Messages in this thread | | | Date | Thu, 5 Dec 2019 16:25:34 +0800 | From | kbuild test robot <> | Subject | include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2f13437b8917627119d163d62f73e7a78a92303a commit: 8259bf667a0f9ea1a37bb71c7af9ebd550e9251d spi: bcm2835: Speed up TX-only DMA transfers by clearing RX FIFO date: 3 months ago config: x86_64-randconfig-s0-20191205 (attached as .config) compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2 reproduce: git checkout 8259bf667a0f9ea1a37bb71c7af9ebd550e9251d # save the attached .config to linux build tree make ARCH=x86_64
If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@intel.com>
All warnings (new ones prefixed by >>):
In file included from drivers/spi/spi-bcm2835.c:19:0: drivers/spi/spi-bcm2835.c: In function 'dmaengine_desc_set_reuse': >> include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function [-Wuninitialized] if (caps.descriptor_reuse) { ^ -- In file included from drivers//spi/spi-bcm2835.c:19:0: drivers//spi/spi-bcm2835.c: In function 'dmaengine_desc_set_reuse': >> include/linux/dmaengine.h:1370:10: warning: 'caps.descriptor_reuse' is used uninitialized in this function [-Wuninitialized] if (caps.descriptor_reuse) { ^
vim +1370 include/linux/dmaengine.h
a8135d0d79e9d0 Peter Ujfalusi 2015-12-14 1363 272420214d261e Vinod Koul 2015-08-05 1364 static inline int dmaengine_desc_set_reuse(struct dma_async_tx_descriptor *tx) 272420214d261e Vinod Koul 2015-08-05 1365 { 272420214d261e Vinod Koul 2015-08-05 1366 struct dma_slave_caps caps; 272420214d261e Vinod Koul 2015-08-05 1367 272420214d261e Vinod Koul 2015-08-05 1368 dma_get_slave_caps(tx->chan, &caps); 272420214d261e Vinod Koul 2015-08-05 1369 272420214d261e Vinod Koul 2015-08-05 @1370 if (caps.descriptor_reuse) { 272420214d261e Vinod Koul 2015-08-05 1371 tx->flags |= DMA_CTRL_REUSE; 272420214d261e Vinod Koul 2015-08-05 1372 return 0; 272420214d261e Vinod Koul 2015-08-05 1373 } else { 272420214d261e Vinod Koul 2015-08-05 1374 return -EPERM; 272420214d261e Vinod Koul 2015-08-05 1375 } 272420214d261e Vinod Koul 2015-08-05 1376 } 272420214d261e Vinod Koul 2015-08-05 1377
:::::: The code at line 1370 was first introduced by commit :::::: 272420214d261e97f08a4c555defb3924de06ae8 dmaengine: Add DMA_CTRL_REUSE
:::::: TO: Vinod Koul <vinod.koul@intel.com> :::::: CC: Vinod Koul <vinod.koul@intel.com>
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