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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>
This commit is contained in:
Chris Metcalf 2010-05-24 14:32:53 -07:00 committed by Linus Torvalds
parent 4eaf3f6439
commit c6f6b596a5
1 changed files with 2 additions and 1 deletions
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3
include/linux/mm.h
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@ -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)