It's a bit after 2.6.1 now...
Removes unnecessary if, uses 16 bit rotate left.
Performance improves ~30%
Signed-off-by: Joe Perches <[EMAIL PROTECTED]>
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 7c0b515..1c50f4c 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -925,15 +925,9 @@ static int atrtr_ioctl(unsigned int cmd, void __user *arg)
static unsigned long atalk_sum_partial(const unsigned char *data,
int len, unsigned long sum)
{
- /* This ought to be unwrapped neatly. I'll trust gcc for now */
while (len--) {
- sum += *data;
- sum <<= 1;
- if (sum & 0x10000) {
- sum++;
- sum &= 0xffff;
- }
- data++;
+ sum += *data++;
+ sum = ((sum & 0x8000)>>15) | ((sum & 0x7fff)<<1);
}
return sum;
}
-
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