linux-kernel - [PATCH v15 01/23] tracing: Update some tracing

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Date:	Fri, 26 Feb 2016 10:01:04 -0600
From:	Tom Zanussi <tom.zanussi@...ux.intel.com>
To:	rostedt@...dmis.org
Cc:	masami.hiramatsu.pt@...achi.com, namhyung@...nel.org,
	josh@...htriplett.org, andi@...stfloor.org,
	mathieu.desnoyers@...icios.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org,
	Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH v15 01/23] 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.

Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
---
 kernel/trace/tracing_map.c | 4 ++--
 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 dd6401d..e0f1729 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 7571825..b575d0b 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);
-- 
1.9.3