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ftrace: insert in the ftrace_preempt_disable()/enable() functions

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Impact: use new, consolidated APIs in ftrace plugins

This patch replaces the schedule safe preempt disable code with the
ftrace_preempt_disable() and ftrace_preempt_enable() safe functions.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt
2008-11-03 23:15:56 -05:00
committed by Ingo Molnar
parent 8f0a056fcb
commit 182e9f5f70
4 changed files with 15 additions and 41 deletions
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27
kernel/trace/ring_buffer.c
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@@ -16,6 +16,8 @@
#include <linux/list.h>
#include <linux/fs.h>
#include "trace.h"
/* Up this if you want to test the TIME_EXTENTS and normalization */
#define DEBUG_SHIFT 0
@@ -1122,8 +1124,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
return NULL;
/* If we are tracing schedule, we don't want to recurse */
resched = need_resched();
preempt_disable_notrace();
resched = ftrace_preempt_disable();
cpu = raw_smp_processor_id();
@@ -1154,10 +1155,7 @@ ring_buffer_lock_reserve(struct ring_buffer *buffer,
return event;
out:
if (resched)
preempt_enable_notrace();
else
preempt_enable_notrace();
ftrace_preempt_enable(resched);
return NULL;
}
@@ -1199,12 +1197,9 @@ int ring_buffer_unlock_commit(struct ring_buffer *buffer,
/*
* Only the last preempt count needs to restore preemption.
*/
if (preempt_count() == 1) {
if (per_cpu(rb_need_resched, cpu))
preempt_enable_no_resched_notrace();
else
preempt_enable_notrace();
} else
if (preempt_count() == 1)
ftrace_preempt_enable(per_cpu(rb_need_resched, cpu));
else
preempt_enable_no_resched_notrace();
return 0;
@@ -1237,8 +1232,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
if (atomic_read(&buffer->record_disabled))
return -EBUSY;
resched = need_resched();
preempt_disable_notrace();
resched = ftrace_preempt_disable();
cpu = raw_smp_processor_id();
@@ -1264,10 +1258,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
ret = 0;
out:
if (resched)
preempt_enable_no_resched_notrace();
else
preempt_enable_notrace();
ftrace_preempt_enable(resched);
return ret;
}