On 5/20/19 12:41 PM, Alex Deucher wrote:
> On Fri, May 17, 2019 at 8:43 AM xiaolinkui <xiaolinkui@xxxxxxxxxx> wrote:
>>
>> Use struct_size() helper to keep code simple.
>>
Again, this is not the reason why this helper was created.
>> Signed-off-by: xiaolinkui <xiaolinkui@xxxxxxxxxx>
>> ---
>> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 3 +--
>> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> This patch results in the following build error:
> DESCEND objtool
> CALL scripts/checksyscalls.sh
> CHK include/generated/compile.h
> CC [M] drivers/gpu/drm/amd/amdgpu/amdgpu_ras.o
> In file included from ./include/linux/kernel.h:15,
> from ./include/linux/list.h:9,
> from ./include/linux/wait.h:7,
> from ./include/linux/wait_bit.h:8,
> from ./include/linux/fs.h:6,
> from ./include/linux/debugfs.h:15,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:24:
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c: In function ‘amdgpu_ras_init’:
> ./include/linux/build_bug.h:16:45: error: negative width in bit-field
> ‘<anonymous>’
> #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
> ^
> ./include/linux/compiler.h:349:28: note: in expansion of macro
> ‘BUILD_BUG_ON_ZERO’
> #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
> ^~~~~~~~~~~~~~~~~
> ./include/linux/overflow.h:306:30: note: in expansion of macro ‘__must_be_array’
> sizeof(*(p)->member) + __must_be_array((p)->member),\
> ^~~~~~~~~~~~~~~
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1556:16: note: in expansion of
> macro ‘struct_size’
> con = kmalloc(struct_size(con, objs, AMDGPU_RAS_BLOCK_COUNT),
> ^~~~~~~~~~~
> make[4]: *** [scripts/Makefile.build:276:
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> make[3]: *** [scripts/Makefile.build:492: drivers/gpu/drm/amd/amdgpu] Error 2
> make[3]: *** Waiting for unfinished jobs....
> make[2]: *** [scripts/Makefile.build:492: drivers/gpu/drm] Error 2
> make[1]: *** [scripts/Makefile.build:492: drivers/gpu] Error 2
> make: *** [Makefile:1042: drivers] Error 2
>
> Alex
>
You continue[1][2] sending these sorts of patches without really understanding what
you are doing. And you don't even compile them. Why?
--
Gustavo
[1] https://lore.kernel.org/lkml/d83390a9-33be-3d76-3e23-b97f0a05b72f@xxxxxxxxx/
[2] https://lore.kernel.org/lkml/b4d33107-75d5-fa18-536e-6d21c96e4972@xxxxxxxxx/
>
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
>> index 22bd21e..4717a64 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
>> @@ -1375,8 +1375,7 @@ int amdgpu_ras_init(struct amdgpu_device *adev)
>> if (con)
>> return 0;
>>
>> - con = kmalloc(sizeof(struct amdgpu_ras) +
>> - sizeof(struct ras_manager) * AMDGPU_RAS_BLOCK_COUNT,
>> + con = kmalloc(struct_size(con, objs, AMDGPU_RAS_BLOCK_COUNT),
>> GFP_KERNEL|__GFP_ZERO);
>> if (!con)
>> return -ENOMEM;
>> --
>> 2.7.4
>>
>>
>>
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>> amd-gfx@xxxxxxxxxxxxxxxxxxxxx
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