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

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
View File

@ -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;
}

8
kernel/trace/trace.c
View File

@ -904,8 +904,7 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
return;
pc = preempt_count();
resched = need_resched();
preempt_disable_notrace();
resched = ftrace_preempt_disable();
local_save_flags(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
@ -915,10 +914,7 @@ function_trace_call(unsigned long ip, unsigned long parent_ip)
trace_function(tr, data, ip, parent_ip, flags, pc);
atomic_dec(&data->disabled);
if (resched)
preempt_enable_no_resched_notrace();
else
preempt_enable_notrace();
ftrace_preempt_enable(resched);
}
static struct ftrace_ops trace_ops __read_mostly =

13
kernel/trace/trace_sched_wakeup.c
View File

@ -50,8 +50,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
return;
pc = preempt_count();
resched = need_resched();
preempt_disable_notrace();
resched = ftrace_preempt_disable();
cpu = raw_smp_processor_id();
data = tr->data[cpu];
@ -81,15 +80,7 @@ wakeup_tracer_call(unsigned long ip, unsigned long parent_ip)
out:
atomic_dec(&data->disabled);
/*
* To prevent recursion from the scheduler, if the
* resched flag was set before we entered, then
* don't reschedule.
*/
if (resched)
preempt_enable_no_resched_notrace();
else
preempt_enable_notrace();
ftrace_preempt_enable(resched);
}
static struct ftrace_ops trace_ops __read_mostly =

8
kernel/trace/trace_stack.c
View File

@ -107,8 +107,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
if (unlikely(!ftrace_enabled || stack_trace_disabled))
return;
resched = need_resched();
preempt_disable_notrace();
resched = ftrace_preempt_disable();
cpu = raw_smp_processor_id();
/* no atomic needed, we only modify this variable by this cpu */
@ -120,10 +119,7 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip)
out:
per_cpu(trace_active, cpu)--;
/* prevent recursion in schedule */
if (resched)
preempt_enable_no_resched_notrace();
else
preempt_enable_notrace();
ftrace_preempt_enable(resched);
}
static struct ftrace_ops trace_ops __read_mostly =