| Message ID | 1497908927-93636-3-git-send-email-nitin.m.gupta@oracle.com |
|---|---|
| State | Changes Requested |
| Delegated to: | David Miller |
| Headers | show |
diff --git a/arch/sparc/mm/gup.c b/arch/sparc/mm/gup.c index 7cfa9c5..b1c649d 100644 --- a/arch/sparc/mm/gup.c +++ b/arch/sparc/mm/gup.c @@ -80,6 +80,8 @@ static int gup_huge_pmd(pmd_t *pmdp, pmd_t pmd, unsigned long addr, refs = 0; head = pmd_page(pmd); page = head + ((addr & ~PMD_MASK) >> PAGE_SHIFT); + if (PageTail(head)) + head = compound_head(head); do { VM_BUG_ON(compound_head(page) != head); pages[*nr] = page;
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. Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com> --- arch/sparc/mm/gup.c | 2 ++ 1 file changed, 2 insertions(+)