On Sun, May 27, 2007 at 07:49:21PM -0700, David Miller wrote: > From: Martin Habets <errandir_news@xxxxxxxxxxxxxxxxx> > Date: Mon, 28 May 2007 01:07:46 +0100 > > > On Sat, May 26, 2007 at 03:59:21PM -0700, David Miller wrote: > > > Alternatively we can have a KCONFIG variable with reversed > > > logic, like "EMULATED_CMPXCHG" which only the atomically > > > challenged platforms need to set. > > > > Like this idea, but if we're not going to build DRM I see no > > point adding the cmpxchg emulation to sparc32. Maybe "NOARCH_CMPXCHG" > > would be better? > > It is likely that we are going to have generic users of cmpxchg() in > the kernel in the future (I think the -rt patch set has some which are > hard to get rid of) at which point we'd probably put the emulated > cmpxchg() in there anyways. > Yeah, David Howells wanted to use cmpxchg in his work struct patch, but had to not because not everyone implements it. >From what I can tell, very few arches actually have CAS, and others emulate it with LL/SC type implementations. Cheers, Kyle - To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
