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| author | Chris Metcalf <cmetcalf@tilera.com> | 2010-05-24 14:32:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-25 08:07:02 -0700 |
| commit | c6f6b596a5a73e63e5e930c414375c0c389199ab (patch) | |
| tree | 900d4b3a6d198edc2045511b5b8d6001755bcfbf | |
| parent | 4eaf3f64397c3db3c5785eee508270d62a9fabd9 (diff) | |
| download | lwn-c6f6b596a5a73e63e5e930c414375c0c389199ab.tar.gz lwn-c6f6b596a5a73e63e5e930c414375c0c389199ab.zip | |
mm: make lowmem_page_address() use PFN_PHYS() for improved portability
This ensures that platforms with lowmem PAs above 32 bits work correctly
by avoiding truncating the PA during a left shift.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Cc: Barry Song <21cnbao@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/mm.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 963f908af9d0..b969efb03787 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -13,6 +13,7 @@ #include <linux/debug_locks.h> #include <linux/mm_types.h> #include <linux/range.h> +#include <linux/pfn.h> struct mempolicy; struct anon_vma; @@ -595,7 +596,7 @@ static inline void set_page_links(struct page *page, enum zone_type zone, static __always_inline void *lowmem_page_address(struct page *page) { - return __va(page_to_pfn(page) << PAGE_SHIFT); + return __va(PFN_PHYS(page_to_pfn(page))); } #if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) |