8:52 p.m.
tree: https://github.com/jgunthorpe/linux iommufd
head: 6b5b3f20ed6b64824c2d447b4f4555fcb390bf3b
commit: ae38950aefd81c9648c5416ec4a5003e4ec03e42 [18/31] drm/tegra: Use the iommu
dma_owner mechanism
config: arm-randconfig-c002-20220210
(https://download.01.org/0day-ci/archive/20220216/202202160335.Mb5DqLiM-lk...)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project
e8bff9ae54a55b4dbfeb6ba55f723abbd81bf494)
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 arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
#
https://github.com/jgunthorpe/linux/commit/ae38950aefd81c9648c5416ec4a500...
git remote add jgunthorpe https://github.com/jgunthorpe/linux
git fetch --no-tags jgunthorpe iommufd
git checkout ae38950aefd81c9648c5416ec4a5003e4ec03e42
# save the config file to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
clang-analyzer
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <yujie.liu(a)intel.com>
clang-analyzer warnings: (new ones prefixed by >>)
> drivers/gpu/drm/tegra/drm.c:998:23: warning: Value stored to
'domain' during its initialization is never read
[clang-analyzer-deadcode.DeadStores]
struct iommu_domain *domain =
iommu_get_domain_for_dev(client->dev);
^~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/domain +998 drivers/gpu/drm/tegra/drm.c
0c407de5ed1a329 Thierry Reding 2018-05-04 995
aacdf19849734d1 Thierry Reding 2019-02-08 996 void host1x_client_iommu_detach(struct
host1x_client *client)
0c407de5ed1a329 Thierry Reding 2018-05-04 997 {
ae38950aefd81c9 Jason Gunthorpe 2021-11-18 @998 struct iommu_domain *domain =
iommu_get_domain_for_dev(client->dev);
608f43ad27ab267 Thierry Reding 2019-12-02 999 struct drm_device *drm =
dev_get_drvdata(client->host);
0c407de5ed1a329 Thierry Reding 2018-05-04 1000 struct tegra_drm *tegra =
drm->dev_private;
0c407de5ed1a329 Thierry Reding 2018-05-04 1001
aacdf19849734d1 Thierry Reding 2019-02-08 1002 if (client->group) {
ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1003
iommu_detach_device_shared(tegra->domain, client->dev);
ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1004
iommu_device_release_dma_owner(client->dev,
ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1005 DMA_OWNER_PRIVATE_DOMAIN);
fa6661b7aa0b520 Thierry Reding 2019-10-28 1006 client->group = NULL;
ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1007 } else {
ae38950aefd81c9 Jason Gunthorpe 2021-11-18 1008
iommu_device_release_dma_owner(client->dev, DMA_OWNER_DMA_API);
0c407de5ed1a329 Thierry Reding 2018-05-04 1009 }
0c407de5ed1a329 Thierry Reding 2018-05-04 1010 }
0c407de5ed1a329 Thierry Reding 2018-05-04 1011
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org