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mm/page_alloc.c: extract the common part in pfn_to_bitidx()

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The return value calculation is the same both for SPARSEMEM or not.

Just take it out.

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Link: http://lkml.kernel.org/r/20200623124201.8199-2-richard.weiyang@linux.alibaba.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wei Yang 2020-08-06 23:25:44 -07:00 committed by Linus Torvalds
parent d38ac97f8a
commit 399b795b7a
1 changed files with 1 additions and 2 deletions
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mm/page_alloc.c
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@ -459,11 +459,10 @@ static inline int pfn_to_bitidx(struct page *page, unsigned long pfn)
{ {
#ifdef CONFIG_SPARSEMEM #ifdef CONFIG_SPARSEMEM
pfn &= (PAGES_PER_SECTION-1); pfn &= (PAGES_PER_SECTION-1);
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#else #else
pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages); pfn = pfn - round_down(page_zone(page)->zone_start_pfn, pageblock_nr_pages);
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#endif /* CONFIG_SPARSEMEM */ #endif /* CONFIG_SPARSEMEM */
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
} }
/** /**