x86/mm: Fix pgd_lock deadlock

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It's forbidden to take the page_table_lock with the irq disabled
or if there's contention the IPIs (for tlb flushes) sent with
the page_table_lock held will never run leading to a deadlock.

Nobody takes the pgd_lock from irq context so the _irqsave can be
removed.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@kernel.org>
LKML-Reference: <201102162345.p1GNjMjm021738@imap1.linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Andrea Arcangeli 2011-02-16 15:45:22 -08:00 • committed by Ingo Molnar

parent f86268549f

commit a79e53d856

5 changed files with 22 additions and 30 deletions

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7

arch/x86/mm/fault.c

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6

arch/x86/mm/init_64.c

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18

arch/x86/mm/pageattr.c

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11

arch/x86/mm/pgtable.c

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10

arch/x86/xen/mmu.c

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