This is a note to let you know that I've just added the patch titled
mm: don't overwrite mm->def_flags in do_mlockall()
to the 3.7-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:
mm-don-t-overwrite-mm-def_flags-in-do_mlockall.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 9977f0f164d46613288e0b5778eae500dfe06f31 Mon Sep 17 00:00:00 2001
From: Gerald Schaefer <[email protected]>
Date: Tue, 12 Feb 2013 13:46:20 -0800
Subject: mm: don't overwrite mm->def_flags in do_mlockall()
From: Gerald Schaefer <[email protected]>
commit 9977f0f164d46613288e0b5778eae500dfe06f31 upstream.
With commit 8e72033f2a48 ("thp: make MADV_HUGEPAGE check for
mm->def_flags") the VM_NOHUGEPAGE flag may be set on s390 in
mm->def_flags for certain processes, to prevent future thp mappings.
This would be overwritten by do_mlockall(), which sets it back to 0 with
an optional VM_LOCKED flag set.
To fix this, instead of overwriting mm->def_flags in do_mlockall(), only
the VM_LOCKED flag should be set or cleared.
Signed-off-by: Gerald Schaefer <[email protected]>
Reported-by: Vivek Goyal <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
mm/mlock.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -517,11 +517,11 @@ SYSCALL_DEFINE2(munlock, unsigned long,
static int do_mlockall(int flags)
{
struct vm_area_struct * vma, * prev = NULL;
- unsigned int def_flags = 0;
if (flags & MCL_FUTURE)
- def_flags = VM_LOCKED;
- current->mm->def_flags = def_flags;
+ current->mm->def_flags |= VM_LOCKED;
+ else
+ current->mm->def_flags &= ~VM_LOCKED;
if (flags == MCL_FUTURE)
goto out;
Patches currently in stable-queue which might be from
[email protected] are
queue-3.7/mm-don-t-overwrite-mm-def_flags-in-do_mlockall.patch
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