On Wed, Jan 25, 2023 at 06:51:45PM -0300, Guilherme G. Piccoli wrote: > From: Deepak Sharma <deepak.sharma@xxxxxxx> > > commit a8fb40966f19ff81520d9ccf8f7e2b95201368b8 upstream. > > All Zen or newer CPU which support C3 shares cache. Its not necessary to > flush the caches in software before entering C3. This will cause drop in > performance for the cores which share some caches. ARB_DIS is not used > with current AMD C state implementation. So set related flags correctly. > > Signed-off-by: Deepak Sharma <deepak.sharma@xxxxxxx> > Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > Signed-off-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx> > --- > > > Hi folks, this is a very simple optimization that might be read > as a fix IMO, since it's setting the flags correctly for the Zen CPUs. > It was built/boot tested in the Steam Deck. > > The backport for stable was a suggestion from Greg [0], so lemme > know if any of you see an issue with that, or if we should target > other stable versions (or less versions, maybe only 5.15). > Cheers, Looks good, thanks for the backport, now queued up! greg k-h
