Patch "arm64: hugetlb: fix the wrong return value for huge_ptep_set_access_flags" has been added to the 4.9-stable tree

Patch "arm64: hugetlb: fix the wrong return value for huge_ptep_set_access_flags" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: hugetlb: fix the wrong return value for huge_ptep_set_access_flags

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-hugetlb-fix-the-wrong-return-value-for-huge_ptep_set_access_flags.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 69d012345a1a32d3f03957f14d972efccc106a98 Mon Sep 17 00:00:00 2001
From: Huang Shijie <shijie.huang@arm.com>
Date: Wed, 11 Jan 2017 14:02:00 +0800
Subject: arm64: hugetlb: fix the wrong return value for huge_ptep_set_access_flags

From: Huang Shijie <shijie.huang@arm.com>

commit 69d012345a1a32d3f03957f14d972efccc106a98 upstream.

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")
Signed-off-by: Huang Shijie <shijie.huang@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/mm/hugetlbpage.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -239,7 +239,7 @@ int huge_ptep_set_access_flags(struct vm
 		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,
 							pfn_pte(pfn,
 								hugeprot),
 							dirty);


Patches currently in stable-queue which might be from shijie.huang@arm.com are

queue-4.9/arm64-hugetlb-fix-the-wrong-address-for-several-functions.patch
queue-4.9/arm64-hugetlb-remove-the-wrong-pmd-check-in-find_num_contig.patch
queue-4.9/arm64-hugetlb-fix-the-wrong-return-value-for-huge_ptep_set_access_flags.patch