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From bbc9bce319ef971d0c88222a029b6d17a0e1dddb Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <natechancellor@gmail.com>
Date: Mon, 1 Oct 2018 23:41:24 -0700
Subject: [PATCH 1275/2940] drm/scheduler: Simplify spsc_queue_count check in
drm_sched_entity_select_rq
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Clang generates a warning when it sees a logical not followed by a
conditional operator like ==, >, or <.
drivers/gpu/drm/scheduler/sched_entity.c:470:6: warning: logical not is
only applied to the left hand side of this comparison
[-Wlogical-not-parentheses]
if (!spsc_queue_count(&entity->job_queue) == 0 ||
^ ~~
drivers/gpu/drm/scheduler/sched_entity.c:470:6: note: add parentheses
after the '!' to evaluate the comparison first
if (!spsc_queue_count(&entity->job_queue) == 0 ||
^
( )
drivers/gpu/drm/scheduler/sched_entity.c:470:6: note: add parentheses
around left hand side expression to silence this warning
if (!spsc_queue_count(&entity->job_queue) == 0 ||
^
( )
1 warning generated.
It assumes the author might have made a mistake in their logic:
if (!a == b) -> if (!(a == b))
Sometimes that is the case; other times, it's just a super convoluted
way of saying 'if (a)' when b = 0:
if (!1 == 0) -> if (0 == 0) -> if (true)
Alternatively:
if (!1 == 0) -> if (!!1) -> if (1)
Simplify this comparison so that Clang doesn't complain.
Fixes: 35e160e781a0 ("drm/scheduler: change entities rq even earlier")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/scheduler/sched_entity.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
index 26db90635a7d..4463d3826ecb 100644
--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -473,8 +473,7 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity)
struct dma_fence *fence;
struct drm_sched_rq *rq;
- if (!spsc_queue_count(&entity->job_queue) == 0 ||
- entity->num_rq_list <= 1)
+ if (spsc_queue_count(&entity->job_queue) || entity->num_rq_list <= 1)
return;
fence = READ_ONCE(entity->last_scheduled);
--
2.17.1
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