tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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[NET]: Prefetch dev->qdisc_lock in dev_queue_xmit()

We know the lock is going to be taken.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

authored by Eric Dumazet and committed by David S. Miller 2d7ceece bc8dfcb9

+2
unified split
+2
net/core/dev.c
··· 1259 1259 if (skb_checksum_help(skb, 0)) 1260 1260 goto out_kfree_skb; 1261 1261 1262 + spin_lock_prefetch(&dev->queue_lock); 1263 + 1262 1264 /* Disable soft irqs for various locks below. Also 1263 1265 * stops preemption for RCU. 1264 1266 */