From: Sven Schnelle <svens@linux.ibm.com>
Date: Thu, 10 Sep 2020 10:24:53 +0000 (+0200)
Subject: lockdep: fix order in trace_hardirqs_off_caller()
X-Git-Tag: v4.19.149~35
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=aafa75ff39d05ad8011c1b8fa118c36acec9661a;p=users%2Fdwmw2%2Flinux.git

lockdep: fix order in trace_hardirqs_off_caller()

[ Upstream commit 73ac74c7d489756d2313219a108809921dbfaea1 ]

Switch order so that locking state is consistent even
if the IRQ tracer calls into lockdep again.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/kernel/trace/trace_preemptirq.c b/kernel/trace/trace_preemptirq.c
index 71f553cceb3c1..0e373cb0106bb 100644
--- a/kernel/trace/trace_preemptirq.c
+++ b/kernel/trace/trace_preemptirq.c
@@ -59,14 +59,14 @@ EXPORT_SYMBOL(trace_hardirqs_on_caller);
 
 __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
 {
+	lockdep_hardirqs_off(CALLER_ADDR0);
+
 	if (!this_cpu_read(tracing_irq_cpu)) {
 		this_cpu_write(tracing_irq_cpu, 1);
 		tracer_hardirqs_off(CALLER_ADDR0, caller_addr);
 		if (!in_nmi())
 			trace_irq_disable_rcuidle(CALLER_ADDR0, caller_addr);
 	}
-
-	lockdep_hardirqs_off(CALLER_ADDR0);
 }
 EXPORT_SYMBOL(trace_hardirqs_off_caller);
 #endif /* CONFIG_TRACE_IRQFLAGS */