diff options
| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2012-12-12 13:52:36 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 17:38:35 -0800 |
| commit | 816422ad76474fed8052b6f7b905a054d082e59a (patch) | |
| tree | 9918f68e9c5f93be98940b4b7b478e1637547926 /include/asm-generic | |
| parent | mm/hugetlb.c: fix warning on freeing hwpoisoned hugepage (diff) | |
| download | linux-dev-816422ad76474fed8052b6f7b905a054d082e59a.tar.xz linux-dev-816422ad76474fed8052b6f7b905a054d082e59a.zip | |
asm-generic, mm: pgtable: consolidate zero page helpers
We have two different implementation of is_zero_pfn() and my_zero_pfn()
helpers: for architectures with and without zero page coloring.
Let's consolidate them in <asm-generic/pgtable.h>.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/pgtable.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index b36ce40bd1c6..284e80831d2c 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -449,6 +449,32 @@ extern void untrack_pfn(struct vm_area_struct *vma, unsigned long pfn, unsigned long size); #endif +#ifdef __HAVE_COLOR_ZERO_PAGE +static inline int is_zero_pfn(unsigned long pfn) +{ + extern unsigned long zero_pfn; + unsigned long offset_from_zero_pfn = pfn - zero_pfn; + return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT); +} + +static inline unsigned long my_zero_pfn(unsigned long addr) +{ + return page_to_pfn(ZERO_PAGE(addr)); +} +#else +static inline int is_zero_pfn(unsigned long pfn) +{ + extern unsigned long zero_pfn; + return pfn == zero_pfn; +} + +static inline unsigned long my_zero_pfn(unsigned long addr) +{ + extern unsigned long zero_pfn; + return zero_pfn; +} +#endif + #ifdef CONFIG_MMU #ifndef CONFIG_TRANSPARENT_HUGEPAGE |