From: kernel test robot <yujie.liu@intel.com>
To: Stephane Eranian <eranian@google.com>
Cc: <llvm@lists.linux.dev>, <kbuild-all@lists.01.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
x86 <x86@kernel.org>
Subject: [tip:perf/core 3/10] arch/x86/events/amd/core.c:722:3: warning: Value stored to 'hwc' is never read [clang-analyzer-deadcode.DeadStores]
Date: Wed, 13 Apr 2022 16:43:38 +0800 [thread overview]
Message-ID: <5f198292-247a-e3bd-f3b2-0052d318fc20@intel.com> (raw)
In-Reply-To: <202204110431.SBvb4g5G-lkp@intel.com>
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core
head: 7bebfe9dd802b80abff5a43e00ab68d98893a22c
commit: ada543459cab7f653dcacdaba4011a8bb19c627c [3/10] perf/x86/amd: Add AMD Fam19h Branch Sampling support
config: x86_64-randconfig-c007 (https://download.01.org/0day-ci/archive/20220411/202204110431.SBvb4g5G-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c29a51b3a257908aebc01cd7c4655665db317d66)
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/tip/tip.git/commit/?id=ada543459cab7f653dcacdaba4011a8bb19c627c
git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git fetch --no-tags tip perf/core
git checkout ada543459cab7f653dcacdaba4011a8bb19c627c
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <yujie.liu@intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
>> arch/x86/events/amd/core.c:722:3: warning: Value stored to 'hwc' is never read [clang-analyzer-deadcode.DeadStores]
hwc = &cpuc->events[idx]->hw;
^ ~~~~~~~~~~~~~~~~~~~~~~
vim +/hwc +722 arch/x86/events/amd/core.c
ada543459cab7f Stephane Eranian 2022-03-22 712
ada543459cab7f Stephane Eranian 2022-03-22 713 static void amd_pmu_enable_all(int added)
ada543459cab7f Stephane Eranian 2022-03-22 714 {
ada543459cab7f Stephane Eranian 2022-03-22 715 struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events);
ada543459cab7f Stephane Eranian 2022-03-22 716 struct hw_perf_event *hwc;
ada543459cab7f Stephane Eranian 2022-03-22 717 int idx;
ada543459cab7f Stephane Eranian 2022-03-22 718
ada543459cab7f Stephane Eranian 2022-03-22 719 amd_brs_enable_all();
ada543459cab7f Stephane Eranian 2022-03-22 720
ada543459cab7f Stephane Eranian 2022-03-22 721 for (idx = 0; idx < x86_pmu.num_counters; idx++) {
ada543459cab7f Stephane Eranian 2022-03-22 @722 hwc = &cpuc->events[idx]->hw;
ada543459cab7f Stephane Eranian 2022-03-22 723
ada543459cab7f Stephane Eranian 2022-03-22 724 /* only activate events which are marked as active */
ada543459cab7f Stephane Eranian 2022-03-22 725 if (!test_bit(idx, cpuc->active_mask))
ada543459cab7f Stephane Eranian 2022-03-22 726 continue;
ada543459cab7f Stephane Eranian 2022-03-22 727
ada543459cab7f Stephane Eranian 2022-03-22 728 amd_pmu_enable_event(cpuc->events[idx]);
ada543459cab7f Stephane Eranian 2022-03-22 729 }
ada543459cab7f Stephane Eranian 2022-03-22 730 }
ada543459cab7f Stephane Eranian 2022-03-22 731
--
0-DAY CI Kernel Test Service
https://01.org/lkp
parent reply other threads:[~2022-04-13 8:44 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <202204110431.SBvb4g5G-lkp@intel.com>]
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