Messages in this thread |  | | | Date | Thu, 09 Jun 2011 12:53:43 +0300 | | From | Pekka Enberg <> | | Subject | Re: [slubllv7 04/17] x86: Add support for cmpxchg_double |
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On 6/1/11 8:25 PM, Christoph Lameter wrote: > A simple implementation that only supports the word size and does not > have a fallback mode (would require a spinlock). > > Add 32 and 64 bit support for cmpxchg_double. cmpxchg double uses > the cmpxchg8b or cmpxchg16b instruction on x86 processors to compare > and swap 2 machine words. This allows lockless algorithms to move more > context information through critical sections. > > Set a flag CONFIG_CMPXCHG_DOUBLE to signal that support for double word > cmpxchg detection has been build into the kernel. Note that each subsystem > using cmpxchg_double has to implement a fall back mechanism as long as > we offer support for processors that do not implement cmpxchg_double. > > Reviewed-by: H. Peter Anvin<hpa@zytor.com> > Cc: tj@kernel.org > Signed-off-by: Christoph Lameter<cl@linux.com>
Tejun, I'm going to queue this series for linux-next in the next few days. Could you either pick up this patch so I can pull from your tree or alternatively, is it OK to queue this through slab.git?
Pekka
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