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Commit c6f6b596 authored by Chris Metcalf's avatar Chris Metcalf Committed by Linus Torvalds
Browse files

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: default avatarChris Metcalf <cmetcalf@tilera.com>
Cc: Barry Song <21cnbao@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 4eaf3f64

include/linux/mm.h

+2 −1
Original line number Original line Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/debug_locks.h>

#include <linux/debug_locks.h>

#include <linux/mm_types.h>

#include <linux/mm_types.h>

#include <linux/range.h>

#include <linux/range.h>

#include <linux/pfn.h>





struct mempolicy;

struct mempolicy;

struct anon_vma;

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)

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)

#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL)