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mm: constify get_pfnblock_flags_mask and get_pfnblock_migratetype 

The struct page is not modified by these routines, so it can be marked
const.

Link: https://lkml.kernel.org/r/20210416231531.2521383-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-06-28 19:41:22 -07:00 committed by Linus Torvalds
parent 0f2317e34e
commit ca891f41c4
2 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/pageblock-flags.h
View File

@ -54,7 +54,7 @@ extern unsigned int pageblock_order;
/* Forward declaration */
struct page;
unsigned long get_pfnblock_flags_mask(struct page *page,
unsigned long get_pfnblock_flags_mask(const struct page *page,
unsigned long pfn,
unsigned long mask);

13
mm/page_alloc.c
View File

@ -474,7 +474,7 @@ static inline bool defer_init(int nid, unsigned long pfn, unsigned long end_pfn)
#endif
/* Return a pointer to the bitmap storing bits affecting a block of pages */
static inline unsigned long *get_pageblock_bitmap(struct page *page,
static inline unsigned long *get_pageblock_bitmap(const struct page *page,
unsigned long pfn)
{
#ifdef CONFIG_SPARSEMEM
@ -484,7 +484,7 @@ static inline unsigned long *get_pageblock_bitmap(struct page *page,
#endif /* CONFIG_SPARSEMEM */
}
static inline int pfn_to_bitidx(struct page *page, unsigned long pfn)
static inline int pfn_to_bitidx(const struct page *page, unsigned long pfn)
{
#ifdef CONFIG_SPARSEMEM
pfn &= (PAGES_PER_SECTION-1);
@ -495,7 +495,7 @@ static inline int pfn_to_bitidx(struct page *page, unsigned long pfn)
}
static __always_inline
unsigned long __get_pfnblock_flags_mask(struct page *page,
unsigned long __get_pfnblock_flags_mask(const struct page *page,
unsigned long pfn,
unsigned long mask)
{
@ -520,13 +520,14 @@ unsigned long __get_pfnblock_flags_mask(struct page *page,
*
* Return: pageblock_bits flags
*/
unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn,
unsigned long mask)
unsigned long get_pfnblock_flags_mask(const struct page *page,
unsigned long pfn, unsigned long mask)
{
return __get_pfnblock_flags_mask(page, pfn, mask);
}
static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn)
static __always_inline int get_pfnblock_migratetype(const struct page *page,
unsigned long pfn)
{
return __get_pfnblock_flags_mask(page, pfn, MIGRATETYPE_MASK);
}