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Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:42134) by pandora.armlinux.org.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) (envelope-from ) id 1iXMte-0007c8-00; Wed, 20 Nov 2019 10:07:38 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.92) (envelope-from ) id 1iXMtd-0001dF-8A; Wed, 20 Nov 2019 10:07:37 +0000 Date: Wed, 20 Nov 2019 10:07:37 +0000 From: Russell King - ARM Linux admin To: Masahiro Yamada Subject: Re: [PATCH] ARM: don't export unused return_address() Message-ID: <20191120100737.GL25745@shell.armlinux.org.uk> References: <20190906154706.2449696-1-arnd@arndb.de> <20191113114517.GO25745@shell.armlinux.org.uk> <20191113170058.GP25745@shell.armlinux.org.uk> <20191120090744.GH25745@shell.armlinux.org.uk> <20191120095111.GI25745@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191120095111.GI25745@shell.armlinux.org.uk> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191120_020748_780578_974A05C6 X-CRM114-Status: GOOD ( 27.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Arnd Bergmann , Linux Kernel Mailing List , Geert Uytterhoeven , Thomas Gleixner , Enrico Weigelt , Linux ARM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Nov 20, 2019 at 09:51:11AM +0000, Russell King - ARM Linux admin wrote: > On Wed, Nov 20, 2019 at 06:42:52PM +0900, Masahiro Yamada wrote: > > Hi Russell, > > > > > > On Wed, Nov 20, 2019 at 6:07 PM Russell King - ARM Linux admin > > wrote: > > > > > > On Wed, Nov 20, 2019 at 06:02:13PM +0900, Masahiro Yamada wrote: > > > > Hi Arnd, > > > > > > > > > > > > > > > > On Thu, Nov 14, 2019 at 2:01 AM Russell King - ARM Linux admin > > > > wrote: > > > > > > > > > > On Wed, Nov 13, 2019 at 02:15:00PM +0100, Geert Uytterhoeven wrote: > > > > > > Hi Russell, > > > > > > > > > > > > On Wed, Nov 13, 2019 at 12:45 PM Russell King - ARM Linux admin > > > > > > wrote: > > > > > > > On Wed, Nov 13, 2019 at 08:40:39PM +0900, Masahiro Yamada wrote: > > > > > > > > On Tue, Oct 1, 2019 at 11:31 PM Geert Uytterhoeven wrote: > > > > > > > > > On Fri, Sep 6, 2019 at 5:47 PM Arnd Bergmann wrote: > > > > > > > > > > Without the frame pointer enabled, return_address() is an inline > > > > > > > > > > function and does not need to be exported, as shown by this warning: > > > > > > > > > > > > > > > > > > > > WARNING: "return_address" [vmlinux] is a static EXPORT_SYMBOL_GPL > > > > > > > > > > > > > > > > > > > > Move the EXPORT_SYMBOL_GPL() into the #ifdef as well. > > > > > > > > > > > > > > > > > > > > Signed-off-by: Arnd Bergmann > > > > > > > > > > > > > > > > > > Thanks for your patch! > > > > > > > > > > > > > > > > > > Tested-by: Geert Uytterhoeven > > > > > > > > > > > > > > > > > > > --- a/arch/arm/kernel/return_address.c > > > > > > > > > > +++ b/arch/arm/kernel/return_address.c > > > > > > > > > > @@ -53,6 +53,7 @@ void *return_address(unsigned int level) > > > > > > > > > > return NULL; > > > > > > > > > > } > > > > > > > > > > > > > > > > > > > > > > > > > > > > Checkpatch doesn't like the empty line above: > > > > > > > > > > > > > > > > > > WARNING: EXPORT_SYMBOL(foo); should immediately follow its function/variable > > > > > > > > > > > > > > > > > > > +EXPORT_SYMBOL_GPL(return_address); > > > > > > > > > > + > > > > > > > > > > #endif /* if defined(CONFIG_FRAME_POINTER) && !defined(CONFIG_ARM_UNWIND) */ > > > > > > > > > > > > > > > > > > > > -EXPORT_SYMBOL_GPL(return_address); > > > > > > > > > > > > > > What has happened to this patch? > > > > > > > > > > > > > > > > I still see this warning. > > > > > > > > > > > > > > Simple - it got merged, it caused build regressions, it got dropped. > > > > > > > A new version is pending me doing another round of patch merging. > > > > > > > > > > > > I believe that was not Arnd's patch, but Ben Dooks' alternative solution[*]? > > > > > > > > > > I don't keep track of who did what, sorry. > > > > > > > > > > > > Arnd, > > > > > > > > I believe this patch is the correct fix. > > > > Could you please put it into Russell's patch tracker? > > > > (patches@arm.linux.org.uk) > > > > > > Is there something wrong with: > > > > > > fb033c95c94c ARM: 8918/2: only build return_address() if needed > > > > > > I haven't seen any build issues with that. > > > > > > Sorry, I had not checked Ben's patch because you said > > "Simple - it got merged, it caused build regressions, it got dropped." > > That was 8918/1. Ben fixed his patch, and submitted an updated > version. > > > Yup, I've checked it right now, > > and it looks good to me. > > > > But, I do not see that commit in the latest linux-next > > (next-20191120). > > > > Could you really apply it if you have not. > > It was applied last Friday and was pushed out there and then. > > $ git ls-remote zeniv | grep for-next > 022eb8ae8b5ee8c5c813923c69b5ebb1e9612c4c refs/heads/for-next > $ git lg for-next > 022eb8ae8b5e ARM: 8938/1: kernel: initialize broadcast hrtimer based > clock event device > ... > fb033c95c94c ARM: 8918/2: only build return_address() if needed > > I've no idea why linux-next doesn't have it. Okay, apparently linux-next _does_ have it: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/arch/arm/kernel/Makefile so I think you're confused. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up According to speedtest.net: 11.9Mbps down 500kbps up _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel