From: Muhammad Falak R Wani <falakreyaz@gmail.com>
Date: Sat, 30 Apr 2016 19:00:24 +0000 (+0530)
Subject: drm/amdgpu: Replace rcu_assign_pointer() with RCU_INIT_POINTER()
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=84fae133f0ccc974a425eee21101f5644bd8d14d;p=openwrt%2Fstaging%2Fblogic.git

drm/amdgpu: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

The rcu_assign_pointer() ensures that the initialization of a structure
is carried out before storing a pointer to that structre. It is always
safe to use RCU_INIT_POINTER() to NULL a pointer, instead of
rcu_assign_pointer().
This results in slightly smaller/faster code.

The following semantic patch was used:
<smpl>

@@
@@

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (..., NULL)

</smpl>

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index 50e95ab9615a..ba9c04283d01 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -198,7 +198,7 @@ void amdgpu_fence_process(struct amdgpu_ring *ring)
 
 		/* There is always exactly one thread signaling this fence slot */
 		fence = rcu_dereference_protected(*ptr, 1);
-		rcu_assign_pointer(*ptr, NULL);
+		RCU_INIT_POINTER(*ptr, NULL);
 
 		BUG_ON(!fence);