tracing/core: drop the old trace_printk() implementation in favour of trace_bprintk()

Impact: faster and lighter tracing

Now that we have trace_bprintk() which is faster and consume lesser
memory than trace_printk() and has the same purpose, we can now drop
the old implementation in favour of the binary one from trace_bprintk(),
which means we move all the implementation of trace_bprintk() to
trace_printk(), so the Api doesn't change except that we must now use
trace_seq_bprintk() to print the TRACE_PRINT entries.

Some changes result of this:

- Previously, trace_bprintk depended of a single tracer and couldn't
  work without. This tracer has been dropped and the whole implementation
  of trace_printk() (like the module formats management) is now integrated
  in the tracing core (comes with CONFIG_TRACING), though we keep the file
  trace_printk (previously trace_bprintk.c) where we can find the module
  management. Thus we don't overflow trace.c

- changes some parts to use trace_seq_bprintk() to print TRACE_PRINT entries.

- change a bit trace_printk/trace_vprintk macros to support non-builtin formats
  constants, and fix 'const' qualifiers warnings. But this is all transparent for
  developers.

- etc...

V2:

- Rebase against last changes
- Fix mispell on the changelog

V3:

- Rebase against last changes (moving trace_printk() to kernel.h)

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1236356510-8381-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 25 deletions

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 1cc8ca453a9b..e1583f2639b0 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -223,31 +223,6 @@ extern int ftrace_make_nop(struct module *mod,
  */
 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 */
 extern int ftrace_arch_read_dyn_info(char *buf, int size);