[patch V2 06/29] latency_top: Simplify stack trace handling

From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
	x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Alexander Potapenko <glider@google.com>,
	Alexey Dobriyan <adobriyan@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Pekka Enberg <penberg@kernel.org>,
	linux-mm@kvack.org, David Rientjes <rientjes@google.com>,
	Christoph Lameter <cl@linux.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Dmitry Vyukov <dvyukov@google.com>,
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	Jani Nikula <jani.nikula@linux.intel.com>,
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	linux-arch@vger.kernel.org
Subject: [patch V2 06/29] latency_top: Simplify stack trace handling
Date: Thu, 18 Apr 2019 10:41:25 +0200	[thread overview]
Message-ID: <20190418084253.628227766@linutronix.de> (raw)
In-Reply-To: 20190418084119.056416939@linutronix.de

Replace the indirection through struct stack_trace with an invocation of
the storage array based interface.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 kernel/latencytop.c |   17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -141,20 +141,6 @@ account_global_scheduler_latency(struct
 	memcpy(&latency_record[i], lat, sizeof(struct latency_record));
 }
 
-/*
- * Iterator to store a backtrace into a latency record entry
- */
-static inline void store_stacktrace(struct task_struct *tsk,
-					struct latency_record *lat)
-{
-	struct stack_trace trace;
-
-	memset(&trace, 0, sizeof(trace));
-	trace.max_entries = LT_BACKTRACEDEPTH;
-	trace.entries = &lat->backtrace[0];
-	save_stack_trace_tsk(tsk, &trace);
-}
-
 /**
  * __account_scheduler_latency - record an occurred latency
  * @tsk - the task struct of the task hitting the latency
@@ -191,7 +177,8 @@ void __sched
 	lat.count = 1;
 	lat.time = usecs;
 	lat.max = usecs;
-	store_stacktrace(tsk, &lat);
+
+	stack_trace_save_tsk(tsk, lat.backtrace, LT_BACKTRACEDEPTH, 0);
 
 	raw_spin_lock_irqsave(&latency_lock, flags);
 


