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| author |   Hugh Dickins <hughd@google.com> | 2012-12-16 18:56:58 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-16 19:02:38 -0800 |
| commit | a4f1de176614f634c367e5994a7bcc428c940df0 (patch) | |
| tree | 9193f723c6f61442cf1fbc50e2db48d060f417d6 /arch/arm/boot | |
| parent | Merge tag 'mfd-3.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 (diff) | |
| download | linux-dev-a4f1de176614f634c367e5994a7bcc428c940df0.tar.xz linux-dev-a4f1de176614f634c367e5994a7bcc428c940df0.zip | |
mm: fix kernel BUG at huge_memory.c:1474!
Andrea's autonuma-benchmark numa01 hits kernel BUG at huge_memory.c:1474!
in change_huge_pmd called from change_protection from change_prot_numa
from task_numa_work.
That BUG, introduced in the huge zero page commit cad7f613c4d0 ("thp:
change_huge_pmd(): make sure we don't try to make a page writable")
was trying to verify that newprot never adds write permission to an
anonymous huge page; but Automatic NUMA Balancing's 4b10e7d562c9 ("mm:
mempolicy: Implement change_prot_numa() in terms of change_protection()")
adds a new prot_numa path into change_huge_pmd(), which makes no use of
the newprot provided, and may retain the write bit in the pmd.
Just move the BUG_ON(pmd_write(entry)) up into the !prot_numa block.
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm/boot')
0 files changed, 0 insertions, 0 deletions