Messages in this thread |  | | | Date | Fri, 8 Oct 2010 09:16:54 -0400 | | From | Chris Mason <> | | Subject | Re: [PATCH 09/18] fs: rework icount to be a locked variable |
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On Fri, Oct 08, 2010 at 10:17:14AM +0200, Christoph Hellwig wrote: > On Fri, Oct 08, 2010 at 06:50:01PM +1100, Dave Chinner wrote: > > > There's no need to lock a normal 32-bit variable for readers. > > > > Ok, but will need a memory barrier instead? > > Isn't spin_unlock supposed to be one? I'll need some of the locking > experts to shime in.
Not really a locking expert, but the locking operations are supposed to have an implicit barrier.
-chris
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