+ mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix.patch added to -mm tree

+ mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix.patch added to -mm tree

[akpm]

The patch titled
     Subject: mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix
has been added to the -mm tree.  Its filename is
     mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix.patch

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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill@shutemov.name>
Subject: mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix

drop unneeded pmd_trans_unstable(pmd) check after __split_huge_pmd()

index f9c07f54dd62..e919e4613eab 100644
Link: http://lkml.kernel.org/r/20170208120421.GE5578@node.shutemov.name
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mprotect.c |    2 --
 1 file changed, 2 deletions(-)

diff -puN mm/mprotect.c~mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix mm/mprotect.c
--- a/mm/mprotect.c~mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix
+++ a/mm/mprotect.c
@@ -163,8 +163,6 @@ static inline unsigned long change_pmd_r
 		if (pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) {
 			if (next - addr != HPAGE_PMD_SIZE) {
 				__split_huge_pmd(vma, pmd, addr, false, NULL);
-				if (pmd_trans_unstable(pmd))
-					continue;
 			} else {
 				int nr_ptes = change_huge_pmd(vma, pmd, addr,
 						newprot, prot_numa);
_

Patches currently in -mm which might be from kirill@shutemov.name are

mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock-fix.patch