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SubjectRe: Realtime Preemption, 2.6.12, Beginners Guide?
On Sat, 9 Jul 2005, Ingo Molnar wrote:

> this patch reduces ip_setsockopt's stack footprint from 572 bytes to 164
> bytes. (Note: needs review and testing as i could not excercise this
> multicast codepath.)

This patch breaks multicast source group joins. Here's the fix:

--- linux.old/net/ipv4/ip_sockglue.c 2005-07-11 01:50:19.000000000 -0700
+++ linux/net/ipv4/ip_sockglue.c 2005-07-11 13:54:34.000000000 -0700
@@ -738,7 +738,7 @@
break;
if (optlen != sizeof(struct group_source_req))
goto free_greqs_e_inval;
- if (copy_from_user(&greqs, optval, sizeof(*greqs))) {
+ if (copy_from_user(greqs, optval, sizeof(*greqs))) {
err = -EFAULT;
goto free_greqs_break;
}
Cheers,
--ww
-
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