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From 69e2c2ae6af68ab499cad3330b6b10c2da1c0949 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 17 Sep 2009 17:31:09 +0200
Subject: [PATCH] latencytop: Convert latency_lock to raw_spinlock
commit 0dfea57f1f486188303e598f96f0f92995bf9276 in tip.
latency_lock is taken in the guts of the scheduler code and needs to
be a real spinlock on RT. convert it to raw_spinlock.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
kernel/latencytop.c | 14 +++++++-------
1 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/kernel/latencytop.c b/kernel/latencytop.c
index 877fb30..3f89349 100644
--- a/kernel/latencytop.c
+++ b/kernel/latencytop.c
@@ -58,7 +58,7 @@
#include <linux/list.h>
#include <linux/stacktrace.h>
-static DEFINE_SPINLOCK(latency_lock);
+static DEFINE_RAW_SPINLOCK(latency_lock);
#define MAXLR 128
static struct latency_record latency_record[MAXLR];
@@ -72,19 +72,19 @@ void clear_all_latency_tracing(struct task_struct *p)
if (!latencytop_enabled)
return;
- spin_lock_irqsave(&latency_lock, flags);
+ raw_spin_lock_irqsave(&latency_lock, flags);
memset(&p->latency_record, 0, sizeof(p->latency_record));
p->latency_record_count = 0;
- spin_unlock_irqrestore(&latency_lock, flags);
+ raw_spin_unlock_irqrestore(&latency_lock, flags);
}
static void clear_global_latency_tracing(void)
{
unsigned long flags;
- spin_lock_irqsave(&latency_lock, flags);
+ raw_spin_lock_irqsave(&latency_lock, flags);
memset(&latency_record, 0, sizeof(latency_record));
- spin_unlock_irqrestore(&latency_lock, flags);
+ raw_spin_unlock_irqrestore(&latency_lock, flags);
}
static void __sched
@@ -190,7 +190,7 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
lat.max = usecs;
store_stacktrace(tsk, &lat);
- spin_lock_irqsave(&latency_lock, flags);
+ raw_spin_lock_irqsave(&latency_lock, flags);
account_global_scheduler_latency(tsk, &lat);
@@ -232,7 +232,7 @@ __account_scheduler_latency(struct task_struct *tsk, int usecs, int inter)
memcpy(&tsk->latency_record[i], &lat, sizeof(struct latency_record));
out_unlock:
- spin_unlock_irqrestore(&latency_lock, flags);
+ raw_spin_unlock_irqrestore(&latency_lock, flags);
}
static int lstats_show(struct seq_file *m, void *v)
--
1.7.0.4
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