linux-kernel - [PATCH net-next 1/3] sock: dedup sock_def_write_space wmem

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Message-Id: <95d349fee6504dc8bc1e8123d80915d1fe9ce91a.1650891417.git.asml.silence@gmail.com>
Date:   Thu, 28 Apr 2022 11:58:17 +0100
From:   Pavel Begunkov <asml.silence@...il.com>
To:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        linux-kernel@...r.kernel.org,
        Pavel Begunkov <asml.silence@...il.com>
Subject: [PATCH net-next 1/3] sock: dedup sock_def_write_space wmem_alloc checks

Except for minor rounding differences the first ->sk_wmem_alloc test in
sock_def_write_space() is a hand coded version of sock_writeable().
Replace it with the helper, and also kill the following if duplicating
the check.

Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
---
 net/core/sock.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 29abec3eabd8..976ff871969e 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3194,15 +3194,14 @@ static void sock_def_write_space(struct sock *sk)
 	/* Do not wake up a writer until he can make "significant"
 	 * progress.  --DaveM
 	 */
-	if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= READ_ONCE(sk->sk_sndbuf)) {
+	if (sock_writeable(sk)) {
 		wq = rcu_dereference(sk->sk_wq);
 		if (skwq_has_sleeper(wq))
 			wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
 						EPOLLWRNORM | EPOLLWRBAND);
 
 		/* Should agree with poll, otherwise some programs break */
-		if (sock_writeable(sk))
-			sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 	}
 
 	rcu_read_unlock();
-- 
2.36.0