Peter Zijlstra 20273941f2 mm: fix race in kunmap_atomic() ... Christoph reported a nice splat which illustrated a race in the new stack based kmap_atomic implementation. The problem is that we pop our stack slot before we're completely done resetting its state -- in particular clearing the PTE (sometimes that's CONFIG_DEBUG_HIGHMEM). If an interrupt happens before we actually clear the PTE used for the last slot, that interrupt can reuse the slot in a dirty state, which triggers a BUG in kmap_atomic(). Fix this by introducing kmap_atomic_idx() which reports the current slot index without actually releasing it and use that to find the PTE and delay the _pop() until after we're completely done. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reported-by: Christoph Hellwig <hch@infradead.org> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-10-27 18:03:05 -07:00
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boot	FRV: Drop 'TOPDIR' from Makefiles	2008-01-28 23:14:37 +01:00
include/asm	mm: remove pte_*map_nested()	2010-10-26 16:52:08 -07:00
kernel	frv: double syscall restarts, syscall restart in sigreturn()	2010-09-20 10:44:38 -07:00
lib	irq_work: Add generic hardirq context callbacks	2010-10-18 19:58:50 +02:00
mb93090-mb00	mm: stack based kmap_atomic()	2010-10-26 16:52:08 -07:00
mm	mm: fix race in kunmap_atomic()	2010-10-27 18:03:05 -07:00
defconfig	defconfig reduction	2010-08-14 22:26:53 +02:00
Kconfig	irq_work: Add generic hardirq context callbacks	2010-10-18 19:58:50 +02:00
Kconfig.debug	[PATCH] frv: drop unsupported debugging features	2006-01-08 20:13:36 -08:00
Makefile	frv: clean up arch/frv/Makefile	2010-08-03 14:09:45 +02:00