* [intel-tdx:guest 129/144] kernel/dma/swiotlb.c:389:15-33: WARNING: casting value returned by memory allocation function to (struct io_tlb_area *) is useless.
@ 2021-11-20 8:33 kernel test robot
2021-11-20 8:33 ` [PATCH] swiotlb: fix alloc_cast.cocci warnings kernel test robot
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2021-11-20 8:33 UTC (permalink / raw)
To: Andi Kleen; +Cc: kbuild-all, linux-kernel, Kuppuswamy Sathyanarayanan
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tree: https://github.com/intel/tdx.git guest
head: 41fe88a1b3c28543f49fa6ed9e0e9b6650ed7614
commit: 4529b5784c141782c72ec9bd9a92df2b68cb7d45 [129/144] swiotlb: Split up single swiotlb lock
config: x86_64-randconfig-c002-20211118 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
cocci warnings: (new ones prefixed by >>)
>> kernel/dma/swiotlb.c:389:15-33: WARNING: casting value returned by memory allocation function to (struct io_tlb_area *) is useless.
Please review and possibly fold the followup patch.
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH] swiotlb: fix alloc_cast.cocci warnings
2021-11-20 8:33 [intel-tdx:guest 129/144] kernel/dma/swiotlb.c:389:15-33: WARNING: casting value returned by memory allocation function to (struct io_tlb_area *) is useless kernel test robot
@ 2021-11-20 8:33 ` kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2021-11-20 8:33 UTC (permalink / raw)
To: Andi Kleen; +Cc: kbuild-all, linux-kernel, Kuppuswamy Sathyanarayanan
From: kernel test robot <lkp@intel.com>
kernel/dma/swiotlb.c:389:15-33: WARNING: casting value returned by memory allocation function to (struct io_tlb_area *) is useless.
Remove casting the values returned by memory allocation functions
like kmalloc, kzalloc, kmem_cache_alloc, kmem_cache_zalloc etc.
Semantic patch information:
This makes an effort to find cases of casting of values returned by
kmalloc, kzalloc, kcalloc, kmem_cache_alloc, kmem_cache_zalloc,
kmem_cache_alloc_node, kmalloc_node and kzalloc_node and removes
the casting as it is not required. The result in the patch case may
need some reformatting.
Generated by: scripts/coccinelle/api/alloc/alloc_cast.cocci
Fixes: 4529b5784c14 ("swiotlb: Split up single swiotlb lock")
CC: Andi Kleen <ak@linux.intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
---
tree: https://github.com/intel/tdx.git guest
head: 41fe88a1b3c28543f49fa6ed9e0e9b6650ed7614
commit: 4529b5784c141782c72ec9bd9a92df2b68cb7d45 [129/144] swiotlb: Split up single swiotlb lock
:::::: branch date: 9 days ago
:::::: commit date: 9 days ago
swiotlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -386,7 +386,7 @@ swiotlb_late_init_with_tbl(char *tlb, un
return -ENOMEM;
}
- mem->areas = (struct io_tlb_area *)kcalloc(num_areas,
+ mem->areas = kcalloc(num_areas,
sizeof(struct io_tlb_area),
GFP_KERNEL);
if (!mem->areas) {
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