From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756593AbaCOVST (ORCPT ); Sat, 15 Mar 2014 17:18:19 -0400 Received: from mail-pa0-f44.google.com ([209.85.220.44]:38130 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756190AbaCOVSS (ORCPT ); Sat, 15 Mar 2014 17:18:18 -0400 Message-ID: <5324C3B2.1000802@gmail.com> Date: Sun, 16 Mar 2014 05:18:42 +0800 From: Chen Gang User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 MIME-Version: 1.0 To: Hans-Christian Egtvedt CC: =?ISO-8859-1?Q?H=E5vard_Skinnemoen?= , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] arch/avr32/mm/cache.c: export symbol flush_icache_range() for module using References: <531B8D32.6000000@gmail.com> <531B8FD8.6040704@gmail.com> <20140308221721.GA30934@samfundet.no> <531C8683.2010908@gmail.com> In-Reply-To: <531C8683.2010908@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/09/2014 11:19 PM, Chen Gang wrote: > On 03/09/2014 06:17 AM, Hans-Christian Egtvedt wrote: >> Around Sun 09 Mar 2014 05:47:04 +0800 or thereabout, Chen Gang wrote: >>> >>> After this patch, our linux kernel can pass "avr32-linux-" allmodconfig >>> (it contents quite a few of warnings, but after check, I guess they are >>> not kernel's issue). >> >> That sounds great, I am a bit surprised however that the lkdtm module need >> flush_icache_range. Would have been interesting to look into what causes this >> dependency. >> After read a little more details for lkdtm, I guess "after overwrite an executable area by do_nothing(), it needs flush_icache_range() to be sure the new instructions/data must have effect with all cpu". Welcome any additional information for it. Thanks. > > "driver/misc/lkdtm.c" will use this flush_icache_range(). > > And some architectures export it to modules. > > [root@gchen arch]# grep -rn flush_icache_range * | grep EXPORT > arm64/mm/flush.c:105:EXPORT_SYMBOL(flush_icache_range); > avr32/mm/cache.c:114:EXPORT_SYMBOL(flush_icache_range); > m68k/mm/cache.c:106:EXPORT_SYMBOL(flush_icache_range); > mn10300/mm/cache-inv-icache.c:129:EXPORT_SYMBOL(flush_icache_range); > mn10300/mm/cache-flush-icache.c:155:EXPORT_SYMBOL(flush_icache_range); > sparc/mm/init_64.c:435:EXPORT_SYMBOL(flush_icache_range); > > > Welcome any more details information by any other members, thanks. > > Thanks. -- Chen Gang Open, share and attitude like air, water and life which God blessed