Messages in this thread | | | Date | Tue, 6 Oct 2015 10:01:52 +0100 | From | Will Deacon <> | Subject | Re: [PATCH 1/5] asm-generic: Add _{relaxed|acquire|release}() variants for inc/dec atomics |
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On Mon, Oct 05, 2015 at 09:48:24PM +0200, Peter Zijlstra wrote: > On Mon, Oct 05, 2015 at 06:32:43PM +0100, Will Deacon wrote: > > On Thu, Oct 01, 2015 at 07:39:10AM +0100, Peter Zijlstra wrote: > > > On Wed, Sep 30, 2015 at 01:03:11PM -0700, Davidlohr Bueso wrote: > > > > Similar to what we have for regular add/sub calls. For now, no actual arch > > > > implements them, so everyone falls back to the default atomics... iow, > > > > nothing changes. These will be used in future primitives. > > > > > > > > > > Maybe also do an aargh64 patch for this? > > > > I can follow up with that, since I'm about 60% through adding the > > relaxed/acquire/release versions of all the other primitives. It's a fair > > amount of work thanks to the new atomic instructions making me do everything > > twice... (that and I've been on holiday this past week!) > > Right, what I meant was arm (I thought argh64 was the one with _relaxed > bits in, but my memories tricked me, it was ARM). > > If you add new _relaxed ops, we'd better convert all archs that support > _relaxed, which would be ARM (for now).
Right, yeah, arch/arm/ will need updating along with this series. Should be straightforward to implement them in terms of atomic_{add,sub}_*.
Will
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