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mm: make HASHED_PAGE_VIRTUAL page_address' struct page argument const.

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Followup to 33dd4e0ec9 "mm: make some struct page's const" which missed the
HASHED_PAGE_VIRTUAL case.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ian Campbell 2011-08-17 13:45:09 +01:00 committed by Linus Torvalds
parent 72ed62bdc4
commit f991879473
3 changed files with 4 additions and 4 deletions
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2
include/linux/hash.h
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@ -63,7 +63,7 @@ static inline u32 hash_32(u32 val, unsigned int bits)
return hash >> (32 - bits); return hash >> (32 - bits);
} }
static inline unsigned long hash_ptr(void *ptr, unsigned int bits) static inline unsigned long hash_ptr(const void *ptr, unsigned int bits)
{ {
return hash_long((unsigned long)ptr, bits); return hash_long((unsigned long)ptr, bits);
} }

2
include/linux/mm.h
View file

@ -737,7 +737,7 @@ static __always_inline void *lowmem_page_address(const struct page *page)
#endif #endif
#if defined(HASHED_PAGE_VIRTUAL) #if defined(HASHED_PAGE_VIRTUAL)
void *page_address(struct page *page); void *page_address(const struct page *page);
void set_page_address(struct page *page, void *virtual); void set_page_address(struct page *page, void *virtual);
void page_address_init(void); void page_address_init(void);
#endif #endif

4
mm/highmem.c
View file

@ -326,7 +326,7 @@ static struct page_address_slot {
spinlock_t lock; /* Protect this bucket's list */ spinlock_t lock; /* Protect this bucket's list */
} ____cacheline_aligned_in_smp page_address_htable[1<<PA_HASH_ORDER]; } ____cacheline_aligned_in_smp page_address_htable[1<<PA_HASH_ORDER];
static struct page_address_slot *page_slot(struct page *page) static struct page_address_slot *page_slot(const struct page *page)
{ {
return &page_address_htable[hash_ptr(page, PA_HASH_ORDER)]; return &page_address_htable[hash_ptr(page, PA_HASH_ORDER)];
} }
@ -337,7 +337,7 @@ static struct page_address_slot *page_slot(struct page *page)
* *
* Returns the page's virtual address. * Returns the page's virtual address.
*/ */
void *page_address(struct page *page) void *page_address(const struct page *page)
{ {
unsigned long flags; unsigned long flags;
void *ret; void *ret;