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SubjectRe: [PATCH] memory ordering in __kfifo primitives
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Le jeudi 10 août 2006 à 08:39 -0700, Paul E. McKenney a écrit :
> On Thu, Aug 10, 2006 at 04:26:53PM +0200, Stelian Pop wrote:
> > Le jeudi 10 août 2006 à 06:41 -0700, Paul E. McKenney a écrit :
> >
> > > I am happy to go either way -- the patch with the memory barriers
> > > (which does have the side-effect of slowing down kfifo_get() and
> > > kfifo_put(), by the way), or a patch removing the comments saying
> > > that it is OK to invoke __kfifo_get() and __kfifo_put() without
> > > locking.
> > >
> > > Any other thoughts on which is better? (1) the memory barriers or
> > > (2) requiring the caller hold appropriate locks across calls to
> > > __kfifo_get() and __kfifo_put()?
> >
> > If someone wants to use explicit locking, he/she can go with kfifo_get()
> > instead of the __ version.
>
> However, the kfifo_get()/kfifo_put() interfaces use the internal lock,

... and the internal lock can be supplied by the user at kfifo_alloc()
time.

Stelian.
--
Stelian Pop <stelian@popies.net>

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