1 files changed, 12 insertions, 46 deletions

diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
index bfab55675c16..b612cc57a4d3 100644
--- a/arch/x86/include/asm/pgtable_32.h
+++ b/arch/x86/include/asm/pgtable_32.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_X86_PGTABLE_32_H
 #define _ASM_X86_PGTABLE_32_H
 
@@ -12,7 +13,7 @@
  * This file contains the functions and defines necessary to modify and use
  * the i386 page table tree.
  */
-#ifndef __ASSEMBLY__
+#ifndef __ASSEMBLER__
 #include <asm/processor.h>
 #include <linux/threads.h>
 #include <asm/paravirt.h>
@@ -28,16 +29,8 @@ extern pgd_t swapper_pg_dir[1024];
 extern pgd_t initial_page_table[1024];
 extern pmd_t initial_pg_pmd[];
 
-static inline void pgtable_cache_init(void) { }
-static inline void check_pgt_cache(void) { }
 void paging_init(void);
-
-/*
- * Define this if things work differently on an i386 and an i486:
- * it will (on an i486) warn about kernel memory accesses that are
- * done without a 'access_ok(VERIFY_WRITE,..)'
- */
-#undef TEST_ACCESS_OK
+void sync_initial_page_table(void);
 
 #ifdef CONFIG_X86_PAE
 # include <asm/pgtable-3level.h>
@@ -45,50 +38,23 @@ void paging_init(void);
 # include <asm/pgtable-2level.h>
 #endif
 
-#if defined(CONFIG_HIGHPTE)
-#define pte_offset_map(dir, address)					\
-	((pte_t *)kmap_atomic(pmd_page(*(dir))) +		\
-	 pte_index((address)))
-#define pte_unmap(pte) kunmap_atomic((pte))
-#else
-#define pte_offset_map(dir, address)					\
-	((pte_t *)page_address(pmd_page(*(dir))) + pte_index((address)))
-#define pte_unmap(pte) do { } while (0)
-#endif
-
 /* Clear a kernel PTE and flush it from the TLB */
 #define kpte_clear_flush(ptep, vaddr)		\
 do {						\
 	pte_clear(&init_mm, (vaddr), (ptep));	\
-	__flush_tlb_one((vaddr));		\
+	flush_tlb_one_kernel((vaddr));		\
 } while (0)
 
-#endif /* !__ASSEMBLY__ */
+#endif /* !__ASSEMBLER__ */
 
 /*
- * kern_addr_valid() is (1) for FLATMEM and (0) for
- * SPARSEMEM and DISCONTIGMEM
- */
-#ifdef CONFIG_FLATMEM
-#define kern_addr_valid(addr)	(1)
-#else
-#define kern_addr_valid(kaddr)	(0)
-#endif
-
-/*
- * This is how much memory in addition to the memory covered up to
- * and including _end we need mapped initially.
- * We need:
- *     (KERNEL_IMAGE_SIZE/4096) / 1024 pages (worst case, non PAE)
- *     (KERNEL_IMAGE_SIZE/4096) / 512 + 4 pages (worst case for PAE)
- *
- * Modulo rounding, each megabyte assigned here requires a kilobyte of
- * memory, which is currently unreclaimed.
- *
- * This should be a multiple of a page.
+ * This is used to calculate the .brk reservation for initial pagetables.
+ * Enough space is reserved to allocate pagetables sufficient to cover all
+ * of LOWMEM_PAGES, which is an upper bound on the size of the direct map of
+ * lowmem.
  *
- * KERNEL_IMAGE_SIZE should be greater than pa(_end)
- * and small than max_low_pfn, otherwise will waste some page table entries
+ * With PAE paging (PTRS_PER_PMD > 1), we allocate PTRS_PER_PGD == 4 pages for
+ * the PMD's in addition to the pages required for the last level pagetables.
  */
 #if PTRS_PER_PMD > 1
 #define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD)
@@ -104,6 +70,6 @@ do {						\
  * with only a host target support using a 32-bit type for internal
  * representation.
  */
-#define LOWMEM_PAGES ((((2<<31) - __PAGE_OFFSET) >> PAGE_SHIFT))
+#define LOWMEM_PAGES ((((_ULL(2)<<31) - __PAGE_OFFSET) >> PAGE_SHIFT))
 
 #endif /* _ASM_X86_PGTABLE_32_H */