this_cpu: Use this_cpu_xx for ftrace

this_cpu_xx can reduce the instruction count here and also
avoid address arithmetic.

Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4506826..8439cdc 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -86,17 +86,17 @@ static int dummy_set_flag(u32 old_flags, u32 bit, int set)
  */
 static int tracing_disabled = 1;
 
-DEFINE_PER_CPU(local_t, ftrace_cpu_disabled);
+DEFINE_PER_CPU(int, ftrace_cpu_disabled);
 
 static inline void ftrace_disable_cpu(void)
 {
        preempt_disable();
-       local_inc(&__get_cpu_var(ftrace_cpu_disabled));
+       __this_cpu_inc(per_cpu_var(ftrace_cpu_disabled));
 }
 
 static inline void ftrace_enable_cpu(void)
 {
-       local_dec(&__get_cpu_var(ftrace_cpu_disabled));
+       __this_cpu_dec(per_cpu_var(ftrace_cpu_disabled));
        preempt_enable();
 }
 
@@ -1085,7 +1085,7 @@ trace_function(struct trace_array *tr,
        struct ftrace_entry *entry;
 
        /* If we are reading the ring buffer, don't trace */
-       if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled))))
+       if (unlikely(__this_cpu_read(per_cpu_var(ftrace_cpu_disabled))))
                return;
 
        event = trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry),

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 405cb85..542f455 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -413,7 +413,7 @@ extern int DYN_FTRACE_TEST_NAME(void);
 
 extern int ring_buffer_expanded;
 extern bool tracing_selftest_disabled;
-DECLARE_PER_CPU(local_t, ftrace_cpu_disabled);
+DECLARE_PER_CPU(int, ftrace_cpu_disabled);
 
 #ifdef CONFIG_FTRACE_STARTUP_TEST
 extern int trace_selftest_startup_function(struct tracer *trace,