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| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2016-03-03 12:54:41 -0600 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-04-19 12:16:06 -0400 |
| commit | 3b772b96b8338bca2532839b2cd7802800e66037 (patch) | |
| tree | 901bba2854a738269cd8d727b01ddaf37b5e0245 /kernel | |
| parent | 8d44f2f34fb50f40185ef6404b0047223a27ba82 (diff) | |
| download | linux-3b772b96b8338bca2532839b2cd7802800e66037.tar.gz linux-3b772b96b8338bca2532839b2cd7802800e66037.tar.bz2 linux-3b772b96b8338bca2532839b2cd7802800e66037.zip | |
tracing: Update some tracing_map constants and comments
Make it clear exactly how many keys and values are supported through
better defines, and add 1 to the vals count, since normally clients
want support for at least a hitcount and two other values.
Also, note the error return value for tracing_map_add_key/val_field()
in the comments.
Link: http://lkml.kernel.org/r/6696fa02ebc716aa344c27a571a2afaa25e5b4d4.1457029949.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/tracing_map.c | 4 | ||||
| -rw-r--r-- | kernel/trace/tracing_map.h | 5 |
2 files changed, 5 insertions, 4 deletions
diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c index dd6401dd145e..e0f172932eca 100644 --- a/kernel/trace/tracing_map.c +++ b/kernel/trace/tracing_map.c @@ -163,7 +163,7 @@ static int tracing_map_add_field(struct tracing_map *map, * tracing_map_update_sum() or reading it via tracing_map_read_sum(). * * Return: The index identifying the field in the map and associated - * tracing_map_elts. + * tracing_map_elts, or -EINVAL on error. */ int tracing_map_add_sum_field(struct tracing_map *map) { @@ -184,7 +184,7 @@ int tracing_map_add_sum_field(struct tracing_map *map) * the key referenced by this key field resides. * * Return: The index identifying the field in the map and associated - * tracing_map_elts. + * tracing_map_elts, or -EINVAL on error. */ int tracing_map_add_key_field(struct tracing_map *map, unsigned int offset, diff --git a/kernel/trace/tracing_map.h b/kernel/trace/tracing_map.h index 1f7eda548787..618838f5f30a 100644 --- a/kernel/trace/tracing_map.h +++ b/kernel/trace/tracing_map.h @@ -5,9 +5,10 @@ #define TRACING_MAP_BITS_MAX 17 #define TRACING_MAP_BITS_MIN 7 -#define TRACING_MAP_FIELDS_MAX 4 #define TRACING_MAP_KEYS_MAX 2 - +#define TRACING_MAP_VALS_MAX 3 +#define TRACING_MAP_FIELDS_MAX (TRACING_MAP_KEYS_MAX + \ + TRACING_MAP_VALS_MAX) #define TRACING_MAP_SORT_KEYS_MAX 2 typedef int (*tracing_map_cmp_fn_t) (void *val_a, void *val_b); |