diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/024-2-tcp-tsq-remove-one-locked-operation-in-tcp_wfree.patch')
-rw-r--r-- | target/linux/generic/backport-4.9/024-2-tcp-tsq-remove-one-locked-operation-in-tcp_wfree.patch | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/target/linux/generic/backport-4.9/024-2-tcp-tsq-remove-one-locked-operation-in-tcp_wfree.patch b/target/linux/generic/backport-4.9/024-2-tcp-tsq-remove-one-locked-operation-in-tcp_wfree.patch deleted file mode 100644 index af194b2bed..0000000000 --- a/target/linux/generic/backport-4.9/024-2-tcp-tsq-remove-one-locked-operation-in-tcp_wfree.patch +++ /dev/null @@ -1,48 +0,0 @@ -From 408f0a6c21e124cc4f6c7aa370b38aa47e55428d Mon Sep 17 00:00:00 2001 -From: Eric Dumazet <edumazet@google.com> -Date: Sat, 3 Dec 2016 11:14:51 -0800 -Subject: [PATCH 02/10] tcp: tsq: remove one locked operation in tcp_wfree() - -Instead of atomically clear TSQ_THROTTLED and atomically set TSQ_QUEUED -bits, use one cmpxchg() to perform a single locked operation. - -Since the following patch will also set TCP_TSQ_DEFERRED here, -this cmpxchg() will make this addition free. - -Signed-off-by: Eric Dumazet <edumazet@google.com> -Signed-off-by: David S. Miller <davem@davemloft.net> ---- - net/ipv4/tcp_output.c | 13 ++++++++++--- - 1 file changed, 10 insertions(+), 3 deletions(-) - ---- a/net/ipv4/tcp_output.c -+++ b/net/ipv4/tcp_output.c -@@ -865,6 +865,7 @@ void tcp_wfree(struct sk_buff *skb) - { - struct sock *sk = skb->sk; - struct tcp_sock *tp = tcp_sk(sk); -+ unsigned long flags, nval, oval; - int wmem; - - /* Keep one reference on sk_wmem_alloc. -@@ -882,11 +883,17 @@ void tcp_wfree(struct sk_buff *skb) - if (wmem >= SKB_TRUESIZE(1) && this_cpu_ksoftirqd() == current) - goto out; - -- if (test_and_clear_bit(TSQ_THROTTLED, &tp->tsq_flags) && -- !test_and_set_bit(TSQ_QUEUED, &tp->tsq_flags)) { -- unsigned long flags; -+ for (oval = READ_ONCE(tp->tsq_flags);; oval = nval) { - struct tsq_tasklet *tsq; - -+ if (!(oval & TSQF_THROTTLED) || (oval & TSQF_QUEUED)) -+ goto out; -+ -+ nval = (oval & ~TSQF_THROTTLED) | TSQF_QUEUED; -+ nval = cmpxchg(&tp->tsq_flags, oval, nval); -+ if (nval != oval) -+ continue; -+ - /* queue this socket to tasklet queue */ - local_irq_save(flags); - tsq = this_cpu_ptr(&tsq_tasklet); |