From 844ccdd7dce2c1a6ea9b437fcf8c3265b136e4a5 Mon Sep 17 00:00:00 2001
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Date: Tue, 3 Oct 2017 16:51:47 -0700
Subject: rcu: Eliminate rcu_irq_enter_disabled()
Now that the irq path uses the rcu_nmi_{enter,exit}() algorithm,
rcu_irq_enter() and rcu_irq_exit() may be used from any context. There is
thus no need for rcu_irq_enter_disabled() and for the checks using it.
This commit therefore eliminates rcu_irq_enter_disabled().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/trace/trace.c | 11 -----------
1 file changed, 11 deletions(-)
(limited to 'kernel/trace')
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 73e67b6..dbce1be 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2682,17 +2682,6 @@ void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
if (unlikely(in_nmi()))
return;
- /*
- * It is possible that a function is being traced in a
- * location that RCU is not watching. A call to
- * rcu_irq_enter() will make sure that it is, but there's
- * a few internal rcu functions that could be traced
- * where that wont work either. In those cases, we just
- * do nothing.
- */
- if (unlikely(rcu_irq_enter_disabled()))
- return;
-
rcu_irq_enter_irqson();
__ftrace_trace_stack(buffer, flags, skip, pc, NULL);
rcu_irq_exit_irqson();
--
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