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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2017-06-29 13:59:24 +0100 |
|---|---|---|
| committer |   Gustavo Padovan <gustavo.padovan@collabora.com> | 2017-06-29 18:51:07 -0300 |
| commit | 8111477663813caa1a4469cfe6afaae36cd04513 (patch) | |
| tree | c287a1d0472dfaecffa2261d9381ebd14a42be6e /include/linux/dma-fence.h | |
| parent | drm/gma500: remove an unneeded NULL check (diff) | |
| download | wireguard-linux-8111477663813caa1a4469cfe6afaae36cd04513.tar.xz wireguard-linux-8111477663813caa1a4469cfe6afaae36cd04513.zip | |
dma-buf/dma-fence: Extract __dma_fence_is_later()
Often we have the task of comparing two seqno known to be on the same
context, so provide a common __dma_fence_is_later().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629125930.821-1-chris@chris-wilson.co.uk
Diffstat (limited to 'include/linux/dma-fence.h')
| -rw-r--r-- | include/linux/dma-fence.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index a5195a7d6f77..ac5987989e9a 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -336,6 +336,19 @@ dma_fence_is_signaled(struct dma_fence *fence) } /** + * __dma_fence_is_later - return if f1 is chronologically later than f2 + * @f1: [in] the first fence's seqno + * @f2: [in] the second fence's seqno from the same context + * + * Returns true if f1 is chronologically later than f2. Both fences must be + * from the same context, since a seqno is not common across contexts. + */ +static inline bool __dma_fence_is_later(u32 f1, u32 f2) +{ + return (int)(f1 - f2) > 0; +} + +/** * dma_fence_is_later - return if f1 is chronologically later than f2 * @f1: [in] the first fence from the same context * @f2: [in] the second fence from the same context @@ -349,7 +362,7 @@ static inline bool dma_fence_is_later(struct dma_fence *f1, if (WARN_ON(f1->context != f2->context)) return false; - return (int)(f1->seqno - f2->seqno) > 0; + return __dma_fence_is_later(f1->seqno, f2->seqno); } /** |