From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752471AbbIPCzu (ORCPT ); Tue, 15 Sep 2015 22:55:50 -0400 Received: from one.firstfloor.org ([193.170.194.197]:57849 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752025AbbIPCzs (ORCPT ); Tue, 15 Sep 2015 22:55:48 -0400 Date: Wed, 16 Sep 2015 04:55:46 +0200 From: Andi Kleen To: Andrew Morton Cc: Andi Kleen , Stephen Boyd , Andy Gross , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-soc@vger.kernel.org, linux-mips@linux-mips.org, Hauke Mehrtens , Paul Walmsley , =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= , Bjorn Andersson Subject: Re: [PATCH 0/3] Add __ioread32_copy() and use it Message-ID: <20150916025546.GE1747@two.firstfloor.org> References: <1442346089-32077-1-git-send-email-sboyd@codeaurora.org> <20150915155815.5a41a8dc537610ab44d8d3dc@linux-foundation.org> <20150916023219.GD1747@two.firstfloor.org> <20150915195031.0a1756a2.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150915195031.0a1756a2.akpm@linux-foundation.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Under what circumstances will the compiler (or linker?) do this? Compiler. > LTO enabled? Yes it's for LTO. The optimization allows the compiler to drop unused functions, which is very popular with users (a lot use it to get smaller kernel images) -Andi -- ak@linux.intel.com -- Speaking for myself only.