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@xxxxxxxxxxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
Cc: Gustavo Padovan <gustavo@xxxxxxxxxxx>
---
include/linux/dma-fence.h | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
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);
}
/**
--
2.13.1
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