[openeuler:openEuler-1.0-LTS 1941/1941] drivers/dma/pl330.c:2599:15: warning: 'src' may be used uninitialized in this function

[openeuler:openEuler-1.0-LTS 1941/1941] drivers/dma/pl330.c:2599:15: warning: 'src' may be used uninitialized in this function

[kernel test robot]

:::::: 
:::::: Manual check reason: "likely FALSE maybe-used-uninitialized warning on old compiler"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
TO: kernel@openeuler.org

Hi Frank,

First bad commit (maybe != root cause):

tree:   https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS
head:   df8d11fbcbb07177c2500e63d7f5a36063977596
commit: 0299853c014aa0eecf7fb85ac2f1ebd0a9a6ba73 [1941/1941] dmaengine: fix is_slave_direction() return false when DMA_DEV_TO_DEV
:::::: branch date: 17 hours ago
:::::: commit date: 1 year, 9 months ago
config: arm64-randconfig-002-20251212 (https://download.01.org/0day-ci/archive/20251213/202512130409.sZE93fMA-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251213/202512130409.sZE93fMA-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202512130409.sZE93fMA-lkp@intel.com/

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/dma/pl330.c: In function 'pl330_prep_dma_cyclic':
>> drivers/dma/pl330.c:2599:15: warning: 'src' may be used uninitialized in this function [-Wmaybe-uninitialized]
     px->src_addr = src;
     ~~~~~~~~~~~~~^~~~~
   drivers/dma/pl330.c:2657:13: note: 'src' was declared here
     dma_addr_t src;
                ^~~
>> drivers/dma/pl330.c:2598:15: warning: 'dst' may be used uninitialized in this function [-Wmaybe-uninitialized]
     px->dst_addr = dst;
     ~~~~~~~~~~~~~^~~~~
   drivers/dma/pl330.c:2656:13: note: 'dst' was declared here
     dma_addr_t dst;
                ^~~
   drivers/dma/pl330.c:297: warning: cannot understand function prototype: 'struct pl330_reqcfg '


vim +/src +2599 drivers/dma/pl330.c

b3040e40675ec2 Jassi Brar 2010-05-23  2593  
b3040e40675ec2 Jassi Brar 2010-05-23  2594  static inline void fill_px(struct pl330_xfer *px,
b3040e40675ec2 Jassi Brar 2010-05-23  2595  		dma_addr_t dst, dma_addr_t src, size_t len)
b3040e40675ec2 Jassi Brar 2010-05-23  2596  {
b3040e40675ec2 Jassi Brar 2010-05-23  2597  	px->bytes = len;
b3040e40675ec2 Jassi Brar 2010-05-23 @2598  	px->dst_addr = dst;
b3040e40675ec2 Jassi Brar 2010-05-23 @2599  	px->src_addr = src;
b3040e40675ec2 Jassi Brar 2010-05-23  2600  }
b3040e40675ec2 Jassi Brar 2010-05-23  2601  

:::::: The code at line 2599 was first introduced by commit
:::::: b3040e40675ec2c43542331cd30d4ee3dae797e8 DMA: PL330: Add dma api driver

:::::: TO: Jassi Brar <jassi.brar@samsung.com>
:::::: CC: Dan Williams <dan.j.williams@intel.com>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki