Re: [PATCH][next] amd/amdgpu_ctx: Use struct_size() helper and kmalloc()

From: Christian König
Date: Fri Oct 09 2020 - 03:09:01 EST


Am 08.10.20 um 16:34 schrieb Gustavo A. R. Silva:
Make use of the new struct_size() helper instead of the offsetof() idiom.
Also, use kmalloc() instead of kcalloc().

Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
index c80d8339f58c..5be125f3b92a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -100,7 +100,7 @@ static int amdgpu_ctx_init_entity(struct amdgpu_ctx *ctx, u32 hw_ip,
enum drm_sched_priority priority;
int r;
- entity = kcalloc(1, offsetof(typeof(*entity), fences[amdgpu_sched_jobs]),
+ entity = kmalloc(struct_size(entity, fences, amdgpu_sched_jobs),

NAK. You could use kzalloc() here, but kmalloc won't zero initialize the memory which could result in unforeseen consequences.

Christian.

GFP_KERNEL);
if (!entity)
return -ENOMEM;