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tracing: add trace_bprintk()

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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>
This commit is contained in:
Lai Jiangshan
2009-03-06 17:21:48 +01:00
committed by Ingo Molnar
parent 1427cdf059
commit 1ba28e02a1
6 changed files with 133 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
include/linux/ftrace.h
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@@ -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 */