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| author | Hugh Dickins <[email protected]> | 2012-12-17 02:56:58 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2012-12-17 03:02:38 +0000 |
| commit | a4f1de176614f634c367e5994a7bcc428c940df0 (patch) | |
| tree | 9193f723c6f61442cf1fbc50e2db48d060f417d6 /fs/proc/array.c | |
| parent | Merge tag 'mfd-3.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/... (diff) | |
| download | kernel-a4f1de176614f634c367e5994a7bcc428c940df0.tar.gz kernel-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 <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'fs/proc/array.c')
0 files changed, 0 insertions, 0 deletions