From: Andrea Arcangeli <aarcange@redhat.com>
Date: Wed, 16 Feb 2011 23:45:22 +0000 (-0800)
Subject: x86/mm: Fix pgd_lock deadlock
X-Git-Tag: v2.6.37.5~68
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f80e8b97a1fa31519c256a65587bcb1b5920985a;p=pandora-kernel.git

x86/mm: Fix pgd_lock deadlock

commit a79e53d85683c6dd9f99c90511028adc2043031f upstream.

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>
LKML-Reference: <201102162345.p1GNjMjm021738@imap1.linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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