2022-10-07 20:12:15

by Colin Ian King

Subject: [PATCH] drm/i915/gem: remove redundant assignments to variable ret

The variable ret is being assigned with a value that is never read
both before and after a while-loop. The variable is being re-assigned
inside the while-loop and afterwards on the call to the function
i915_gem_object_lock_interruptible. Remove the redundants assignments.

Cleans up clang scan-build warnings:

warning: Although the value stored to 'ret' is used in the
enclosing expression, the value is never actually read
from 'ret' [deadcode.DeadStores]

warning: Value stored to 'ret' is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <[email protected]>
---
drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index d4398948f016..b7e24476a0fd 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -292,7 +292,7 @@ int i915_gem_object_userptr_submit_init(struct drm_i915_gem_object *obj)
if (!i915_gem_object_is_readonly(obj))
gup_flags |= FOLL_WRITE;

- pinned = ret = 0;
+ pinned = 0;
while (pinned < num_pages) {
ret = pin_user_pages_fast(obj->userptr.ptr + pinned * PAGE_SIZE,
num_pages - pinned, gup_flags,
@@ -302,7 +302,6 @@ int i915_gem_object_userptr_submit_init(struct drm_i915_gem_object *obj)

pinned += ret;
}
- ret = 0;

ret = i915_gem_object_lock_interruptible(obj, NULL);
if (ret)
--
2.37.3

2022-10-10 09:18:04

by Tvrtko Ursulin

Subject: Re: [PATCH] drm/i915/gem: remove redundant assignments to variable ret

On 07/10/2022 20:47, Colin Ian King wrote:
> The variable ret is being assigned with a value that is never read
> both before and after a while-loop. The variable is being re-assigned
> inside the while-loop and afterwards on the call to the function
> i915_gem_object_lock_interruptible. Remove the redundants assignments.
>
> Cleans up clang scan-build warnings:
>
> warning: Although the value stored to 'ret' is used in the
> enclosing expression, the value is never actually read
> from 'ret' [deadcode.DeadStores]
>
> warning: Value stored to 'ret' is never read [deadcode.DeadStores]
>
> Signed-off-by: Colin Ian King <[email protected]>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> index d4398948f016..b7e24476a0fd 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> @@ -292,7 +292,7 @@ int i915_gem_object_userptr_submit_init(struct drm_i915_gem_object *obj)
> if (!i915_gem_object_is_readonly(obj))
> gup_flags |= FOLL_WRITE;
>
> - pinned = ret = 0;
> + pinned = 0;
> while (pinned < num_pages) {
> ret = pin_user_pages_fast(obj->userptr.ptr + pinned * PAGE_SIZE,
> num_pages - pinned, gup_flags,
> @@ -302,7 +302,6 @@ int i915_gem_object_userptr_submit_init(struct drm_i915_gem_object *obj)
>
> pinned += ret;
> }
> - ret = 0;
>
> ret = i915_gem_object_lock_interruptible(obj, NULL);
> if (ret)

Reviewed-by: Tvrtko Ursulin <[email protected]>

Thanks for the cleanup, will merge.

Regards,

Tvrtko