tracing: Use CONFIG_PREEMPTION

CONFIG_PREEMPTION is selected by CONFIG_PREEMPT and by
CONFIG_PREEMPT_RT. Both PREEMPT and PREEMPT_RT require the same
functionality which today depends on CONFIG_PREEMPT.

Switch the conditionals in the tracer over to CONFIG_PREEMPTION.

This is the first step to make the tracer work on RT. The other small
tweaks are submitted separately.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Paul E. McKenney <paulmck@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190726212124.409766323@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index d2c1fe0..6a64d77 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -179,7 +179,7 @@ config TRACE_PREEMPT_TOGGLE
 config PREEMPTIRQ_EVENTS
        bool "Enable trace events for preempt and irq disable/enable"
        select TRACE_IRQFLAGS
-       select TRACE_PREEMPT_TOGGLE if PREEMPT
+       select TRACE_PREEMPT_TOGGLE if PREEMPTION
        select GENERIC_TRACER
        default n
        help
@@ -214,7 +214,7 @@ config PREEMPT_TRACER
        bool "Preemption-off Latency Tracer"
        default n
        depends on !ARCH_USES_GETTIMEOFFSET
-       depends on PREEMPT
+       depends on PREEMPTION
        select GENERIC_TRACER
        select TRACER_MAX_TRACE
        select RING_BUFFER_ALLOW_SWAP

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eca3450..a800e86 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2814,7 +2814,7 @@ int ftrace_shutdown(struct ftrace_ops *ops, int command)
                 * synchornize_rcu_tasks() will wait for those tasks to
                 * execute and either schedule voluntarily or enter user space.
                 */
-               if (IS_ENABLED(CONFIG_PREEMPT))
+               if (IS_ENABLED(CONFIG_PREEMPTION))
                        synchronize_rcu_tasks();
 
  free_ops:

diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c
index 0564f6d..09b0b49 100644 (file)
--- a/kernel/trace/ring_buffer_benchmark.c
+++ b/kernel/trace/ring_buffer_benchmark.c
@@ -267,7 +267,7 @@ static void ring_buffer_producer(void)
                if (consumer && !(cnt % wakeup_interval))
                        wake_up_process(consumer);
 
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
                /*
                 * If we are a non preempt kernel, the 10 second run will
                 * stop everything while it runs. Instead, we will call

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index c7506bc..5a189fb 100644 (file)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -255,12 +255,12 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
        local_save_flags(fbuffer->flags);
        fbuffer->pc = preempt_count();
        /*
-        * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
+        * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables
         * preemption (adding one to the preempt_count). Since we are
         * interested in the preempt_count at the time the tracepoint was
         * hit, we need to subtract one to offset the increment.
         */
-       if (IS_ENABLED(CONFIG_PREEMPT))
+       if (IS_ENABLED(CONFIG_PREEMPTION))
                fbuffer->pc--;
        fbuffer->trace_file = trace_file;