Messages in this thread | | | Subject | Re: [PATCH] atomic: add atomic_inc_not_zero_hint() | From | Eric Dumazet <> | Date | Fri, 05 Nov 2010 20:12:51 +0100 |
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Le vendredi 05 novembre 2010 à 11:40 -0700, Paul E. McKenney a écrit :
> OK, so I cannot resist the challenge... ;-) >
I knew that ;)
> Suppose that the atomic_inc_not_zero_hint() is in common code that might > be invoked from a cleanup path. On the cleanup path, perhaps within an > RCU callback, if the reference is zero, we have the only reference and > thus don't need to increment the reference count. On the other hand, > if the reference is non-zero, we want to obtain a reference in order > to safely attempt to encourage the other reference holder to let go > more quickly. > > Perhaps a bit of a stretch, but why not just replace the above > "return 0" with "atomic_inc_not_zero(v)"? It will usually be > compiled out, right?
Yes indeed, thanks !
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