[PATCH] arm64: hugetlb: fix the wrong return value for huge_ptep_set_access_flags

Huang Shijie shijie.huang at arm.com
Tue Jan 10 21:58:28 PST 2017

In current code, the @changed always returns the last one's
status for the huge page with the contiguous bit set.
This is really not what we want. Even one of the PTEs is changed,
we should tell it to the caller.

This patch fixes this issue.

Fixes: 66b3923a1a0f ("arm64: hugetlb: add support for PTE contiguous bit")
Cc: stable at vger.kernel.org
Signed-off-by: Huang Shijie <shijie.huang at arm.com>
 arch/arm64/mm/hugetlbpage.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 964b7549af5c..e25584d72396 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -239,7 +239,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,
                ncontig = find_num_contig(vma->vm_mm, addr, cpte,
                                          *cpte, &pgsize);
                for (i = 0; i < ncontig; ++i, ++cpte, addr += pgsize) {
-                       changed = ptep_set_access_flags(vma, addr, cpte,
+                       changed |= ptep_set_access_flags(vma, addr, cpte,

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