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Date: Mon, 28 Mar 2022 12:59:46 +0800
From: kernel test robot <yujie.liu@...el.com>
To: Christian König <christian.koenig@....com>
CC: <llvm@...ts.linux.dev>, <kbuild-all@...ts.01.org>,
"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [drm-misc:for-linux-next 2/3]
drivers/dma-buf/st-dma-fence-unwrap.c:148:4: warning: Value stored to 'err'
is never read [clang-analyzer-deadcode.DeadStores]
tree: git://anongit.freedesktop.org/drm/drm-misc for-linux-next
head: 519f490db07e1a539490612f376487f61e48e39c
commit: 64a8f92fd783e750cdb81af75942dcd53bbf61bd [2/3] dma-buf: add dma_fence_unwrap v2
config: riscv-randconfig-c006-20220324 (https://download.01.org/0day-ci/archive/20220327/202203270435.TtRcG3Pv-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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
# install riscv cross compiling tool for clang build
# apt-get install binutils-riscv64-linux-gnu
git remote add drm-misc git://anongit.freedesktop.org/drm/drm-misc
git fetch --no-tags drm-misc for-linux-next
git checkout 64a8f92fd783e750cdb81af75942dcd53bbf61bd
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <yujie.liu@...el.com>
clang-analyzer warnings: (new ones prefixed by >>)
>> drivers/dma-buf/st-dma-fence-unwrap.c:148:4: warning: Value stored to 'err' is never read [clang-analyzer-deadcode.DeadStores]
err = -EINVAL;
^ ~~~~~~~
vim +/err +148 drivers/dma-buf/st-dma-fence-unwrap.c
64a8f92fd783e75 Christian König 2022-03-11 120
64a8f92fd783e75 Christian König 2022-03-11 121 static int unwrap_array(void *arg)
64a8f92fd783e75 Christian König 2022-03-11 122 {
64a8f92fd783e75 Christian König 2022-03-11 123 struct dma_fence *fence, *f1, *f2, *array;
64a8f92fd783e75 Christian König 2022-03-11 124 struct dma_fence_unwrap iter;
64a8f92fd783e75 Christian König 2022-03-11 125 int err = 0;
64a8f92fd783e75 Christian König 2022-03-11 126
64a8f92fd783e75 Christian König 2022-03-11 127 f1 = mock_fence();
64a8f92fd783e75 Christian König 2022-03-11 128 if (!f1)
64a8f92fd783e75 Christian König 2022-03-11 129 return -ENOMEM;
64a8f92fd783e75 Christian König 2022-03-11 130
64a8f92fd783e75 Christian König 2022-03-11 131 f2 = mock_fence();
64a8f92fd783e75 Christian König 2022-03-11 132 if (!f2) {
64a8f92fd783e75 Christian König 2022-03-11 133 dma_fence_put(f1);
64a8f92fd783e75 Christian König 2022-03-11 134 return -ENOMEM;
64a8f92fd783e75 Christian König 2022-03-11 135 }
64a8f92fd783e75 Christian König 2022-03-11 136
64a8f92fd783e75 Christian König 2022-03-11 137 array = mock_array(2, f1, f2);
64a8f92fd783e75 Christian König 2022-03-11 138 if (!array)
64a8f92fd783e75 Christian König 2022-03-11 139 return -ENOMEM;
64a8f92fd783e75 Christian König 2022-03-11 140
64a8f92fd783e75 Christian König 2022-03-11 141 dma_fence_unwrap_for_each(fence, &iter, array) {
64a8f92fd783e75 Christian König 2022-03-11 142 if (fence == f1) {
64a8f92fd783e75 Christian König 2022-03-11 143 f1 = NULL;
64a8f92fd783e75 Christian König 2022-03-11 144 } else if (fence == f2) {
64a8f92fd783e75 Christian König 2022-03-11 145 f2 = NULL;
64a8f92fd783e75 Christian König 2022-03-11 146 } else {
64a8f92fd783e75 Christian König 2022-03-11 147 pr_err("Unexpected fence!\n");
64a8f92fd783e75 Christian König 2022-03-11 @148 err = -EINVAL;
64a8f92fd783e75 Christian König 2022-03-11 149 }
64a8f92fd783e75 Christian König 2022-03-11 150 }
64a8f92fd783e75 Christian König 2022-03-11 151
64a8f92fd783e75 Christian König 2022-03-11 152 if (f1 || f2) {
64a8f92fd783e75 Christian König 2022-03-11 153 pr_err("Not all fences seen!\n");
64a8f92fd783e75 Christian König 2022-03-11 @154 err = -EINVAL;
64a8f92fd783e75 Christian König 2022-03-11 155 }
64a8f92fd783e75 Christian König 2022-03-11 156
64a8f92fd783e75 Christian König 2022-03-11 157 dma_fence_signal(f1);
64a8f92fd783e75 Christian König 2022-03-11 158 dma_fence_signal(f2);
64a8f92fd783e75 Christian König 2022-03-11 159 dma_fence_put(array);
64a8f92fd783e75 Christian König 2022-03-11 160 return 0;
64a8f92fd783e75 Christian König 2022-03-11 161 }
64a8f92fd783e75 Christian König 2022-03-11 162
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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