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sparc64: Fix gup_huge_pmd

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The function assumes that each PMD points to head of a
huge page. This is not correct as a PMD can point to
start of any 8M region with a, say 256M, hugepage. The
fix ensures that it points to the correct head of any PMD
huge page.

Cc: Julian Calaby <julian.calaby@gmail.com>
Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nitin Gupta 2017-06-22 17:15:08 -07:00 committed by David S. Miller
parent d8f431a0de
commit dbd2667a4f
1 changed files with 2 additions and 2 deletions
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4
arch/sparc/mm/gup.c
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@ -78,8 +78,8 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr,
return 0;
refs = 0;
head = pmd_page(pmd);
page = head + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
page = pmd_page(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
head = compound_head(page);
do {
VM_BUG_ON(compound_head(page) != head);
pages[*nr] = page;