Re: [PATCH] amdgpu/gmc : fix compile warning

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On 10/05/2018 01:14 AM, Koenig, Christian wrote:
Am 04.10.2018 um 20:52 schrieb Guenter Roeck:
Hi,

On Fri, Sep 14, 2018 at 06:05:52PM +0800, Peng Hao wrote:
drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c:
      In function ‘gmc_v8_0_process_interrupt’:
drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c:1447:10:
      warning: missing braces around initializer [-Wmissing-braces]

Signed-off-by: Peng Hao <peng.hao2@xxxxxxxxxx>
Was there any feedback on this patch ? The problem does affect us,
and we'll need a fix.

Well as discussed using "{ { 0 } }" is as wrong as using "{ 0 }".


Ah, sorry, I must have missed the discussion.

It is for sure not the best solution, but at least it compiles, and it seems
to be proliferating.

$ git grep "{ *{ *0 *} *}" | wc
    144    1180   11802
$ git grep "{ *{ *0 *} *}" drivers/gpu/drm/amd/ | wc
     50     459    5239

We should either use only "{ }" or even better make nails with heads and
use memset().

I'd rather leave it up to the compiler to decide what is most efficient.

Guenter


Christian.


---
   drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 2 +-
   drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 2 +-
   2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index 9333109..55f4755 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -1444,7 +1444,7 @@ static int gmc_v8_0_process_interrupt(struct amdgpu_device *adev,
   		gmc_v8_0_set_fault_enable_default(adev, false);
if (printk_ratelimit()) {
-		struct amdgpu_task_info task_info = { 0 };
+		struct amdgpu_task_info task_info = { {0} };
I wondered if
		struct amdgpu_task_info task_info = { };
would be better.

Thanks,
Guenter

   		amdgpu_vm_get_task_info(adev, entry->pasid, &task_info);
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 72f8018..e8b78c5 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -259,7 +259,7 @@ static int gmc_v9_0_process_interrupt(struct amdgpu_device *adev,
   	}
if (printk_ratelimit()) {
-		struct amdgpu_task_info task_info = { 0 };
+		struct amdgpu_task_info task_info = { {0} };
amdgpu_vm_get_task_info(adev, entry->pasid, &task_info);


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