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tracing: Update some tracing_map constants and comments

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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>
This commit is contained in:
Tom Zanussi
2016-03-03 12:54:41 -06:00
committed by Steven Rostedt
parent 8d44f2f34f
commit 3b772b96b8
2 changed files with 5 additions and 4 deletions
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kernel/trace/tracing_map.c
+2 -2
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@@ -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,