linux-kernel - [PATCH 32/32] net: Make softirq vector masking finegrained on release

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Date:   Tue, 12 Feb 2019 18:14:23 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Pavan Kondeti <pkondeti@...eaurora.org>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: [PATCH 32/32] net: Make softirq vector masking finegrained on release_sock()

This is a usage example of spin_lock_bh_mask(). NET_RX, TIMER and
TASKLET are the three softirqs that have been reported by lockdep to
be used for this socket lock, at least on my own usecases.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Mauro Carvalho Chehab <mchehab@...pensource.com>
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Pavan Kondeti <pkondeti@...eaurora.org>
Cc: Paul E . McKenney <paulmck@...ux.vnet.ibm.com>
Cc: David S . Miller <davem@...emloft.net>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 net/core/sock.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index 6aa2e7e0b4fb..24ca1cdacfe3 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2795,7 +2795,9 @@ EXPORT_SYMBOL(lock_sock_nested);
 
 void release_sock(struct sock *sk)
 {
-	spin_lock_bh(&sk->sk_lock.slock);
+	unsigned int bh;
+
+	bh = spin_lock_bh_mask(&sk->sk_lock.slock, BIT(NET_RX_SOFTIRQ) | BIT(TIMER_SOFTIRQ) | BIT(TASKLET_SOFTIRQ));
 	if (sk->sk_backlog.tail)
 		__release_sock(sk);
 
@@ -2808,7 +2810,7 @@ void release_sock(struct sock *sk)
 	sock_release_ownership(sk);
 	if (waitqueue_active(&sk->sk_lock.wq))
 		wake_up(&sk->sk_lock.wq);
-	spin_unlock_bh(&sk->sk_lock.slock);
+	spin_unlock_bh_mask(&sk->sk_lock.slock, bh);
 }
 EXPORT_SYMBOL(release_sock);
 
-- 
2.17.1