On Mon, Dec 14, 2015 at 06:49:31PM +0000, One Thousand Gnomes wrote: > > But seriously are there any cases we actually care about this for osq ?
So I think what PaulMck is worried about is that one would expect things like: mutex_lock(); MMIO(++var); mutex_unlock(); (the same example Linus gave but with a mutex instead of a spinlock) to just work. Now, I haven't checked the code, but I'm not sure we ever rely on osq to provide the mutex ACQUIRE barrier, since we always need to acquire the mutex variable itself after we've acquired the osq 'lock'. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/