Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757927AbbKSIQJ (ORCPT ); Thu, 19 Nov 2015 03:16:09 -0500 Received: from mail-wm0-f49.google.com ([74.125.82.49]:36523 "EHLO mail-wm0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751857AbbKSIQG (ORCPT ); Thu, 19 Nov 2015 03:16:06 -0500 Date: Thu, 19 Nov 2015 09:16:02 +0100 From: Ingo Molnar To: Chris Wilson Cc: Chuck Ebbert , linux-kernel@vger.kernel.org, Andrew Morton , Tejun Heo , Andy Lutomirski , Rusty Russell , Peter Zijlstra , Masami Hiramatsu , Jiri Kosina , "H. Peter Anvin" , Steven Rostedt , Jason Baron , yrl.pp-manager.tt@hitachi.com, Borislav Petkov , Daniel Vetter Subject: Re: i915.ko WC writes are slow after ea8596bb2d8d379 Message-ID: <20151119081602.GC16214@gmail.com> References: <20141008090336.GD12897@nuc-i3427.alporthouse.com> <20141008051059.65566251@as> <20151118144811.GA1043@nuc-i3427.alporthouse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151118144811.GA1043@nuc-i3427.alporthouse.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1166 Lines: 38 * Chris Wilson wrote: > > > A bisection pointed to > > > > > > commit ea8596bb2d8d37957f3e92db9511c50801689180 > > > Author: Masami Hiramatsu > > > Date: Thu Jul 18 20:47:53 2013 +0900 > > > > > > kprobes/x86: Remove unused text_poke_smp() and text_poke_smp_batch() functions > > > > > > of which the active ingredient was just > > > > > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > > > index b32ebf9..f4001e0 100644 > > > --- a/arch/x86/Kconfig > > > +++ b/arch/x86/Kconfig > > > @@ -2334,7 +2334,6 @@ config HAVE_ATOMIC_IOMAP > > > > > > config HAVE_TEXT_POKE_SMP > > > bool > > > - select STOP_MACHINE if SMP Ouch... This is certainly an educative example of how pure 'code removal' patches can have unintended side effects. Is there a full fix patch available, and is anyone pushing that to Linus? Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/