diff options
author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-06-26 17:42:41 +0400 |
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committer | Steven Rostedt <rostedt@goodmis.org> | 2014-07-01 15:13:39 +0400 |
commit | 7b039cb4c5a90d8ea576b17e096f7334457aeb57 (patch) | |
tree | f901548a3740e26a36f142e049e28918199ca67f /include/linux/trace_seq.h | |
parent | 3f4d8f78a07dba1cb333ce749bd6a15c1ada362d (diff) | |
download | linux-7b039cb4c5a90d8ea576b17e096f7334457aeb57.tar.xz |
tracing: Add trace_seq_buffer_ptr() helper function
There's several locations in the kernel that open code the calculation
of the next location in the trace_seq buffer. This is usually done with
p->buffer + p->len
Instead of having this open coded, supply a helper function in the
header to do it for them. This function is called trace_seq_buffer_ptr().
Link: http://lkml.kernel.org/p/20140626220129.452783019@goodmis.org
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_seq.h')
-rw-r--r-- | include/linux/trace_seq.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/trace_seq.h b/include/linux/trace_seq.h index dd85753e1bb0..ea6c9dea79e3 100644 --- a/include/linux/trace_seq.h +++ b/include/linux/trace_seq.h @@ -25,6 +25,21 @@ trace_seq_init(struct trace_seq *s) s->full = 0; } +/** + * trace_seq_buffer_ptr - return pointer to next location in buffer + * @s: trace sequence descriptor + * + * Returns the pointer to the buffer where the next write to + * the buffer will happen. This is useful to save the location + * that is about to be written to and then return the result + * of that write. + */ +static inline unsigned char * +trace_seq_buffer_ptr(struct trace_seq *s) +{ + return s->buffer + s->len; +} + /* * Currently only defined when tracing is enabled. */ |