Re: [PATCH] drm/amdgpu: allocate large structures dynamically

Am 05.05.20 um 16:01 schrieb Arnd Bergmann:

After the structure was padded to 1024 bytes, it is no longer suitable for being a local variable, as the function surpasses the warning limit for 32-bit architectures:

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:587:5: error: stack frame size of 1072 bytes in function 'amdgpu_ras_feature_enable' [-Werror,-Wframe-larger-than=] int amdgpu_ras_feature_enable(struct amdgpu_device *adev, ^

Use kzalloc() instead to get it from the heap.

Fixes: a0d254820f43 ("drm/amdgpu: update RAS TA to Host interface") Signed-off-by: Arnd Bergmann arnd@arndb.de

Acked-by: Christian König christian.koenig@amd.com

We have a bunch of those warnings in the DAL code as well.

Christian.

---

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 31 +++++++++++++++++-------- 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c index 538895cfd862..7348619253c7 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c @@ -588,19 +588,23 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev, struct ras_common_if *head, bool enable) { struct amdgpu_ras *con = amdgpu_ras_get_context(adev);

• union ta_ras_cmd_input info;

• union ta_ras_cmd_input *info; int ret;

  if (!con) return -EINVAL;

•    info = kzalloc(sizeof(union ta_ras_cmd_input), GFP_KERNEL);
  

• if (!info)

• return -ENOMEM;
  

• if (!enable) {

• info.disable_features = (struct ta_ras_disable_features_input) {
  

• info->disable_features = (struct ta_ras_disable_features_input) {
  .block_id =  amdgpu_ras_block_to_ta(head->block),
  .error_type = amdgpu_ras_error_to_ta(head->type),
  

  }; } else {

• info.enable_features = (struct ta_ras_enable_features_input) {
  

• info->enable_features = (struct ta_ras_enable_features_input) {
  .block_id =  amdgpu_ras_block_to_ta(head->block),
  .error_type = amdgpu_ras_error_to_ta(head->type),
  

  };

@@ -609,26 +613,33 @@ int amdgpu_ras_feature_enable(struct amdgpu_device *adev, /* Do not enable if it is not allowed. */ WARN_ON(enable && !amdgpu_ras_is_feature_allowed(adev, head)); /* Are we alerady in that state we are going to set? */

• if (!(!!enable ^ !!amdgpu_ras_is_feature_enabled(adev, head)))

• return 0;
  

• if (!(!!enable ^ !!amdgpu_ras_is_feature_enabled(adev, head))) {

• ret = 0;
  

• goto out;
  

• }

  if (!amdgpu_ras_intr_triggered()) {

• ret = psp_ras_enable_features(&adev->psp, &info, enable);
  

• ret = psp_ras_enable_features(&adev->psp, info, enable);
  

  if (ret) { amdgpu_ras_parse_status_code(adev, enable ? "enable":"disable", ras_block_str(head->block), (enum ta_ras_status)ret); if (ret == TA_RAS_STATUS__RESET_NEEDED)

• 		return -EAGAIN;
  

• 	return -EINVAL;
  

• 		ret = -EAGAIN;
  

• 	else
  

• 		ret = -EINVAL;
  

• 	goto out;
  

  } }

  /* setup the obj */ __amdgpu_ras_feature_enable(adev, head, enable);

• return 0;

• ret = 0;

+out:

• kfree(info);

• return ret; }

  /* Only used in device probe stage and called only once. */