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| author | Andi Kleen <andi@firstfloor.org> | 2008-03-12 03:53:27 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-04-17 17:41:30 +0200 |
| commit | 7d1116a92d709c22e7db910724c9fcd2001b0499 (patch) | |
| tree | 364fe750182fd5b8e53f14c64aed490388f6c5e6 | |
| parent | 41bd4eac748f39d7f3ed770fae3e595a747172bd (diff) | |
| download | linux-stable-7d1116a92d709c22e7db910724c9fcd2001b0499.tar.gz linux-stable-7d1116a92d709c22e7db910724c9fcd2001b0499.tar.bz2 linux-stable-7d1116a92d709c22e7db910724c9fcd2001b0499.zip | |
x86: implement true end_pfn_mapped for 32bit
Even on 32bit 2MB pages can map more memory than is in the true
max_low_pfn if end_pfn is not highmem and not aligned to 2MB.
Add a end_pfn_map similar to x86-64 that accounts for this
fact. This is important for code that really needs to know about
all mapping aliases.
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: andreas.herrmann3@amd.com
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/mm/init_32.c | 4 | ||||
| -rw-r--r-- | include/asm-x86/page.h | 4 | ||||
| -rw-r--r-- | include/asm-x86/page_64.h | 1 |
3 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 00168e65688a..73dd0601166a 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -51,6 +51,8 @@ unsigned int __VMALLOC_RESERVE = 128 << 20; +unsigned long end_pfn_map; + DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); unsigned long highstart_pfn, highend_pfn; @@ -194,6 +196,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base) set_pmd(pmd, pfn_pmd(pfn, prot)); pfn += PTRS_PER_PTE; + end_pfn_map = pfn; continue; } pte = one_page_table_init(pmd); @@ -208,6 +211,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base) set_pte(pte, pfn_pte(pfn, prot)); } + end_pfn_map = pfn; } } } diff --git a/include/asm-x86/page.h b/include/asm-x86/page.h index a05b2896492f..b734939916c4 100644 --- a/include/asm-x86/page.h +++ b/include/asm-x86/page.h @@ -36,7 +36,7 @@ #define max_pfn_mapped end_pfn_map #else #include <asm/page_32.h> -#define max_pfn_mapped max_low_pfn +#define max_pfn_mapped end_pfn_map #endif /* CONFIG_X86_64 */ #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET) @@ -50,6 +50,8 @@ extern int page_is_ram(unsigned long pagenr); +extern unsigned long end_pfn_map; + struct page; static inline void clear_user_page(void *page, unsigned long vaddr, diff --git a/include/asm-x86/page_64.h b/include/asm-x86/page_64.h index f156778f707c..54d5db634858 100644 --- a/include/asm-x86/page_64.h +++ b/include/asm-x86/page_64.h @@ -59,7 +59,6 @@ void clear_page(void *page); void copy_page(void *to, void *from); extern unsigned long end_pfn; -extern unsigned long end_pfn_map; extern unsigned long phys_base; extern unsigned long __phys_addr(unsigned long); |