From 19a7fe206232cc875a3083211e0a21c08edd756e Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Wed, 12 Nov 2014 10:29:54 -0500 Subject: 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 Signed-off-by: Steven Rostedt --- include/linux/trace_seq.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'include/linux/trace_seq.h') diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h index ea6c9dea79e3..07eda413dfcf 100644 --- a/include/linux/trace_seq.h +++ b/include/linux/trace_seq.h @@ -40,6 +40,18 @@ trace_seq_buffer_ptr(struct trace_seq *s) return s->buffer + s->len; } +/** + * trace_seq_has_overflowed - return true if the trace_seq took too much + * @s: trace sequence descriptor + * + * Returns true if too much data was added to the trace_seq and it is + * now full and will not take anymore. + */ +static inline bool trace_seq_has_overflowed(struct trace_seq *s) +{ + return s->full || s->len > PAGE_SIZE - 1; +} + /* * Currently only defined when tracing is enabled. */ -- cgit v1.2.3