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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-11-12 10:29:54 -0500
committerSteven Rostedt <rostedt@goodmis.org>2014-11-19 15:25:39 -0500
commit19a7fe206232cc875a3083211e0a21c08edd756e (patch)
tree948aba93b9f2f6681eb7cc3209b0ec87e19470d1 /kernel/trace/trace_output.h
parente400a40cffa77e45c60c5431ec8757579247cae2 (diff)
downloadlinux-19a7fe206232cc875a3083211e0a21c08edd756e.tar.bz2
tracing: Add trace_seq_has_overflowed() and trace_handle_return()
Adding a trace_seq_has_overflowed() which returns true if the trace_seq had too much written into it allows us to simplify the code. Instead of checking the return value of every call to trace_seq_printf() and friends, they can all be called normally, and at the end we can return !trace_seq_has_overflowed() instead. Several functions also return TRACE_TYPE_PARTIAL_LINE when the trace_seq overflowed and TRACE_TYPE_HANDLED otherwise. Another helper function was created called trace_handle_return() which takes a trace_seq and returns these enums. Using this helper function also simplifies the code. This change also makes it possible to remove the return values of trace_seq_printf() and friends. They should instead just be void functions. Link: http://lkml.kernel.org/r/20141114011410.365183157@goodmis.org Reviewed-by: Petr Mladek <pmladek@suse.cz> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_output.h')
-rw-r--r--kernel/trace/trace_output.h16
1 files changed, 5 insertions, 11 deletions
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
index 80b25b585a70..8ef2c40efb3c 100644
--- a/kernel/trace/trace_output.h
+++ b/kernel/trace/trace_output.h
@@ -35,17 +35,11 @@ trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry);
extern int __unregister_ftrace_event(struct trace_event *event);
extern struct rw_semaphore trace_event_sem;
-#define SEQ_PUT_FIELD_RET(s, x) \
-do { \
- if (!trace_seq_putmem(s, &(x), sizeof(x))) \
- return TRACE_TYPE_PARTIAL_LINE; \
-} while (0)
-
-#define SEQ_PUT_HEX_FIELD_RET(s, x) \
-do { \
- if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
- return TRACE_TYPE_PARTIAL_LINE; \
-} while (0)
+#define SEQ_PUT_FIELD(s, x) \
+ trace_seq_putmem(s, &(x), sizeof(x))
+
+#define SEQ_PUT_HEX_FIELD(s, x) \
+ trace_seq_putmem_hex(s, &(x), sizeof(x))
#endif