[xlnx:master 385/410] drivers/staging/apf/xilinx-dma-apf.c:960:10: warning: 'attrs' may be used uninitialized in this function
kbuild test robot
fengguang.wu at intel.com
Wed Mar 1 10:02:49 PST 2017
tree: https://github.com/Xilinx/linux-xlnx master
head: 1aacedaf5318e8ae39cc02916647495c1c2992ab
commit: d41696969cb3eb5be69777c0a8cf2a5cc8dae03b [385/410] staging: apf: Updating apf driver for 4.9 kernel version
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout d41696969cb3eb5be69777c0a8cf2a5cc8dae03b
# save the attached .config to linux build tree
make.cross ARCH=arm
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
drivers/staging/apf/xilinx-dma-apf.c: In function 'xdma_wait':
>> drivers/staging/apf/xilinx-dma-apf.c:960:10: warning: 'attrs' may be used uninitialized in this function [-Wmaybe-uninitialized]
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
--
drivers/staging/apf/xlnk.c: In function 'xlnk_memop_ioctl.constprop':
>> drivers/staging/apf/xlnk.c:1595:44: warning: 'cacheable' may be used uninitialized in this function [-Wmaybe-uninitialized]
if (args.memop.flags & XLNK_FLAG_COHERENT || !cacheable) {
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
>> drivers/staging/apf/xlnk.c:1663:4: warning: 'cp' may be used uninitialized in this function [-Wmaybe-uninitialized]
dma_buf_detach(cp->dbuf, cp->dbuf_attach);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/attrs +960 drivers/staging/apf/xilinx-dma-apf.c
944 *operating_flags |= XDMA_FLAGS_WAIT_COMPLETE;
945 } else {
946 wait_for_completion(&dmahead->cmp);
947 *operating_flags |= XDMA_FLAGS_WAIT_COMPLETE;
948 }
949 }
950
951 if (dmahead->dmabuf) {
952 dma_buf_unmap_attachment(dmahead->dmabuf->dbuf_attach,
953 dmahead->dmabuf->dbuf_sg_table,
954 dmahead->dmabuf->dma_direction);
955 kfree(dmahead->dmabuf->sg_list);
956 dma_buf_detach(dmahead->dmabuf->dbuf,
957 dmahead->dmabuf->dbuf_attach);
958 } else {
959 if (!(user_flags & CF_FLAG_CACHE_FLUSH_INVALIDATE))
> 960 attrs |= DMA_ATTR_SKIP_CPU_SYNC;
961
962 get_dma_ops(chan->dev)->unmap_sg(chan->dev,
963 dmahead->sglist,
964 dmahead->sgcnt,
965 dmahead->dmadir,
966 attrs);
967 if (!(user_flags & CF_FLAG_PHYSICALLY_CONTIGUOUS))
968 unpin_user_pages(dmahead->sglist, dmahead->sgcnt);
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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