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mm/huge_memory: fix page_trans_huge_mapcount assumption of THP size

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Ask the page what size it is instead of assuming it's PMD size.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SeongJae Park <sjpark@amazon.de>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Link: https://lkml.kernel.org/r/20200908195539.25896-7-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2020-10-15 20:05:39 -07:00 committed by Linus Torvalds
parent 8cce547568
commit 65dfe3c3bc
1 changed files with 2 additions and 2 deletions
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4
mm/huge_memory.c
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@ -2558,14 +2558,14 @@ int page_trans_huge_mapcount(struct page *page, int *total_mapcount)
page = compound_head(page);
_total_mapcount = ret = 0;
for (i = 0; i < HPAGE_PMD_NR; i++) {
for (i = 0; i < thp_nr_pages(page); i++) {
mapcount = atomic_read(&page[i]._mapcount) + 1;
ret = max(ret, mapcount);
_total_mapcount += mapcount;
}
if (PageDoubleMap(page)) {
ret -= 1;
_total_mapcount -= HPAGE_PMD_NR;
_total_mapcount -= thp_nr_pages(page);
}
mapcount = compound_mapcount(page);
ret += mapcount;