From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762353AbYDVLPz (ORCPT ); Tue, 22 Apr 2008 07:15:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753673AbYDVLPq (ORCPT ); Tue, 22 Apr 2008 07:15:46 -0400 Received: from brick.kernel.dk ([87.55.233.238]:3734 "EHLO kernel.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753333AbYDVLPp (ORCPT ); Tue, 22 Apr 2008 07:15:45 -0400 Date: Tue, 22 Apr 2008 13:15:40 +0200 From: Jens Axboe To: Sam Ravnborg Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, npiggin@suse.de, torvalds@linux-foundation.org, Ingo Molnar Subject: Re: [PATCH 2/11] x86: convert to generic helpers for IPI function calls Message-ID: <20080422111539.GY12774@kernel.dk> References: <1208851058-8500-1-git-send-email-jens.axboe@oracle.com> <1208851058-8500-3-git-send-email-jens.axboe@oracle.com> <20080422083810.GA23540@uranus.ravnborg.org> <20080422084315.GT12774@kernel.dk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080422084315.GT12774@kernel.dk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 22 2008, Jens Axboe wrote: > On Tue, Apr 22 2008, Sam Ravnborg wrote: > > On Tue, Apr 22, 2008 at 09:57:28AM +0200, Jens Axboe wrote: > > > This converts x86 and x86-64 to use the new helpers for > > > smp_call_function() and friends, and adds support for > > > smp_call_function_single(). > > > > > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > > > index 87a693c..aab97e3 100644 > > > --- a/arch/x86/Kconfig > > > +++ b/arch/x86/Kconfig > > > @@ -156,6 +156,11 @@ config GENERIC_PENDING_IRQ > > > depends on GENERIC_HARDIRQS && SMP > > > default y > > > > > > +config GENERIC_SMP_HELPERS > > > + bool > > > + depends on SMP > > > + default y > > > + > > > > Hi Jens. > > > > [Not x86 specific - it was the first patch > > touching a Kconfig file] > > > > Could we define a single config variable > > in for example kernel/Kconfig(*) > > like this: > > > > config HAVE_GENERIC_SMP_HELPERS > > def_bool n > > > > And then the archs that uses the generic SMP helpers just > > do a simple: > > > > config X86 > > + select HAVE_GENERIC_SMP_HELPERS > > > > > > This is the recommended method today and is documented > > in Documentation/kbuild/kconfig-language.txt if > > you need a bit more intro. > > > > (*) I know we do not have kernel/Kconfig today. > > But maybe this is a good time to add it and > > source it from arch/Kconfig > > Ah yes, that looks like a better approach. I'll adapt the patches to > this method instead of selecting smp.o, thanks. I added config USE_GENERIC_SMP_HELPERS def_bool n in arch/Kconfig and added a 'select USE_GENERIC_SMP_HELPERS' in the arch private Kconfig files instead. It also reduces the line count further, thanks for the suggestion! It's cleaner this way. -- Jens Axboe