blktrace: add blk_fill_rwbs documentation comment
blk_fill_rwbs() is an expoted function, add kernel style documentation
comment.
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
index 11484f1..e17d04a 100644
--- a/include/linux/blktrace_api.h
+++ b/include/linux/blktrace_api.h
@@ -119,7 +119,7 @@ struct compat_blk_user_trace_setup {
#endif
-extern void blk_fill_rwbs(char *rwbs, unsigned int op);
+void blk_fill_rwbs(char *rwbs, unsigned int op);
static inline sector_t blk_rq_trace_sector(struct request *rq)
{
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 8a2591c..d7ebef8 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1867,6 +1867,16 @@ void blk_trace_remove_sysfs(struct device *dev)
#ifdef CONFIG_EVENT_TRACING
+/**
+ * blk_fill_rwbs - Fill the buffer rwbs by mapping op to character string.
+ * @rwbs buffer to be filled
+ * @op: REQ_OP_XXX for the tracepoint
+ *
+ * Description:
+ * Maps the REQ_OP_XXX to character and fills the buffer provided by the
+ * caller with resulting string.
+ *
+ **/
void blk_fill_rwbs(char *rwbs, unsigned int op)
{
int i = 0;