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a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1617650949; bh=bzUPKzJcAzUg9135K6PV+zAgO5dxTzilLlIATkvx7n4=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=D57OXMd1INCX2QACLpD55GFCuYZcdVEyDUM09lWQVt8GFP/AD8WkymG9ULOw/DgTN jgRAlVKhOfrjEUvPAcYO9Suc+zHB9ZS10g8kxL2wcjWGpP2SlxL26B7iH7AH7G+XMN JQ93CHNYKjnf0lt15lZZWbe272uweWiI4mbzyQdY= Date: Mon, 5 Apr 2021 12:29:08 -0700 From: Andrew Morton To: kernel test robot Cc: Andrey Konovalov , kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Marco Elver , Alexander Potapenko , Linux Memory Management List Subject: Re: lib/test_kasan_module.c:25:6: warning: variable 'unused' set but not used Message-Id: <20210405122908.a478d97cdc9495638e61b566@linux-foundation.org> In-Reply-To: <202104050216.HflRxfJm-lkp@intel.com> References: <202104050216.HflRxfJm-lkp@intel.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: idnjzti3nyqccc9oehpcwtwdutp7jq6g X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 18664600011D Received-SPF: none (linux-foundation.org>: No applicable sender policy available) receiver=imf25; identity=mailfrom; envelope-from=""; helo=mail.kernel.org; client-ip=198.145.29.99 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617650949-63420 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 5 Apr 2021 02:16:25 +0800 kernel test robot wrote: > Hi Andrey, > > First bad commit (maybe != root cause): > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: 2023a53bdf41b7646b1d384b6816af06309f73a5 > commit: 5d92bdffd2d53f98de683229c0ad7d028703fdba kasan: rename CONFIG_TEST_KASAN_MODULE > date: 6 weeks ago > config: arm-randconfig-r024-20210404 (attached as .config) > compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 > reproduce (this is a W=1 build): > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5d92bdffd2d53f98de683229c0ad7d028703fdba > git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > git fetch --no-tags linus master > git checkout 5d92bdffd2d53f98de683229c0ad7d028703fdba > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot > > All warnings (new ones prefixed by >>): > > lib/test_kasan_module.c: In function 'copy_user_test': > >> lib/test_kasan_module.c:25:6: warning: variable 'unused' set but not used [-Wunused-but-set-variable] > 25 | int unused; > | ^~~~~~ Fair enough ;) --- a/lib/test_kasan_module.c~a +++ a/lib/test_kasan_module.c @@ -22,7 +22,7 @@ static noinline void __init copy_user_te char *kmem; char __user *usermem; size_t size = 10; - int unused; + int __maybe_unused unused; kmem = kmalloc(size, GFP_KERNEL); if (!kmem) _ I guess we could test the copy_*_user return values are as expected, but that isn't the point?