Excerpts from Peter Zijlstra's message of November 11, 2020 11:44 pm: > On Wed, Nov 11, 2020 at 02:39:01PM +0100, Christophe Leroy wrote: >> Hello, >> >> Le 11/11/2020 à 12:07, Nicholas Piggin a écrit : >> > This passes atomic64 selftest on ppc32 on qemu (uniprocessor only) >> > both before and after powerpc is converted to use ARCH_ATOMIC. >> >> Can you explain what this change does and why it is needed ? > > That certainly should've been in the Changelog. This enables atomic > instrumentation, see asm-generic/atomic-instrumented.h. IOW, it makes > atomic ops visible to K*SAN. > Right. This specific patch doesn't actually "do" anything except allow generic atomic64 to be used with ARCH_ATOMIC. It does that by re-naming some things to avoid name collisions and also providing the arch_ prefix that ARCH_ATOMIC expects. I don't know what should be in the changelog. I suppose the latter, the former is discoverable by looking at ARCH_ATOMIC code and patches but I guess it's polite and doesn't hurt to include the former as well. I'll send an update before long. Thanks, Nick
