From: Steven Rostedt <srostedt@redhat.com>
Date: Fri, 6 Feb 2009 00:54:51 +0000 (-0500)
Subject: ring-buffer: allow tracing_off to be used in core kernel code
X-Git-Tag: v2.6.30-rc1~2^2~124^2~5
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=d8b891a2db13c8ed296158d6f8c4e335896d0cef;p=~shefty%2Frdma-dev.git

ring-buffer: allow tracing_off to be used in core kernel code

tracing_off() is the fastest way to stop recording to the ring buffers.
This may be used in places like panic and die, just before the
ftrace_dump is called.

This patch adds the appropriate CPP conditionals to make it a stub
function when the ring buffer is not configured it.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---

diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h
index b3b35966008..ac94c066f6e 100644
--- a/include/linux/ring_buffer.h
+++ b/include/linux/ring_buffer.h
@@ -124,9 +124,18 @@ unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu);
 u64 ring_buffer_time_stamp(int cpu);
 void ring_buffer_normalize_time_stamp(int cpu, u64 *ts);
 
+/*
+ * The below functions are fine to use outside the tracing facility.
+ */
+#ifdef CONFIG_RING_BUFFER
 void tracing_on(void);
 void tracing_off(void);
 void tracing_off_permanent(void);
+#else
+static inline void tracing_on(void) { }
+static inline void tracing_off(void) { }
+static inline void tracing_off_permanent(void) { }
+#endif
 
 void *ring_buffer_alloc_read_page(struct ring_buffer *buffer);
 void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data);