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authorLai Jiangshan <laijs@cn.fujitsu.com>2009-03-06 19:21:48 +0300
committerIngo Molnar <mingo@elte.hu>2009-03-06 19:59:11 +0300
commit1ba28e02a18cbdbea123836f6c98efb09cbf59ec (patch)
tree41df06a06c702152902ffd7250f284a6efe9b0da /include/linux/ftrace.h
parent1427cdf0592368bdec57276edaf714040ee8744f (diff)
downloadlinux-1ba28e02a18cbdbea123836f6c98efb09cbf59ec.tar.xz
tracing: add trace_bprintk()
Impact: add a generic printk() for tracing, like trace_printk() trace_bprintk() uses the infrastructure to record events on ring_buffer. [ fweisbec@gmail.com: ported to latest -tip, made it work if !CONFIG_MODULES, never free the format strings from modules because we can't keep track of them and conditionnaly create the ftrace format strings section (reported by Steven Rostedt) ] Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1236356510-8381-4-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 1c9cdca02580..1cc8ca453a9b 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -225,6 +225,27 @@ extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr);
#ifdef CONFIG_TRACE_BPRINTK
extern int trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
+extern int __trace_bprintk(unsigned long ip, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+
+static inline void ____trace_bprintk_check_format(const char *fmt, ...)
+ __attribute__ ((format (printf, 1, 2)));
+static inline void ____trace_bprintk_check_format(const char *fmt, ...) {}
+#define __trace_bprintk_check_format(fmt, args...) \
+do { \
+ if (0) \
+ ____trace_bprintk_check_format(fmt, ##args); \
+} while (0)
+
+#define trace_bprintk(fmt, args...) \
+do { \
+ static char *__attribute__((section("__trace_bprintk_fmt"))) \
+ trace_bprintk_fmt = fmt; \
+ __trace_bprintk_check_format(fmt, ##args); \
+ __trace_bprintk(_THIS_IP_, trace_bprintk_fmt, ##args); \
+} while (0)
+#else
+#define trace_bprintk trace_printk
#endif
/* May be defined in arch */