From: Peter Zijlstra <peterz@infradead.org>
To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
rostedt@goodmis.org
Cc: peterz@infradead.org, mingo@kernel.org, joel@joelfernandes.org,
gregkh@linuxfoundation.org, gustavo@embeddedor.com,
tglx@linutronix.de, paulmck@kernel.org, josh@joshtriplett.org,
mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com
Subject: [PATCH 8/8] tracing: Remove regular RCU context for _rcuidle tracepoints (again)
Date: Wed, 12 Feb 2020 10:32:18 +0100 [thread overview]
Message-ID: <20200212094108.063885035@infradead.org> (raw)
In-Reply-To: 20200212093210.468391728@infradead.org
Effectively revert commit 865e63b04e9b2 ("tracing: Add back in
rcu_irq_enter/exit_irqson() for rcuidle tracepoints") now that we've
taught perf how to deal with not having an RCU context provided.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
include/linux/tracepoint.h | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -179,10 +179,8 @@ static inline struct tracepoint *tracepo
* For rcuidle callers, use srcu since sched-rcu \
* doesn't work from the idle path. \
*/ \
- if (rcuidle) { \
+ if (rcuidle) \
__idx = srcu_read_lock_notrace(&tracepoint_srcu);\
- rcu_irq_enter_irqsave(); \
- } \
\
it_func_ptr = rcu_dereference_raw((tp)->funcs); \
\
@@ -194,10 +192,8 @@ static inline struct tracepoint *tracepo
} while ((++it_func_ptr)->func); \
} \
\
- if (rcuidle) { \
- rcu_irq_exit_irqsave(); \
+ if (rcuidle) \
srcu_read_unlock_notrace(&tracepoint_srcu, __idx);\
- } \
\
preempt_enable_notrace(); \
} while (0)
next prev parent reply other threads:[~2020-02-12 9:44 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 9:32 [PATCH 0/8] tracing vs rcu vs nmi Peter Zijlstra
2020-02-12 9:32 ` [PATCH 1/8] rcu: Rename rcu_irq_{enter,exit}_irqson() Peter Zijlstra
2020-02-12 9:32 ` [PATCH 2/8] rcu: Mark rcu_dynticks_curr_cpu_in_eqs() inline Peter Zijlstra
2020-02-12 9:32 ` [PATCH 3/8] rcu,tracing: Create trace_rcu_{enter,exit}() Peter Zijlstra
2020-02-12 9:32 ` [PATCH 4/8] sched,rcu,tracing: Mark preempt_count_{add,sub}() notrace Peter Zijlstra
2020-02-12 14:24 ` Steven Rostedt
2020-02-12 15:02 ` Peter Zijlstra
2020-02-12 15:14 ` Steven Rostedt
2020-02-12 15:38 ` Peter Zijlstra
2020-02-12 9:32 ` [PATCH 5/8] x86,tracing: Mark debug_stack_{set_zero,reset)() notrace Peter Zijlstra
2020-02-12 14:25 ` Steven Rostedt
2020-02-12 15:04 ` Peter Zijlstra
2020-02-12 15:18 ` Steven Rostedt
2020-02-12 15:39 ` Peter Zijlstra
2020-02-12 9:32 ` [PATCH 6/8] perf,tracing: Prepare the perf-trace interface for RCU changes Peter Zijlstra
2020-02-12 14:26 ` Steven Rostedt
2020-02-12 15:07 ` Mathieu Desnoyers
2020-02-12 9:32 ` [PATCH 7/8] tracing: Employ trace_rcu_{enter,exit}() Peter Zijlstra
2020-02-12 9:32 ` Peter Zijlstra [this message]
2020-02-12 14:29 ` [PATCH 8/8] tracing: Remove regular RCU context for _rcuidle tracepoints (again) Steven Rostedt
2020-02-12 15:12 ` Peter Zijlstra
2020-02-12 10:01 ` [PATCH 0/8] tracing vs rcu vs nmi Peter Zijlstra
2020-02-12 10:56 ` Will Deacon
2020-02-12 11:58 ` Peter Zijlstra
2020-02-12 14:32 ` Steven Rostedt
2020-02-12 15:21 ` Peter Zijlstra
2020-02-12 10:03 ` Peter Zijlstra
2020-02-12 10:07 ` Peter Zijlstra
2020-02-12 10:09 ` Peter Zijlstra
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