This is a note to let you know that I've just added the patch titled
mm/numa: Remove BUG_ON() in __handle_mm_fault()
to the 3.15-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-numa-remove-bug_on-in-__handle_mm_fault.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 107437febd495a50e2cd09c81bbaa84d30e57b07 Mon Sep 17 00:00:00 2001
From: Rik van Riel <riel@xxxxxxxxxx>
Date: Tue, 29 Apr 2014 15:36:15 -0400
Subject: mm/numa: Remove BUG_ON() in __handle_mm_fault()
From: Rik van Riel <riel@xxxxxxxxxx>
commit 107437febd495a50e2cd09c81bbaa84d30e57b07 upstream.
Changing PTEs and PMDs to pte_numa & pmd_numa is done with the
mmap_sem held for reading, which means a pmd can be instantiated
and turned into a numa one while __handle_mm_fault() is examining
the value of old_pmd.
If that happens, __handle_mm_fault() should just return and let
the page fault retry, instead of throwing an oops. This is
handled by the test for pmd_trans_huge(*pmd) below.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Reviewed-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Reported-by: Sunil Pandey <sunil.k.pandey@xxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: lwoodman@xxxxxxxxxx
Cc: dave.hansen@xxxxxxxxx
Link: http://lkml.kernel.org/r/20140429153615.2d72098e@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Patrick McLean <chutzpah@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 3 ---
1 file changed, 3 deletions(-)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3920,9 +3920,6 @@ static int __handle_mm_fault(struct mm_s
}
}
- /* THP should already have been handled */
- BUG_ON(pmd_numa(*pmd));
-
/*
* Use __pte_alloc instead of pte_alloc_map, because we can't
* run pte_offset_map on the pmd, if an huge pmd could
Patches currently in stable-queue which might be from riel@xxxxxxxxxx are
queue-3.15/mm-numa-remove-bug_on-in-__handle_mm_fault.patch
queue-3.15/mm-nommu-per-thread-vma-cache-fix.patch
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