2013/2/21 Russell King - ARM Linux <li...@arm.linux.org.uk>: > On Thu, Feb 21, 2013 at 10:53:07PM +0100, Frederic Weisbecker wrote: >> That too should be kcpustat_this_cpu_set(), or kcpustat_this_cpu_add() >> FWIW. But we probably don't need the overhead of atomic_add() that >> does a LOCK. >> atomic_set(var, atomic_read(var) + delta) would be better. All we need > > You mean atomic64_set() and atomic64_read().
Right. > Looking at the generic > version in lib/atomic64.c, atomic64_add() is cheaper for 32-bit arches > because it doesn't involve taking the lock twice. Yeah but that's the generic version. I guess the archs that have overriden don't take any locks there. -- 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/
