Re: [PATCH] drm/amdgpu: remove redundant memset
On 08/29/2018 11:17 PM, Philip Yang wrote: kvmalloc_array uses __GFP_ZERO flag ensures that the returned address is zeroed already, memset it to zero again afterwards is unnecessary, and in this case buggy because we only clear the first entry. Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang Good catch. Reviewed-by: Junwei Zhang --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
Re: [PATCH] drm/amdgpu: remove redundant memset
Reviewed-by: Alex Deucher From: amd-gfx on behalf of Philip Yang Sent: Wednesday, August 29, 2018 11:17:44 AM To: amd-gfx@lists.freedesktop.org Cc: Yang, Philip Subject: [PATCH] drm/amdgpu: remove redundant memset kvmalloc_array uses __GFP_ZERO flag ensures that the returned address is zeroed already, memset it to zero again afterwards is unnecessary, and in this case buggy because we only clear the first entry. Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; -- 2.7.4 ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
[PATCH] drm/amdgpu: remove redundant memset
kvmalloc_array uses __GFP_ZERO flag ensures that the returned address is zeroed already, memset it to zero again afterwards is unnecessary, and in this case buggy because we only clear the first entry. Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; -- 2.7.4 ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
Re: [PATCH] drm/amdgpu: remove redundant memset
Am 29.08.2018 um 17:13 schrieb Philip Yang: kvmalloc_array uses __GFP_ZERO flag ensures that the returned address is zeroed already, memset it to zero again afterwards is unnecessary and in this case buggy because we only clear the first entry. Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang Reviewed-by: Christian König --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
[PATCH] drm/amdgpu: remove redundant memset
kvmalloc_array uses __GFP_ZERO flag ensures that the returned address is zeroed already, memset it to zero again afterwards is unnecessary Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; -- 2.7.4 ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
Re: [PATCH] drm/amdgpu: remove redundant memset
Am 29.08.2018 um 17:01 schrieb Philip Yang: Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang You need to add a commit message, explaining why that can be removed. With that done the patch is Reviewed-by: Christian König . Regards, Christian. --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
[PATCH] drm/amdgpu: remove redundant memset
Change-Id: If94a59d3cbf2690dd2a1e2add71bc393df6a9686 Signed-off-by: Philip Yang --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 153c9be..33d9ce2 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -540,7 +540,6 @@ static int amdgpu_vm_alloc_levels(struct amdgpu_device *adev, GFP_KERNEL | __GFP_ZERO); if (!parent->entries) return -ENOMEM; - memset(parent->entries, 0 , sizeof(struct amdgpu_vm_pt)); } from = saddr >> shift; -- 2.7.4 ___ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
