;
-
-	if (relsym->st_name != 0)
-		return relsym;
+	/* If the supplied symbol has a valid name, return it */
+	if (is_valid_name(elf, sym))
+		return sym;
 
-	relsym_secindex = get_secindex(elf, relsym);
-	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
-		if (get_secindex(elf, sym) != relsym_secindex)
-			continue;
-		if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
-			continue;
-		if (!is_valid_name(elf, sym))
-			continue;
-		if (sym->st_value == addr)
-			return sym;
-		/* Find a symbol nearby - addr are maybe negative */
-		d = sym->st_value - addr;
-		if (d < 0)
-			d = addr - sym->st_value;
-		if (d < distance) {
-			distance = d;
-			near = sym;
-		}
-	}
-	/* We need a close match */
-	if (distance < 20)
-		return near;
-	else
-		return NULL;
-}
-
-/*
- * Find symbols before or equal addr and after addr - in the section sec.
- * If we find two symbols with equal offset prefer one with a valid name.
- * The ELF format may have a better way to detect what type of symbol
- * it is, but this works for now.
- **/
-static Elf_Sym *find_elf_symbol2(struct elf_info *elf, Elf_Addr addr,
-				 const char *sec)
-{
-	Elf_Sym *sym;
-	Elf_Sym *near = NULL;
-	Elf_Addr distance = ~0;
-
-	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
-		const char *symsec;
-
-		if (is_shndx_special(sym->st_shndx))
-			continue;
-		symsec = sec_name(elf, get_secindex(elf, sym));
-		if (strcmp(symsec, sec) != 0)
-			continue;
-		if (!is_valid_name(elf, sym))
-			continue;
-		if (sym->st_value <= addr && addr - sym->st_value <= distance) {
-			distance = addr - sym->st_value;
-			near = sym;
-		}
-	}
-	return near;
-}
-
-static int is_function(Elf_Sym *sym)
-{
-	if (sym)
-		return ELF_ST_TYPE(sym->st_info) == STT_FUNC;
-	else
-		return -1;
-}
-
-static inline void get_pretty_name(int is_func, const char** name, const char** name_p)
-{
-	switch (is_func) {
-	case 0:	*name = "variable"; *name_p = ""; break;
-	case 1:	*name = "function"; *name_p = "()"; break;
-	default: *name = "(unknown reference)"; *name_p = ""; break;
-	}
+	/*
+	 * Strive to find a better symbol name, but the resulting name may not
+	 * match the symbol referenced in the original code.
+	 */
+	new_sym = symsearch_find_nearest(elf, addr, get_secindex(elf, sym),
+					 true, 20);
+	return new_sym ? new_sym : sym;
 }
 
-/*
- * Print a warning about a section mismatch.
- * Try to find symbols near it so user can find it.
- * Check whitelist before warning - it may be a false positive.
- */
-static void report_sec_mismatch(const char *modname,
-				const struct sectioncheck *mismatch,
-				const char *fromsec,
-				const char *fromsym,
-				const char *tosec, const char *tosym)
+static bool is_executable_section(struct elf_info *elf, unsigned int secndx)
 {
-	sec_mismatch_count++;
+	if (secndx >= elf->num_sections)
+		return false;
 
-	switch (mismatch->mismatch) {
-	case TEXT_TO_ANY_INIT:
-	case DATA_TO_ANY_INIT:
-	case TEXT_TO_ANY_EXIT:
-	case DATA_TO_ANY_EXIT:
-	case XXXINIT_TO_SOME_INIT:
-	case XXXEXIT_TO_SOME_EXIT:
-	case ANY_INIT_TO_ANY_EXIT:
-	case ANY_EXIT_TO_ANY_INIT:
-		warn("%s: section mismatch in reference: %s (section: %s) -> %s (section: %s)\n",
-		     modname, fromsym, fromsec, tosym, tosec);
-		break;
-	case EXPORT_TO_INIT_EXIT:
-		warn("%s: EXPORT_SYMBOL used for init/exit symbol: %s (section: %s)\n",
-		     modname, tosym, tosec);
-		break;
-	case EXTABLE_TO_NON_TEXT:
-		fatal("There's a special handler for this mismatch type, we should never get here.\n");
-		break;
-	}
+	return (elf->sechdrs[secndx].sh_flags & SHF_EXECINSTR) != 0;
 }
 
 static void default_mismatch_handler(const char *modname, struct elf_info *elf,
 				     const struct sectioncheck* const mismatch,
-				     Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
+				     Elf_Sym *tsym,
+				     unsigned int fsecndx, const char *fromsec, Elf_Addr faddr,
+				     const char *tosec, Elf_Addr taddr)
 {
-	const char *tosec;
-	Elf_Sym *to;
 	Elf_Sym *from;
 	const char *tosym;
 	const char *fromsym;
+	char taddr_str[16];
 
-	from = find_elf_symbol2(elf, r->r_offset, fromsec);
+	from = find_fromsym(elf, faddr, fsecndx);
 	fromsym = sym_name(elf, from);
 
-	tosec = sec_name(elf, get_secindex(elf, sym));
-	to = find_elf_symbol(elf, r->r_addend, sym);
-	tosym = sym_name(elf, to);
+	tsym = find_tosym(elf, taddr, tsym);
+	tosym = sym_name(elf, tsym);
 
 	/* check whitelist - we may ignore it */
-	if (secref_whitelist(mismatch,
-			     fromsec, fromsym, tosec, tosym)) {
-		report_sec_mismatch(modname, mismatch,
-				    fromsec, fromsym, tosec, tosym);
-	}
-}
+	if (!secref_whitelist(fromsec, fromsym, tosec, tosym))
+		return;
 
-static int is_executable_section(struct elf_info* elf, unsigned int section_index)
-{
-	if (section_index > elf->num_sections)
-		fatal("section_index is outside elf->num_sections!\n");
+	sec_mismatch_count++;
 
-	return ((elf->sechdrs[section_index].sh_flags & SHF_EXECINSTR) == SHF_EXECINSTR);
-}
+	if (!tosym[0])
+		snprintf(taddr_str, sizeof(taddr_str), "0x%x", (unsigned int)taddr);
 
-/*
- * We rely on a gross hack in section_rel[a]() calling find_extable_entry_size()
- * to know the sizeof(struct exception_table_entry) for the target architecture.
- */
-static unsigned int extable_entry_size = 0;
-static void find_extable_entry_size(const char* const sec, const Elf_Rela* r)
-{
 	/*
-	 * If we're currently checking the second relocation within __ex_table,
-	 * that relocation offset tells us the offsetof(struct
-	 * exception_table_entry, fixup) which is equal to sizeof(struct
-	 * exception_table_entry) divided by two.  We use that to our advantage
-	 * since there's no portable way to get that size as every architecture
-	 * seems to go with different sized types.  Not pretty but better than
-	 * hard-coding the size for every architecture..
+	 * The format for the reference source:      <symbol_name>+<offset> or <address>
+	 * The format for the reference destination: <symbol_name>          or <address>
 	 */
-	if (!extable_entry_size)
-		extable_entry_size = r->r_offset * 2;
+	warn("%s: section mismatch in reference: %s%s0x%x (section: %s) -> %s (section: %s)\n",
+	     modname, fromsym, fromsym[0] ? "+" : "",
+	     (unsigned int)(faddr - (fromsym[0] ? from->st_value : 0)),
+	     fromsec, tosym[0] ? tosym : taddr_str, tosec);
+
+	if (mismatch->mismatch == EXTABLE_TO_NON_TEXT) {
+		if (match(tosec, mismatch->bad_tosec))
+			fatal("The relocation at %s+0x%lx references\n"
+			      "section \"%s\" which is black-listed.\n"
+			      "Something is seriously wrong and should be fixed.\n"
+			      "You might get more information about where this is\n"
+			      "coming from by using scripts/check_extable.sh %s\n",
+			      fromsec, (long)faddr, tosec, modname);
+		else if (is_executable_section(elf, get_secindex(elf, tsym)))
+			warn("The relocation at %s+0x%lx references\n"
+			     "section \"%s\" which is not in the list of\n"
+			     "authorized sections.  If you're adding a new section\n"
+			     "and/or if this reference is valid, add \"%s\" to the\n"
+			     "list of authorized sections to jump to on fault.\n"
+			     "This can be achieved by adding \"%s\" to\n"
+			     "OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
+			     fromsec, (long)faddr, tosec, tosec, tosec);
+		else
+			error("%s+0x%lx references non-executable section '%s'\n",
+			      fromsec, (long)faddr, tosec);
+	}
 }
 
-static inline bool is_extable_fault_address(Elf_Rela *r)
+static void check_export_symbol(struct module *mod, struct elf_info *elf,
+				Elf_Addr faddr, const char *secname,
+				Elf_Sym *sym)
 {
+	static const char *prefix = "__export_symbol_";
+	const char *label_name, *name, *data;
+	Elf_Sym *label;
+	struct symbol *s;
+	bool is_gpl;
+
+	label = find_fromsym(elf, faddr, elf->export_symbol_secndx);
+	label_name = sym_name(elf, label);
+
+	if (!strstarts(label_name, prefix)) {
+		error("%s: .export_symbol section contains strange symbol '%s'\n",
+		      mod->name, label_name);
+		return;
+	}
+
+	if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
+	    ELF_ST_BIND(sym->st_info) != STB_WEAK) {
+		error("%s: local symbol '%s' was exported\n", mod->name,
+		      label_name + strlen(prefix));
+		return;
+	}
+
+	name = sym_name(elf, sym);
+	if (strcmp(label_name + strlen(prefix), name)) {
+		error("%s: .export_symbol section references '%s', but it does not seem to be an export symbol\n",
+		      mod->name, name);
+		return;
+	}
+
+	data = sym_get_data(elf, label);	/* license */
+	if (!strcmp(data, "GPL")) {
+		is_gpl = true;
+	} else if (!strcmp(data, "")) {
+		is_gpl = false;
+	} else {
+		error("%s: unknown license '%s' was specified for '%s'\n",
+		      mod->name, data, name);
+		return;
+	}
+
+	data += strlen(data) + 1;	/* namespace */
+	s = sym_add_exported(name, mod, is_gpl, data);
+
 	/*
-	 * extable_entry_size is only discovered after we've handled the
-	 * _second_ relocation in __ex_table, so only abort when we're not
-	 * handling the first reloc and extable_entry_size is zero.
+	 * We need to be aware whether we are exporting a function or
+	 * a data on some architectures.
 	 */
-	if (r->r_offset && extable_entry_size == 0)
-		fatal("extable_entry size hasn't been discovered!\n");
-
-	return ((r->r_offset == 0) ||
-		(r->r_offset % extable_entry_size == 0));
-}
-
-#define is_second_extable_reloc(Start, Cur, Sec)			\
-	(((Cur) == (Start) + 1) && (strcmp("__ex_table", (Sec)) == 0))
-
-static void report_extable_warnings(const char* modname, struct elf_info* elf,
-				    const struct sectioncheck* const mismatch,
-				    Elf_Rela* r, Elf_Sym* sym,
-				    const char* fromsec, const char* tosec)
-{
-	Elf_Sym* fromsym = find_elf_symbol2(elf, r->r_offset, fromsec);
-	const char* fromsym_name = sym_name(elf, fromsym);
-	Elf_Sym* tosym = find_elf_symbol(elf, r->r_addend, sym);
-	const char* tosym_name = sym_name(elf, tosym);
-	const char* from_pretty_name;
-	const char* from_pretty_name_p;
-	const char* to_pretty_name;
-	const char* to_pretty_name_p;
-
-	get_pretty_name(is_function(fromsym),
-			&from_pretty_name, &from_pretty_name_p);
-	get_pretty_name(is_function(tosym),
-			&to_pretty_name, &to_pretty_name_p);
-
-	warn("%s(%s+0x%lx): Section mismatch in reference from the %s %s%s to the %s %s:%s%s\n",
-	     modname, fromsec, (long)r->r_offset, from_pretty_name,
-	     fromsym_name, from_pretty_name_p,
-	     to_pretty_name, tosec, tosym_name, to_pretty_name_p);
-
-	if (!match(tosec, mismatch->bad_tosec) &&
-	    is_executable_section(elf, get_secindex(elf, sym)))
-		fprintf(stderr,
-			"The relocation at %s+0x%lx references\n"
-			"section \"%s\" which is not in the list of\n"
-			"authorized sections.  If you're adding a new section\n"
-			"and/or if this reference is valid, add \"%s\" to the\n"
-			"list of authorized sections to jump to on fault.\n"
-			"This can be achieved by adding \"%s\" to \n"
-			"OTHER_TEXT_SECTIONS in scripts/mod/modpost.c.\n",
-			fromsec, (long)r->r_offset, tosec, tosec, tosec);
-}
-
-static void extable_mismatch_handler(const char* modname, struct elf_info *elf,
-				     const struct sectioncheck* const mismatch,
-				     Elf_Rela* r, Elf_Sym* sym,
-				     const char *fromsec)
-{
-	const char* tosec = sec_name(elf, get_secindex(elf, sym));
+	s->is_func = (ELF_ST_TYPE(sym->st_info) == STT_FUNC);
 
-	sec_mismatch_count++;
+	/*
+	 * For parisc64, symbols prefixed $$ from the library have the symbol type
+	 * STT_LOPROC. They should be handled as functions too.
+	 */
+	if (elf->hdr->e_ident[EI_CLASS] == ELFCLASS64 &&
+	    elf->hdr->e_machine == EM_PARISC &&
+	    ELF_ST_TYPE(sym->st_info) == STT_LOPROC)
+		s->is_func = true;
 
-	report_extable_warnings(modname, elf, mismatch, r, sym, fromsec, tosec);
-
-	if (match(tosec, mismatch->bad_tosec))
-		fatal("The relocation at %s+0x%lx references\n"
-		      "section \"%s\" which is black-listed.\n"
-		      "Something is seriously wrong and should be fixed.\n"
-		      "You might get more information about where this is\n"
-		      "coming from by using scripts/check_extable.sh %s\n",
-		      fromsec, (long)r->r_offset, tosec, modname);
-	else if (!is_executable_section(elf, get_secindex(elf, sym))) {
-		if (is_extable_fault_address(r))
-			fatal("The relocation at %s+0x%lx references\n"
-			      "section \"%s\" which is not executable, IOW\n"
-			      "it is not possible for the kernel to fault\n"
-			      "at that address.  Something is seriously wrong\n"
-			      "and should be fixed.\n",
-			      fromsec, (long)r->r_offset, tosec);
-		else
-			fatal("The relocation at %s+0x%lx references\n"
-			      "section \"%s\" which is not executable, IOW\n"
-			      "the kernel will fault if it ever tries to\n"
-			      "jump to it.  Something is seriously wrong\n"
-			      "and should be fixed.\n",
-			      fromsec, (long)r->r_offset, tosec);
-	}
+	if (match(secname, PATTERNS(ALL_INIT_SECTIONS)))
+		warn("%s: %s: EXPORT_SYMBOL used for init symbol. Remove __init or EXPORT_SYMBOL.\n",
+		     mod->name, name);
+	else if (match(secname, PATTERNS(ALL_EXIT_SECTIONS)))
+		warn("%s: %s: EXPORT_SYMBOL used for exit symbol. Remove __exit or EXPORT_SYMBOL.\n",
+		     mod->name, name);
 }
 
-static void check_section_mismatch(const char *modname, struct elf_info *elf,
-				   Elf_Rela *r, Elf_Sym *sym, const char *fromsec)
+static void check_section_mismatch(struct module *mod, struct elf_info *elf,
+				   Elf_Sym *sym,
+				   unsigned int fsecndx, const char *fromsec,
+				   Elf_Addr faddr, Elf_Addr taddr)
 {
 	const char *tosec = sec_name(elf, get_secindex(elf, sym));
-	const struct sectioncheck *mismatch = section_mismatch(fromsec, tosec);
+	const struct sectioncheck *mismatch;
 
-	if (mismatch) {
-		if (mismatch->handler)
-			mismatch->handler(modname, elf,  mismatch,
-					  r, sym, fromsec);
-		else
-			default_mismatch_handler(modname, elf, mismatch,
-						 r, sym, fromsec);
+	if (module_enabled && elf->export_symbol_secndx == fsecndx) {
+		check_export_symbol(mod, elf, faddr, tosec, sym);
+		return;
 	}
-}
 
-static unsigned int *reloc_location(struct elf_info *elf,
-				    Elf_Shdr *sechdr, Elf_Rela *r)
-{
-	return sym_get_data_by_offset(elf, sechdr->sh_info, r->r_offset);
+	mismatch = section_mismatch(fromsec, tosec);
+	if (!mismatch)
+		return;
+
+	default_mismatch_handler(mod->name, elf, mismatch, sym,
+				 fsecndx, fromsec, faddr,
+				 tosec, taddr);
 }
 
-static int addend_386_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
+static Elf_Addr addend_386_rel(uint32_t *location, unsigned int r_type)
 {
-	unsigned int r_typ = ELF_R_TYPE(r->r_info);
-	unsigned int *location = reloc_location(elf, sechdr, r);
-
-	switch (r_typ) {
+	switch (r_type) {
 	case R_386_32:
-		r->r_addend = TO_NATIVE(*location);
-		break;
+		return get_unaligned_native(location);
 	case R_386_PC32:
-		r->r_addend = TO_NATIVE(*location) + 4;
-		break;
+		return get_unaligned_native(location) + 4;
 	}
-	return 0;
+
+	return (Elf_Addr)(-1);
 }
 
-#ifndef R_ARM_CALL
-#define R_ARM_CALL	28
-#endif
-#ifndef R_ARM_JUMP24
-#define R_ARM_JUMP24	29
-#endif
+static int32_t sign_extend32(int32_t value, int index)
+{
+	uint8_t shift = 31 - index;
 
-#ifndef	R_ARM_THM_CALL
-#define	R_ARM_THM_CALL		10
-#endif
-#ifndef	R_ARM_THM_JUMP24
-#define	R_ARM_THM_JUMP24	30
-#endif
-#ifndef	R_ARM_THM_JUMP19
-#define	R_ARM_THM_JUMP19	51
-#endif
+	return (int32_t)(value << shift) >> shift;
+}
 
-static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
+static Elf_Addr addend_arm_rel(void *loc, Elf_Sym *sym, unsigned int r_type)
 {
-	unsigned int r_typ = ELF_R_TYPE(r->r_info);
+	uint32_t inst, upper, lower, sign, j1, j2;
+	int32_t offset;
 
-	switch (r_typ) {
+	switch (r_type) {
 	case R_ARM_ABS32:
-		/* From ARM ABI: (S + A) | T */
-		r->r_addend = (int)(long)
-			      (elf->symtab_start + ELF_R_SYM(r->r_info));
-		break;
+	case R_ARM_REL32:
+		inst = get_unaligned_native((uint32_t *)loc);
+		return inst + sym->st_value;
+	case R_ARM_MOVW_ABS_NC:
+	case R_ARM_MOVT_ABS:
+		inst = get_unaligned_native((uint32_t *)loc);
+		offset = sign_extend32(((inst & 0xf0000) >> 4) | (inst & 0xfff),
+				       15);
+		return offset + sym->st_value;
 	case R_ARM_PC24:
 	case R_ARM_CALL:
 	case R_ARM_JUMP24:
-	case R_ARM_THM_CALL:
-	case R_ARM_THM_JUMP24:
+		inst = get_unaligned_native((uint32_t *)loc);
+		offset = sign_extend32((inst & 0x00ffffff) << 2, 25);
+		return offset + sym->st_value + 8;
+	case R_ARM_THM_MOVW_ABS_NC:
+	case R_ARM_THM_MOVT_ABS:
+		upper = get_unaligned_native((uint16_t *)loc);
+		lower = get_unaligned_native((uint16_t *)loc + 1);
+		offset = sign_extend32(((upper & 0x000f) << 12) |
+				       ((upper & 0x0400) << 1) |
+				       ((lower & 0x7000) >> 4) |
+				       (lower & 0x00ff),
+				       15);
+		return offset + sym->st_value;
 	case R_ARM_THM_JUMP19:
-		/* From ARM ABI: ((S + A) | T) - P */
-		r->r_addend = (int)(long)(elf->hdr +
-			      sechdr->sh_offset +
-			      (r->r_offset - sechdr->sh_addr));
-		break;
-	default:
-		return 1;
+		/*
+		 * Encoding T3:
+		 * S     = upper[10]
+		 * imm6  = upper[5:0]
+		 * J1    = lower[13]
+		 * J2    = lower[11]
+		 * imm11 = lower[10:0]
+		 * imm32 = SignExtend(S:J2:J1:imm6:imm11:'0')
+		 */
+		upper = get_unaligned_native((uint16_t *)loc);
+		lower = get_unaligned_native((uint16_t *)loc + 1);
+
+		sign = (upper >> 10) & 1;
+		j1 = (lower >> 13) & 1;
+		j2 = (lower >> 11) & 1;
+		offset = sign_extend32((sign << 20) | (j2 << 19) | (j1 << 18) |
+				       ((upper & 0x03f) << 12) |
+				       ((lower & 0x07ff) << 1),
+				       20);
+		return offset + sym->st_value + 4;
+	case R_ARM_THM_PC22:
+	case R_ARM_THM_JUMP24:
+		/*
+		 * Encoding T4:
+		 * S     = upper[10]
+		 * imm10 = upper[9:0]
+		 * J1    = lower[13]
+		 * J2    = lower[11]
+		 * imm11 = lower[10:0]
+		 * I1    = NOT(J1 XOR S)
+		 * I2    = NOT(J2 XOR S)
+		 * imm32 = SignExtend(S:I1:I2:imm10:imm11:'0')
+		 */
+		upper = get_unaligned_native((uint16_t *)loc);
+		lower = get_unaligned_native((uint16_t *)loc + 1);
+
+		sign = (upper >> 10) & 1;
+		j1 = (lower >> 13) & 1;
+		j2 = (lower >> 11) & 1;
+		offset = sign_extend32((sign << 24) |
+				       ((~(j1 ^ sign) & 1) << 23) |
+				       ((~(j2 ^ sign) & 1) << 22) |
+				       ((upper & 0x03ff) << 12) |
+				       ((lower & 0x07ff) << 1),
+				       24);
+		return offset + sym->st_value + 4;
 	}
-	return 0;
+
+	return (Elf_Addr)(-1);
 }
 
-static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
+static Elf_Addr addend_mips_rel(uint32_t *location, unsigned int r_type)
 {
-	unsigned int r_typ = ELF_R_TYPE(r->r_info);
-	unsigned int *location = reloc_location(elf, sechdr, r);
-	unsigned int inst;
+	uint32_t inst;
 
-	if (r_typ == R_MIPS_HI16)
-		return 1;	/* skip this */
-	inst = TO_NATIVE(*location);
-	switch (r_typ) {
+	inst = get_unaligned_native(location);
+	switch (r_type) {
 	case R_MIPS_LO16:
-		r->r_addend = inst & 0xffff;
-		break;
+		return inst & 0xffff;
 	case R_MIPS_26:
-		r->r_addend = (inst & 0x03ffffff) << 2;
-		break;
+		return (inst & 0x03ffffff) << 2;
 	case R_MIPS_32:
-		r->r_addend = inst;
-		break;
+		return inst;
 	}
-	return 0;
+	return (Elf_Addr)(-1);
 }
 
 #ifndef EM_RISCV
@@ -1529,119 +1295,120 @@ static int addend_mips_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
 #define R_LARCH_SUB32		55
 #endif
 
-static void section_rela(const char *modname, struct elf_info *elf,
-			 Elf_Shdr *sechdr)
+#ifndef R_LARCH_RELAX
+#define R_LARCH_RELAX		100
+#endif
+
+#ifndef R_LARCH_ALIGN
+#define R_LARCH_ALIGN		102
+#endif
+
+static void get_rel_type_and_sym(struct elf_info *elf, uint64_t r_info,
+				 unsigned int *r_type, unsigned int *r_sym)
 {
-	Elf_Sym  *sym;
-	Elf_Rela *rela;
-	Elf_Rela r;
-	unsigned int r_sym;
-	const char *fromsec;
+	typedef struct {
+		Elf64_Word    r_sym;	/* Symbol index */
+		unsigned char r_ssym;	/* Special symbol for 2nd relocation */
+		unsigned char r_type3;	/* 3rd relocation type */
+		unsigned char r_type2;	/* 2nd relocation type */
+		unsigned char r_type;	/* 1st relocation type */
+	} Elf64_Mips_R_Info;
+
+	bool is_64bit = (elf->hdr->e_ident[EI_CLASS] == ELFCLASS64);
 
-	Elf_Rela *start = (void *)elf->hdr + sechdr->sh_offset;
-	Elf_Rela *stop  = (void *)start + sechdr->sh_size;
+	if (elf->hdr->e_machine == EM_MIPS && is_64bit) {
+		Elf64_Mips_R_Info *mips64_r_info = (void *)&r_info;
 
-	fromsec = sec_name(elf, sechdr->sh_info);
-	/* if from section (name) is know good then skip it */
-	if (match(fromsec, section_white_list))
+		*r_type = mips64_r_info->r_type;
+		*r_sym = TO_NATIVE(mips64_r_info->r_sym);
 		return;
+	}
+
+	if (is_64bit)
+		r_info = TO_NATIVE((Elf64_Xword)r_info);
+	else
+		r_info = TO_NATIVE((Elf32_Word)r_info);
+
+	*r_type = ELF_R_TYPE(r_info);
+	*r_sym = ELF_R_SYM(r_info);
+}
+
+static void section_rela(struct module *mod, struct elf_info *elf,
+			 unsigned int fsecndx, const char *fromsec,
+			 const Elf_Rela *start, const Elf_Rela *stop)
+{
+	const Elf_Rela *rela;
 
 	for (rela = start; rela < stop; rela++) {
-		r.r_offset = TO_NATIVE(rela->r_offset);
-#if KERNEL_ELFCLASS == ELFCLASS64
-		if (elf->hdr->e_machine == EM_MIPS) {
-			unsigned int r_typ;
-			r_sym = ELF64_MIPS_R_SYM(rela->r_info);
-			r_sym = TO_NATIVE(r_sym);
-			r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
-			r.r_info = ELF64_R_INFO(r_sym, r_typ);
-		} else {
-			r.r_info = TO_NATIVE(rela->r_info);
-			r_sym = ELF_R_SYM(r.r_info);
-		}
-#else
-		r.r_info = TO_NATIVE(rela->r_info);
-		r_sym = ELF_R_SYM(r.r_info);
-#endif
-		r.r_addend = TO_NATIVE(rela->r_addend);
+		Elf_Sym *tsym;
+		Elf_Addr taddr, r_offset;
+		unsigned int r_type, r_sym;
+
+		r_offset = TO_NATIVE(rela->r_offset);
+		get_rel_type_and_sym(elf, rela->r_info, &r_type, &r_sym);
+
+		tsym = elf->symtab_start + r_sym;
+		taddr = tsym->st_value + TO_NATIVE(rela->r_addend);
+
 		switch (elf->hdr->e_machine) {
 		case EM_RISCV:
 			if (!strcmp("__ex_table", fromsec) &&
-			    ELF_R_TYPE(r.r_info) == R_RISCV_SUB32)
+			    r_type == R_RISCV_SUB32)
 				continue;
 			break;
 		case EM_LOONGARCH:
-			if (!strcmp("__ex_table", fromsec) &&
-			    ELF_R_TYPE(r.r_info) == R_LARCH_SUB32)
+			switch (r_type) {
+			case R_LARCH_SUB32:
+				if (!strcmp("__ex_table", fromsec))
+					continue;
+				break;
+			case R_LARCH_RELAX:
+			case R_LARCH_ALIGN:
+				/* These relocs do not refer to symbols */
 				continue;
+			}
 			break;
 		}
-		sym = elf->symtab_start + r_sym;
-		/* Skip special sections */
-		if (is_shndx_special(sym->st_shndx))
-			continue;
-		if (is_second_extable_reloc(start, rela, fromsec))
-			find_extable_entry_size(fromsec, &r);
-		check_section_mismatch(modname, elf, &r, sym, fromsec);
+
+		check_section_mismatch(mod, elf, tsym,
+				       fsecndx, fromsec, r_offset, taddr);
 	}
 }
 
-static void section_rel(const char *modname, struct elf_info *elf,
-			Elf_Shdr *sechdr)
+static void section_rel(struct module *mod, struct elf_info *elf,
+			unsigned int fsecndx, const char *fromsec,
+			const Elf_Rel *start, const Elf_Rel *stop)
 {
-	Elf_Sym *sym;
-	Elf_Rel *rel;
-	Elf_Rela r;
-	unsigned int r_sym;
-	const char *fromsec;
+	const Elf_Rel *rel;
 
-	Elf_Rel *start = (void *)elf->hdr + sechdr->sh_offset;
-	Elf_Rel *stop  = (void *)start + sechdr->sh_size;
+	for (rel = start; rel < stop; rel++) {
+		Elf_Sym *tsym;
+		Elf_Addr taddr, r_offset;
+		unsigned int r_type, r_sym;
+		void *loc;
 
-	fromsec = sec_name(elf, sechdr->sh_info);
-	/* if from section (name) is know good then skip it */
-	if (match(fromsec, section_white_list))
-		return;
+		r_offset = TO_NATIVE(rel->r_offset);
+		get_rel_type_and_sym(elf, rel->r_info, &r_type, &r_sym);
+
+		loc = sym_get_data_by_offset(elf, fsecndx, r_offset);
+		tsym = elf->symtab_start + r_sym;
 
-	for (rel = start; rel < stop; rel++) {
-		r.r_offset = TO_NATIVE(rel->r_offset);
-#if KERNEL_ELFCLASS == ELFCLASS64
-		if (elf->hdr->e_machine == EM_MIPS) {
-			unsigned int r_typ;
-			r_sym = ELF64_MIPS_R_SYM(rel->r_info);
-			r_sym = TO_NATIVE(r_sym);
-			r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
-			r.r_info = ELF64_R_INFO(r_sym, r_typ);
-		} else {
-			r.r_info = TO_NATIVE(rel->r_info);
-			r_sym = ELF_R_SYM(r.r_info);
-		}
-#else
-		r.r_info = TO_NATIVE(rel->r_info);
-		r_sym = ELF_R_SYM(r.r_info);
-#endif
-		r.r_addend = 0;
 		switch (elf->hdr->e_machine) {
 		case EM_386:
-			if (addend_386_rel(elf, sechdr, &r))
-				continue;
+			taddr = addend_386_rel(loc, r_type);
 			break;
 		case EM_ARM:
-			if (addend_arm_rel(elf, sechdr, &r))
-				continue;
+			taddr = addend_arm_rel(loc, tsym, r_type);
 			break;
 		case EM_MIPS:
-			if (addend_mips_rel(elf, sechdr, &r))
-				continue;
+			taddr = addend_mips_rel(loc, r_type);
 			break;
+		default:
+			fatal("Please add code to calculate addend for this architecture\n");
 		}
-		sym = elf->symtab_start + r_sym;
-		/* Skip special sections */
-		if (is_shndx_special(sym->st_shndx))
-			continue;
-		if (is_second_extable_reloc(start, rel, fromsec))
-			find_extable_entry_size(fromsec, &r);
-		check_section_mismatch(modname, elf, &r, sym, fromsec);
+
+		check_section_mismatch(mod, elf, tsym,
+				       fsecndx, fromsec, r_offset, taddr);
 	}
 }
 
@@ -1657,19 +1424,36 @@ static void section_rel(const char *modname, struct elf_info *elf,
  * to find all references to a section that reference a section that will
  * be discarded and warns about it.
  **/
-static void check_sec_ref(const char *modname, struct elf_info *elf)
+static void check_sec_ref(struct module *mod, struct elf_info *elf)
 {
 	int i;
-	Elf_Shdr *sechdrs = elf->sechdrs;
 
 	/* Walk through all sections */
 	for (i = 0; i < elf->num_sections; i++) {
-		check_section(modname, elf, &elf->sechdrs[i]);
+		Elf_Shdr *sechdr = &elf->sechdrs[i];
+
+		check_section(mod->name, elf, sechdr);
 		/* We want to process only relocation sections and not .init */
-		if (sechdrs[i].sh_type == SHT_RELA)
-			section_rela(modname, elf, &elf->sechdrs[i]);
-		else if (sechdrs[i].sh_type == SHT_REL)
-			section_rel(modname, elf, &elf->sechdrs[i]);
+		if (sechdr->sh_type == SHT_REL || sechdr->sh_type == SHT_RELA) {
+			/* section to which the relocation applies */
+			unsigned int secndx = sechdr->sh_info;
+			const char *secname = sec_name(elf, secndx);
+			const void *start, *stop;
+
+			/* If the section is known good, skip it */
+			if (match(secname, section_white_list))
+				continue;
+
+			start = sym_get_data_by_offset(elf, i, 0);
+			stop = start + sechdr->sh_size;
+
+			if (sechdr->sh_type == SHT_RELA)
+				section_rela(mod, elf, secndx, secname,
+					     start, stop);
+			else
+				section_rel(mod, elf, secndx, secname,
+					    start, stop);
+		}
 	}
 }
 
@@ -1696,14 +1480,8 @@ static void extract_crcs_for_object(const char *object, struct module *mod)
 	const char *base;
 	int dirlen, ret;
 
-	base = strrchr(object, '/');
-	if (base) {
-		base++;
-		dirlen = base - object;
-	} else {
-		dirlen = 0;
-		base = object;
-	}
+	base = get_basename(object);
+	dirlen = base - object;
 
 	ret = snprintf(cmd_file, sizeof(cmd_file), "%.*s.%s.cmd",
 		       dirlen, object, base);
@@ -1733,7 +1511,7 @@ static void extract_crcs_for_object(const char *object, struct module *mod)
 		if (!isdigit(*p))
 			continue;	/* skip this line */
 
-		crc = strtol(p, &p, 0);
+		crc = strtoul(p, &p, 0);
 		if (*p != '\n')
 			continue;	/* skip this line */
 
@@ -1804,6 +1582,14 @@ static void read_symbols(const char *modname)
 	/* strip trailing .o */
 	mod = new_module(modname, strlen(modname) - strlen(".o"));
 
+	/* save .no_trim_symbol section for later use */
+	if (info.no_trim_symbol_len) {
+		mod->no_trim_symbol = xmalloc(info.no_trim_symbol_len);
+		memcpy(mod->no_trim_symbol, info.no_trim_symbol,
+		       info.no_trim_symbol_len);
+		mod->no_trim_symbol_len = info.no_trim_symbol_len;
+	}
+
 	if (!mod->is_vmlinux) {
 		license = get_modinfo(&info, "license");
 		if (!license)
@@ -1816,12 +1602,18 @@ static void read_symbols(const char *modname)
 			license = get_next_modinfo(&info, "license", license);
 		}
 
-		namespace = get_modinfo(&info, "import_ns");
-		while (namespace) {
+		for (namespace = get_modinfo(&info, "import_ns");
+		     namespace;
+		     namespace = get_next_modinfo(&info, "import_ns", namespace)) {
+			if (strstarts(namespace, MODULE_NS_PREFIX))
+				error("%s: explicitly importing namespace \"%s\" is not allowed.\n",
+				      mod->name, namespace);
+
 			add_namespace(&mod->imported_namespaces, namespace);
-			namespace = get_next_modinfo(&info, "import_ns",
-						     namespace);
 		}
+
+		if (!get_modinfo(&info, "description"))
+			warn("missing MODULE_DESCRIPTION() in %s\n", modname);
 	}
 
 	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
@@ -1831,16 +1623,7 @@ static void read_symbols(const char *modname)
 		handle_moddevtable(mod, &info, sym, symname);
 	}
 
-	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
-		symname = remove_dot(info.strtab + sym->st_name);
-
-		/* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
-		if (strstarts(symname, "__kstrtabns_"))
-			sym_update_namespace(symname + strlen("__kstrtabns_"),
-					     sym_get_data(&info, sym));
-	}
-
-	check_sec_ref(modname, &info);
+	check_sec_ref(mod, &info);
 
 	if (!mod->is_vmlinux) {
 		version = get_modinfo(&info, "version");
@@ -1905,12 +1688,52 @@ void buf_write(struct buffer *buf, const char *s, int len)
 {
 	if (buf->size - buf->pos < len) {
 		buf->size += len + SZ;
-		buf->p = NOFAIL(realloc(buf->p, buf->size));
+		buf->p = xrealloc(buf->p, buf->size);
 	}
 	strncpy(buf->p + buf->pos, s, len);
 	buf->pos += len;
 }
 
+/**
+ * verify_module_namespace() - does @modname have access to this symbol's @namespace
+ * @namespace: export symbol namespace
+ * @modname: module name
+ *
+ * If @namespace is prefixed with "module:" to indicate it is a module namespace
+ * then test if @modname matches any of the comma separated patterns.
+ *
+ * The patterns only support tail-glob.
+ */
+static bool verify_module_namespace(const char *namespace, const char *modname)
+{
+	size_t len, modlen = strlen(modname);
+	const char *prefix = "module:";
+	const char *sep;
+	bool glob;
+
+	if (!strstarts(namespace, prefix))
+		return false;
+
+	for (namespace += strlen(prefix); *namespace; namespace = sep) {
+		sep = strchrnul(namespace, ',');
+		len = sep - namespace;
+
+		glob = false;
+		if (sep[-1] == '*') {
+			len--;
+			glob = true;
+		}
+
+		if (*sep)
+			sep++;
+
+		if (strncmp(namespace, modname, len) == 0 && (glob || len == modlen))
+			return true;
+	}
+
+	return false;
+}
+
 static void check_exports(struct module *mod)
 {
 	struct symbol *s, *exp;
@@ -1920,7 +1743,7 @@ static void check_exports(struct module *mod)
 		exp = find_symbol(s->name);
 		if (!exp) {
 			if (!s->weak && nr_unresolved++ < MAX_UNRESOLVED_REPORTS)
-				modpost_log(warn_unresolved ? LOG_WARN : LOG_ERROR,
+				modpost_log(!warn_unresolved,
 					    "\"%s\" [%s.ko] undefined!\n",
 					    s->name, mod->name);
 			continue;
@@ -1931,19 +1754,16 @@ static void check_exports(struct module *mod)
 			continue;
 		}
 
+		exp->used = true;
 		s->module = exp->module;
 		s->crc_valid = exp->crc_valid;
 		s->crc = exp->crc;
 
-		basename = strrchr(mod->name, '/');
-		if (basename)
-			basename++;
-		else
-			basename = mod->name;
+		basename = get_basename(mod->name);
 
-		if (exp->namespace &&
+		if (!verify_module_namespace(exp->namespace, basename) &&
 		    !contains_namespace(&mod->imported_namespaces, exp->namespace)) {
-			modpost_log(allow_missing_ns_imports ? LOG_WARN : LOG_ERROR,
+			modpost_log(!allow_missing_ns_imports,
 				    "module %s uses symbol %s from namespace %s, but does not import it.\n",
 				    basename, exp->name, exp->namespace);
 			add_namespace(&mod->missing_namespaces, exp->namespace);
@@ -1955,15 +1775,51 @@ static void check_exports(struct module *mod)
 	}
 }
 
+static void handle_white_list_exports(const char *white_list)
+{
+	char *buf, *p, *name;
+
+	buf = read_text_file(white_list);
+	p = buf;
+
+	while ((name = strsep(&p, "\n"))) {
+		struct symbol *sym = find_symbol(name);
+
+		if (sym)
+			sym->used = true;
+	}
+
+	free(buf);
+}
+
+/*
+ * Keep symbols recorded in the .no_trim_symbol section. This is necessary to
+ * prevent CONFIG_TRIM_UNUSED_KSYMS from dropping EXPORT_SYMBOL because
+ * symbol_get() relies on the symbol being present in the ksymtab for lookups.
+ */
+static void keep_no_trim_symbols(struct module *mod)
+{
+	unsigned long size = mod->no_trim_symbol_len;
+
+	for (char *s = mod->no_trim_symbol; s; s = next_string(s , &size)) {
+		struct symbol *sym;
+
+		/*
+		 * If find_symbol() returns NULL, this symbol is not provided
+		 * by any module, and symbol_get() will fail.
+		 */
+		sym = find_symbol(s);
+		if (sym)
+			sym->used = true;
+	}
+}
+
 static void check_modname_len(struct module *mod)
 {
 	const char *mod_name;
 
-	mod_name = strrchr(mod->name, '/');
-	if (mod_name == NULL)
-		mod_name = mod->name;
-	else
-		mod_name++;
+	mod_name = get_basename(mod->name);
+
 	if (strlen(mod_name) >= MODULE_NAME_LEN)
 		error("module name is too long [%s.ko]\n", mod->name);
 }
@@ -1974,21 +1830,9 @@ static void check_modname_len(struct module *mod)
 static void add_header(struct buffer *b, struct module *mod)
 {
 	buf_printf(b, "#include <linux/module.h>\n");
-	/*
-	 * Include build-salt.h after module.h in order to
-	 * inherit the definitions.
-	 */
-	buf_printf(b, "#define INCLUDE_VERMAGIC\n");
-	buf_printf(b, "#include <linux/build-salt.h>\n");
-	buf_printf(b, "#include <linux/elfnote-lto.h>\n");
 	buf_printf(b, "#include <linux/export-internal.h>\n");
-	buf_printf(b, "#include <linux/vermagic.h>\n");
 	buf_printf(b, "#include <linux/compiler.h>\n");
 	buf_printf(b, "\n");
-	buf_printf(b, "BUILD_SALT;\n");
-	buf_printf(b, "BUILD_LTO_INFO;\n");
-	buf_printf(b, "\n");
-	buf_printf(b, "MODULE_INFO(vermagic, VERMAGIC_STRING);\n");
 	buf_printf(b, "MODULE_INFO(name, KBUILD_MODNAME);\n");
 	buf_printf(b, "\n");
 	buf_printf(b, "__visible struct module __this_module\n");
@@ -2006,12 +1850,6 @@ static void add_header(struct buffer *b, struct module *mod)
 	if (!external_module)
 		buf_printf(b, "\nMODULE_INFO(intree, \"Y\");\n");
 
-	buf_printf(b,
-		   "\n"
-		   "#ifdef CONFIG_RETPOLINE\n"
-		   "MODULE_INFO(retpoline, \"Y\");\n"
-		   "#endif\n");
-
 	if (strstarts(mod->name, "drivers/staging"))
 		buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
 
@@ -2023,12 +1861,26 @@ static void add_exported_symbols(struct buffer *buf, struct module *mod)
 {
 	struct symbol *sym;
 
+	/* generate struct for exported symbols */
+	buf_printf(buf, "\n");
+	list_for_each_entry(sym, &mod->exported_symbols, list) {
+		if (trim_unused_exports && !sym->used)
+			continue;
+
+		buf_printf(buf, "KSYMTAB_%s(%s, \"%s\", \"%s\");\n",
+			   sym->is_func ? "FUNC" : "DATA", sym->name,
+			   sym->is_gpl_only ? "_gpl" : "", sym->namespace);
+	}
+
 	if (!modversions)
 		return;
 
 	/* record CRCs for exported symbols */
 	buf_printf(buf, "\n");
 	list_for_each_entry(sym, &mod->exported_symbols, list) {
+		if (trim_unused_exports && !sym->used)
+			continue;
+
 		if (!sym->crc_valid)
 			warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n"
 			     "Is \"%s\" prototyped in <asm/asm-prototypes.h>?\n",
@@ -2041,13 +1893,56 @@ static void add_exported_symbols(struct buffer *buf, struct module *mod)
 }
 
 /**
+ * Record CRCs for unresolved symbols, supporting long names
+ */
+static void add_extended_versions(struct buffer *b, struct module *mod)
+{
+	struct symbol *s;
+
+	if (!extended_modversions)
+		return;
+
+	buf_printf(b, "\n");
+	buf_printf(b, "static const u32 ____version_ext_crcs[]\n");
+	buf_printf(b, "__used __section(\"__version_ext_crcs\") = {\n");
+	list_for_each_entry(s, &mod->unresolved_symbols, list) {
+		if (!s->module)
+			continue;
+		if (!s->crc_valid) {
+			warn("\"%s\" [%s.ko] has no CRC!\n",
+				s->name, mod->name);
+			continue;
+		}
+		buf_printf(b, "\t0x%08x,\n", s->crc);
+	}
+	buf_printf(b, "};\n");
+
+	buf_printf(b, "static const char ____version_ext_names[]\n");
+	buf_printf(b, "__used __section(\"__version_ext_names\") =\n");
+	list_for_each_entry(s, &mod->unresolved_symbols, list) {
+		if (!s->module)
+			continue;
+		if (!s->crc_valid)
+			/*
+			 * We already warned on this when producing the crc
+			 * table.
+			 * We need to skip its name too, as the indexes in
+			 * both tables need to align.
+			 */
+			continue;
+		buf_printf(b, "\t\"%s\\0\"\n", s->name);
+	}
+	buf_printf(b, ";\n");
+}
+
+/**
  * Record CRCs for unresolved symbols
  **/
 static void add_versions(struct buffer *b, struct module *mod)
 {
 	struct symbol *s;
 
-	if (!modversions)
+	if (!basic_modversions)
 		return;
 
 	buf_printf(b, "\n");
@@ -2063,11 +1958,16 @@ static void add_versions(struct buffer *b, struct module *mod)
 			continue;
 		}
 		if (strlen(s->name) >= MODULE_NAME_LEN) {
-			error("too long symbol \"%s\" [%s.ko]\n",
-			      s->name, mod->name);
-			break;
+			if (extended_modversions) {
+				/* this symbol will only be in the extended info */
+				continue;
+			} else {
+				error("too long symbol \"%s\" [%s.ko]\n",
+				      s->name, mod->name);
+				break;
+			}
 		}
-		buf_printf(b, "\t{ %#8x, \"%s\" },\n",
+		buf_printf(b, "\t{ 0x%08x, \"%s\" },\n",
 			   s->crc, s->name);
 	}
 
@@ -2096,11 +1996,7 @@ static void add_depends(struct buffer *b, struct module *mod)
 			continue;
 
 		s->module->seen = true;
-		p = strrchr(s->module->name, '/');
-		if (p)
-			p++;
-		else
-			p = s->module->name;
+		p = get_basename(s->module->name);
 		buf_printf(b, "%s%s", first ? "" : ",", p);
 		first = 0;
 	}
@@ -2154,7 +2050,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
 	if (st.st_size != b->pos)
 		goto close_write;
 
-	tmp = NOFAIL(malloc(b->pos));
+	tmp = xmalloc(b->pos);
 	if (fread(tmp, 1, b->pos, file) != b->pos)
 		goto free_write;
 
@@ -2176,11 +2072,26 @@ static void write_if_changed(struct buffer *b, const char *fname)
 static void write_vmlinux_export_c_file(struct module *mod)
 {
 	struct buffer buf = { };
+	struct module_alias *alias, *next;
 
 	buf_printf(&buf,
 		   "#include <linux/export-internal.h>\n");
 
 	add_exported_symbols(&buf, mod);
+
+	buf_printf(&buf,
+		   "#include <linux/module.h>\n"
+		   "#undef __MODULE_INFO_PREFIX\n"
+		   "#define __MODULE_INFO_PREFIX\n");
+
+	list_for_each_entry_safe(alias, next, &mod->aliases, node) {
+		buf_printf(&buf, "MODULE_INFO(%s.alias, \"%s\");\n",
+			   alias->builtin_modname, alias->str);
+		list_del(&alias->node);
+		free(alias->builtin_modname);
+		free(alias);
+	}
+
 	write_if_changed(&buf, ".vmlinux.export.c");
 	free(buf.p);
 }
@@ -2189,17 +2100,23 @@ static void write_vmlinux_export_c_file(struct module *mod)
 static void write_mod_c_file(struct module *mod)
 {
 	struct buffer buf = { };
+	struct module_alias *alias, *next;
 	char fname[PATH_MAX];
 	int ret;
 
-	check_modname_len(mod);
-	check_exports(mod);
-
 	add_header(&buf, mod);
 	add_exported_symbols(&buf, mod);
 	add_versions(&buf, mod);
+	add_extended_versions(&buf, mod);
 	add_depends(&buf, mod);
-	add_moddevtable(&buf, mod);
+
+	buf_printf(&buf, "\n");
+	list_for_each_entry_safe(alias, next, &mod->aliases, node) {
+		buf_printf(&buf, "MODULE_ALIAS(\"%s\");\n", alias->str);
+		list_del(&alias->node);
+		free(alias);
+	}
+
 	add_srcversion(&buf, mod);
 
 	ret = snprintf(fname, sizeof(fname), "%s.mod.c", mod->name);
@@ -2261,14 +2178,13 @@ static void read_dump(const char *fname)
 			continue;
 		}
 
-		mod = find_module(modname);
+		mod = find_module(fname, modname);
 		if (!mod) {
 			mod = new_module(modname, strlen(modname));
-			mod->from_dump = true;
+			mod->dump_file = fname;
 		}
-		s = sym_add_exported(symname, mod, gpl_only);
+		s = sym_add_exported(symname, mod, gpl_only, namespace);
 		sym_set_crc(s, crc);
-		sym_update_namespace(symname, namespace);
 	}
 	free(buf);
 	return;
@@ -2284,13 +2200,16 @@ static void write_dump(const char *fname)
 	struct symbol *sym;
 
 	list_for_each_entry(mod, &modules, list) {
-		if (mod->from_dump)
+		if (mod->dump_file)
 			continue;
 		list_for_each_entry(sym, &mod->exported_symbols, list) {
+			if (trim_unused_exports && !sym->used)
+				continue;
+
 			buf_printf(&buf, "0x%08x\t%s\t%s\tEXPORT_SYMBOL%s\t%s\n",
 				   sym->crc, sym->name, mod->name,
 				   sym->is_gpl_only ? "_GPL" : "",
-				   sym->namespace ?: "");
+				   sym->namespace);
 		}
 	}
 	write_buf(&buf, fname);
@@ -2305,7 +2224,7 @@ static void write_namespace_deps_files(const char *fname)
 
 	list_for_each_entry(mod, &modules, list) {
 
-		if (mod->from_dump || list_empty(&mod->missing_namespaces))
+		if (mod->dump_file || list_empty(&mod->missing_namespaces))
 			continue;
 
 		buf_printf(&ns_deps_buf, "%s.ko:", mod->name);
@@ -2325,25 +2244,48 @@ struct dump_list {
 	const char *file;
 };
 
+static void check_host_endian(void)
+{
+	static const union {
+		short s;
+		char c[2];
+	} endian_test = { .c = {0x01, 0x02} };
+
+	switch (endian_test.s) {
+	case 0x0102:
+		host_is_big_endian = true;
+		break;
+	case 0x0201:
+		host_is_big_endian = false;
+		break;
+	default:
+		fatal("Unknown host endian\n");
+	}
+}
+
 int main(int argc, char **argv)
 {
 	struct module *mod;
 	char *missing_namespace_deps = NULL;
+	char *unused_exports_white_list = NULL;
 	char *dump_write = NULL, *files_source = NULL;
 	int opt;
 	LIST_HEAD(dump_lists);
 	struct dump_list *dl, *dl2;
 
-	while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
+	while ((opt = getopt(argc, argv, "ei:MmnT:to:au:WwENd:xb")) != -1) {
 		switch (opt) {
 		case 'e':
 			external_module = true;
 			break;
 		case 'i':
-			dl = NOFAIL(malloc(sizeof(*dl)));
+			dl = xmalloc(sizeof(*dl));
 			dl->file = optarg;
 			list_add_tail(&dl->list, &dump_lists);
 			break;
+		case 'M':
+			module_enabled = true;
+			break;
 		case 'm':
 			modversions = true;
 			break;
@@ -2359,6 +2301,15 @@ int main(int argc, char **argv)
 		case 'T':
 			files_source = optarg;
 			break;
+		case 't':
+			trim_unused_exports = true;
+			break;
+		case 'u':
+			unused_exports_white_list = optarg;
+			break;
+		case 'W':
+			extra_warn = true;
+			break;
 		case 'w':
 			warn_unresolved = true;
 			break;
@@ -2371,11 +2322,19 @@ int main(int argc, char **argv)
 		case 'd':
 			missing_namespace_deps = optarg;
 			break;
+		case 'b':
+			basic_modversions = true;
+			break;
+		case 'x':
+			extended_modversions = true;
+			break;
 		default:
 			exit(1);
 		}
 	}
 
+	check_host_endian();
+
 	list_for_each_entry_safe(dl, dl2, &dump_lists, list) {
 		read_dump(dl->file);
 		list_del(&dl->list);
@@ -2389,7 +2348,20 @@ int main(int argc, char **argv)
 		read_symbols_from_files(files_source);
 
 	list_for_each_entry(mod, &modules, list) {
-		if (mod->from_dump)
+		keep_no_trim_symbols(mod);
+
+		if (mod->dump_file || mod->is_vmlinux)
+			continue;
+
+		check_modname_len(mod);
+		check_exports(mod);
+	}
+
+	if (unused_exports_white_list)
+		handle_white_list_exports(unused_exports_white_list);
+
+	list_for_each_entry(mod, &modules, list) {
+		if (mod->dump_file)
 			continue;
 
 		if (mod->is_vmlinux)