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[PATCH] sky2: ring distance optimization
author
Stephen Hemminger
<shemminger@osdl.org>
Fri, 9 Dec 2005 19:34:59 +0000
(11:34 -0800)
committer
Jeff Garzik
<jgarzik@pobox.com>
Mon, 12 Dec 2005 20:27:20 +0000
(15:27 -0500)
Faster way to compute ring distance.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
drivers/net/sky2.c
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diff --git
a/drivers/net/sky2.c
b/drivers/net/sky2.c
index eae270d81808f4240458480b8d6957ada8ea2917..2dd46a05fb30d26f13401e0940f6a571ba4b6952 100644
(file)
--- a/
drivers/net/sky2.c
+++ b/
drivers/net/sky2.c
@@
-1039,7
+1039,7
@@
err_out:
/* Modular subtraction in ring */
static inline int tx_dist(unsigned tail, unsigned head)
{
- return (head
>= tail ? head : head + TX_RING_SIZE) - tail
;
+ return (head
- tail) % TX_RING_SIZE
;
}
/* Number of list elements available for next tx */