Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752919AbbDGR6D (ORCPT ); Tue, 7 Apr 2015 13:58:03 -0400 Received: from mail.kernel.org ([198.145.29.136]:55206 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752748AbbDGR57 (ORCPT ); Tue, 7 Apr 2015 13:57:59 -0400 MIME-Version: 1.0 In-Reply-To: <7hwq1v4iq4.fsf@deeprootsystems.com> References: <20150324004537.GA24816@verge.net.au> <20150324161358.GA694@kahuna> <20150326003939.GA25368@verge.net.au> <20150326133631.GB2805@arm.com> <20150327002554.GA5527@verge.net.au> <20150327100612.GB1562@arm.com> <7hbnj99epe.fsf@deeprootsystems.com> <7h8uec95t2.fsf@deeprootsystems.com> <551BBEC5.7070801@arm.com> <20150401124007.20c440cc43a482f698f461b8@linux-foundation.org> <7hwq1v4iq4.fsf@deeprootsystems.com> Date: Tue, 7 Apr 2015 10:57:52 -0700 Message-ID: Subject: Re: [PATCH] mm/migrate: Mark unmap_and_move() "noinline" to avoid ICE in gcc 4.7.3 From: Kevin Hilman To: Kevin Hilman Cc: Andrew Morton , Marc Zyngier , Geert Uytterhoeven , Ard Biesheuvel , Will Deacon , Simon Horman , Tyler Baker , Nishanth Menon , Russell King - ARM Linux , Arnd Bergmann , "linux-sh@vger.kernel.org" , Catalin Marinas , Magnus Damm , "grygorii.strashko@linaro.org" , "linux-omap@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Linux Kernel Development , "linux-mm@kvack.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2164 Lines: 57 Hi Andrew, On Wed, Apr 1, 2015 at 2:54 PM, Kevin Hilman wrote: > Andrew Morton writes: > >> On Wed, 01 Apr 2015 10:47:49 +0100 Marc Zyngier wrote: >> >>> > -static int unmap_and_move(new_page_t get_new_page, free_page_t put_new_page, >>> > - unsigned long private, struct page *page, int force, >>> > - enum migrate_mode mode) >>> > +static noinline int unmap_and_move(new_page_t get_new_page, >>> > + free_page_t put_new_page, >>> > + unsigned long private, struct page *page, >>> > + int force, enum migrate_mode mode) >>> > { >>> > int rc = 0; >>> > int *result = NULL; >>> > >>> >>> Ouch. That's really ugly. And on 32bit ARM, we end-up spilling half of >>> the parameters on the stack, which is not going to help performance >>> either (not that this would be useful on 32bit ARM anyway...). >>> >>> Any chance you could make this dependent on some compiler detection >>> mechanism? >> >> With my arm compiler (gcc-4.4.4) the patch makes no difference - >> unmap_and_move() isn't being inlined anyway. >> >> How does this look? >> >> Kevin, could you please retest? I might have fat-fingered something... > > Your patch on top of Geert's still compiles fine for me with gcc-4.7.3. > However, I'm not sure how specific we can be on the versions. > > /me goes to test a few more compilers... OK... > > ICE: 4.7.1, 4.7.3, 4.8.3 > OK: 4.6.3, 4.9.2, 4.9.3 > > The diff below[2] on top of yours compiles fine here and at least covers > the compilers I *know* to trigger the ICE. I see my fix in your mmots since last Thurs (4/2), but it's not in mmotm (last updated today) so today's linux-next still has the ICE for anything other than gcc-4.7.3. Just checking to see when you plan to update mmotm. Thanks, Kevin -- 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/