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authorLinus Torvalds <torvalds@linux-foundation.org>2022-10-10 12:00:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-10-10 12:00:45 -0700
commit8afc66e8d43be8edcf442165b70d50dd33091e68 (patch)
tree7e39a0a1f32b0d46acdac06c6ec515402ac9f583 /init
parent4de65c5830233e7a4adf2e679510089ec4e210c7 (diff)
parent0715fdb03e2c4f5748d245a231e422602ed29f33 (diff)
Merge tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada: - Remove potentially incomplete targets when Kbuid is interrupted by SIGINT etc in case GNU Make may miss to do that when stderr is piped to another program. - Rewrite the single target build so it works more correctly. - Fix rpm-pkg builds with V=1. - List top-level subdirectories in ./Kbuild. - Ignore auto-generated __kstrtab_* and __kstrtabns_* symbols in kallsyms. - Avoid two different modules in lib/zstd/ having shared code, which potentially causes building the common code as build-in and modular back-and-forth. - Unify two modpost invocations to optimize the build process. - Remove head-y syntax in favor of linker scripts for placing particular sections in the head of vmlinux. - Bump the minimal GNU Make version to 3.82. - Clean up misc Makefiles and scripts. * tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (41 commits) docs: bump minimal GNU Make version to 3.82 ia64: simplify esi object addition in Makefile Revert "kbuild: Check if linker supports the -X option" kbuild: rebuild .vmlinux.export.o when its prerequisite is updated kbuild: move modules.builtin(.modinfo) rules to Makefile.vmlinux_o zstd: Fixing mixed module-builtin objects kallsyms: ignore __kstrtab_* and __kstrtabns_* symbols kallsyms: take the input file instead of reading stdin kallsyms: drop duplicated ignore patterns from kallsyms.c kbuild: reuse mksysmap output for kallsyms mksysmap: update comment about __crc_* kbuild: remove head-y syntax kbuild: use obj-y instead extra-y for objects placed at the head kbuild: hide error checker logs for V=1 builds kbuild: re-run modpost when it is updated kbuild: unify two modpost invocations kbuild: move vmlinux.o rule to the top Makefile kbuild: move .vmlinux.objs rule to Makefile.modpost kbuild: list sub-directories in ./Kbuild Makefile.compiler: replace cc-ifversion with compiler-specific macros ...
Diffstat (limited to 'init')
-rw-r--r--init/.gitignore2
-rw-r--r--init/Makefile57
-rwxr-xr-xinit/build-version10
-rw-r--r--init/version-timestamp.c31
-rw-r--r--init/version.c37
5 files changed, 96 insertions, 41 deletions
diff --git a/init/.gitignore b/init/.gitignore
new file mode 100644
index 000000000000..cbbe270cec00
--- /dev/null
+++ b/init/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/utsversion-tmp.h
diff --git a/init/Makefile b/init/Makefile
index d82623d7fc8e..8316c23bead2 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -19,20 +19,43 @@ mounts-y := do_mounts.o
mounts-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
mounts-$(CONFIG_BLK_DEV_INITRD) += do_mounts_initrd.o
-# dependencies on generated files need to be listed explicitly
-$(obj)/version.o: include/generated/compile.h
-
-# compile.h changes depending on hostname, generation number, etc,
-# so we regenerate it always.
-# mkcompile_h will make sure to only update the
-# actual file if its content has changed.
-
-quiet_cmd_compile.h = CHK $@
- cmd_compile.h = \
- $(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
- "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT_BUILD)" \
- "$(CONFIG_PREEMPT_DYNAMIC)" "$(CONFIG_PREEMPT_RT)" \
- "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
-
-include/generated/compile.h: FORCE
- $(call cmd,compile.h)
+#
+# UTS_VERSION
+#
+
+smp-flag-$(CONFIG_SMP) := SMP
+preempt-flag-$(CONFIG_PREEMPT_BUILD) := PREEMPT
+preempt-flag-$(CONFIG_PREEMPT_DYNAMIC) := PREEMPT_DYNAMIC
+preempt-flag-$(CONFIG_PREEMPT_RT) := PREEMPT_RT
+
+build-version = $(or $(KBUILD_BUILD_VERSION), $(build-version-auto))
+build-timestamp = $(or $(KBUILD_BUILD_TIMESTAMP), $(build-timestamp-auto))
+
+# Maximum length of UTS_VERSION is 64 chars
+filechk_uts_version = \
+ utsver=$$(echo '$(pound)'"$(build-version)" $(smp-flag-y) $(preempt-flag-y) "$(build-timestamp)" | cut -b -64); \
+ echo '$(pound)'define UTS_VERSION \""$${utsver}"\"
+
+#
+# Build version.c with temporary UTS_VERSION
+#
+
+$(obj)/utsversion-tmp.h: FORCE
+ $(call filechk,uts_version)
+
+clean-files += utsversion-tmp.h
+
+$(obj)/version.o: $(obj)/utsversion-tmp.h
+CFLAGS_version.o := -include $(obj)/utsversion-tmp.h
+
+#
+# Build version-timestamp.c with final UTS_VERSION
+#
+
+include/generated/utsversion.h: build-version-auto = $(shell $(srctree)/$(src)/build-version)
+include/generated/utsversion.h: build-timestamp-auto = $(shell LC_ALL=C date)
+include/generated/utsversion.h: FORCE
+ $(call filechk,uts_version)
+
+$(obj)/version-timestamp.o: include/generated/utsversion.h
+CFLAGS_version-timestamp.o := -include include/generated/utsversion.h
diff --git a/init/build-version b/init/build-version
new file mode 100755
index 000000000000..537d45815083
--- /dev/null
+++ b/init/build-version
@@ -0,0 +1,10 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+prev_ver=$(cat .version 2>/dev/null) &&
+ver=$(expr ${prev_ver} + 1 2>/dev/null) ||
+ver=1
+
+echo ${ver} > .version
+
+echo ${ver}
diff --git a/init/version-timestamp.c b/init/version-timestamp.c
new file mode 100644
index 000000000000..179e93bae539
--- /dev/null
+++ b/init/version-timestamp.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <generated/compile.h>
+#include <generated/utsrelease.h>
+#include <linux/version.h>
+#include <linux/proc_ns.h>
+#include <linux/refcount.h>
+#include <linux/uts.h>
+#include <linux/utsname.h>
+
+struct uts_namespace init_uts_ns = {
+ .ns.count = REFCOUNT_INIT(2),
+ .name = {
+ .sysname = UTS_SYSNAME,
+ .nodename = UTS_NODENAME,
+ .release = UTS_RELEASE,
+ .version = UTS_VERSION,
+ .machine = UTS_MACHINE,
+ .domainname = UTS_DOMAINNAME,
+ },
+ .user_ns = &init_user_ns,
+ .ns.inum = PROC_UTS_INIT_INO,
+#ifdef CONFIG_UTS_NS
+ .ns.ops = &utsns_operations,
+#endif
+};
+
+/* FIXED STRINGS! Don't touch! */
+const char linux_banner[] =
+ "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
+ LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
diff --git a/init/version.c b/init/version.c
index b7f9559d417c..01d4ab05f0ba 100644
--- a/init/version.c
+++ b/init/version.c
@@ -16,27 +16,8 @@
#include <linux/uts.h>
#include <linux/utsname.h>
#include <generated/utsrelease.h>
-#include <linux/version.h>
#include <linux/proc_ns.h>
-struct uts_namespace init_uts_ns = {
- .ns.count = REFCOUNT_INIT(2),
- .name = {
- .sysname = UTS_SYSNAME,
- .nodename = UTS_NODENAME,
- .release = UTS_RELEASE,
- .version = UTS_VERSION,
- .machine = UTS_MACHINE,
- .domainname = UTS_DOMAINNAME,
- },
- .user_ns = &init_user_ns,
- .ns.inum = PROC_UTS_INIT_INO,
-#ifdef CONFIG_UTS_NS
- .ns.ops = &utsns_operations,
-#endif
-};
-EXPORT_SYMBOL_GPL(init_uts_ns);
-
static int __init early_hostname(char *arg)
{
size_t bufsize = sizeof(init_uts_ns.name.nodename);
@@ -52,11 +33,6 @@ static int __init early_hostname(char *arg)
}
early_param("hostname", early_hostname);
-/* FIXED STRINGS! Don't touch! */
-const char linux_banner[] =
- "Linux version " UTS_RELEASE " (" LINUX_COMPILE_BY "@"
- LINUX_COMPILE_HOST ") (" LINUX_COMPILER ") " UTS_VERSION "\n";
-
const char linux_proc_banner[] =
"%s version %s"
" (" LINUX_COMPILE_BY "@" LINUX_COMPILE_HOST ")"
@@ -64,3 +40,16 @@ const char linux_proc_banner[] =
BUILD_SALT;
BUILD_LTO_INFO;
+
+/*
+ * init_uts_ns and linux_banner contain the build version and timestamp,
+ * which are really fixed at the very last step of build process.
+ * They are compiled with __weak first, and without __weak later.
+ */
+
+struct uts_namespace init_uts_ns __weak;
+const char linux_banner[] __weak;
+
+#include "version-timestamp.c"
+
+EXPORT_SYMBOL_GPL(init_uts_ns);