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locking, tracing: Annotate tracing locks as raw

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The tracing locks can be taken in atomic context and therefore
cannot be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
2009-07-25 17:13:33 +02:00
committed by Ingo Molnar
parent 740969f91e
commit 5389f6fad2
3 changed files with 34 additions and 34 deletions
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10
kernel/trace/trace.c
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@@ -341,7 +341,7 @@ unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
TRACE_ITER_GRAPH_TIME | TRACE_ITER_RECORD_CMD | TRACE_ITER_OVERWRITE;
static int trace_stop_count;
static DEFINE_SPINLOCK(tracing_start_lock);
static DEFINE_RAW_SPINLOCK(tracing_start_lock);
static void wakeup_work_handler(struct work_struct *work)
{
@@ -960,7 +960,7 @@ void tracing_start(void)
if (tracing_disabled)
return;
spin_lock_irqsave(&tracing_start_lock, flags);
raw_spin_lock_irqsave(&tracing_start_lock, flags);
if (--trace_stop_count) {
if (trace_stop_count < 0) {
/* Someone screwed up their debugging */
@@ -985,7 +985,7 @@ void tracing_start(void)
ftrace_start();
out:
spin_unlock_irqrestore(&tracing_start_lock, flags);
raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
}
/**
@@ -1000,7 +1000,7 @@ void tracing_stop(void)
unsigned long flags;
ftrace_stop();
spin_lock_irqsave(&tracing_start_lock, flags);
raw_spin_lock_irqsave(&tracing_start_lock, flags);
if (trace_stop_count++)
goto out;
@@ -1018,7 +1018,7 @@ void tracing_stop(void)
arch_spin_unlock(&ftrace_max_lock);
out:
spin_unlock_irqrestore(&tracing_start_lock, flags);
raw_spin_unlock_irqrestore(&tracing_start_lock, flags);
}
void trace_stop_cmdline_recording(void);