seqlock: add missing parameter documentation for raw_seqcount_try_begin()

Add missing documentation for raw_seqcount_try_begin() start parameter.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: dba4761 ("seqlock: add raw_seqcount_try_begin")
Reported-by: Stephen Rothwell <[email protected]>
Closes: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Suren Baghdasaryan <[email protected]>
Acked-by: Waiman Long <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Liam Howlett <[email protected]>
Cc: Peter Zijlstra (Intel) <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: surenbaghdasaryan

include/linux/seqlock.h

@@ -322,6 +322,7 @@ SEQCOUNT_LOCKNAME(mutex,        struct mutex,    true,     mutex)
  * raw_seqcount_try_begin() - begin a seqcount_t read critical section
  *                            w/o lockdep and w/o counter stabilization
  * @s: Pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants
+ * @start: count to be passed to read_seqcount_retry()
  *
  * Similar to raw_seqcount_begin(), except it enables eliding the critical
  * section entirely if odd, instead of doing the speculation knowing it will