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Date: Fri, 5 May 2023 19:33:10 +0800
From: Liu Jian <liujian56@...wei.com>
To: <corbet@....net>, <paulmck@...nel.org>, <frederic@...nel.org>,
<quic_neeraju@...cinc.com>, <joel@...lfernandes.org>,
<josh@...htriplett.org>, <boqun.feng@...il.com>, <rostedt@...dmis.org>,
<mathieu.desnoyers@...icios.com>, <jiangshanlai@...il.com>,
<qiang1.zhang@...el.com>, <jstultz@...gle.com>, <tglx@...utronix.de>,
<sboyd@...nel.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
<kuba@...nel.org>, <pabeni@...hat.com>, <peterz@...radead.org>,
<frankwoo@...gle.com>, <Rhinewuwu@...gle.com>
CC: <liujian56@...wei.com>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <rcu@...r.kernel.org>,
<netdev@...r.kernel.org>
Subject: [PATCH 4/9] softirq: Allow early break
From: Peter Zijlstra <peterz@...radead.org>
Allow terminating the softirq processing loop without finishing the
vectors.
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Liu Jian <liujian56@...wei.com>
---
kernel/softirq.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 48a81d8ae49a..e2cad5d108c8 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -582,6 +582,9 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
prev_count, preempt_count());
preempt_count_set(prev_count);
}
+
+ if (pending && __softirq_needs_break(start))
+ break;
}
if (!IS_ENABLED(CONFIG_PREEMPT_RT) &&
@@ -590,13 +593,14 @@ asmlinkage __visible void __softirq_entry __do_softirq(void)
local_irq_disable();
- pending = local_softirq_pending();
- if (pending) {
- if (!__softirq_needs_break(start) && --max_restart)
- goto restart;
+ if (pending)
+ or_softirq_pending(pending);
+ else if ((pending = local_softirq_pending()) &&
+ !__softirq_needs_break(start) &&
+ --max_restart)
+ goto restart;
- wakeup_softirqd();
- }
+ wakeup_softirqd();
account_softirq_exit(current);
lockdep_softirq_end(in_hardirq);
--
2.34.1
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