[tip:locking/core] locking/Documentation: Use `warning` RST directive

[tip-bot for SeongJae Park]

Commit-ID:  173af2613efdc29547718848a0a2928a26b1398f
Gitweb:     https://git.kernel.org/tip/173af2613efdc29547718848a0a2928a26b1398f
Author:     SeongJae Park <sj38.park@xxxxxxxxx>
AuthorDate: Mon, 14 May 2018 15:55:33 -0700
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 15 May 2018 08:11:15 +0200

locking/Documentation: Use `warning` RST directive

Use the proper RST directive, pointed out by a build warning.

Signed-off-by: SeongJae Park <sj38.park@xxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: akiyks@xxxxxxxxx
Cc: boqun.feng@xxxxxxxxx
Cc: dhowells@xxxxxxxxxx
Cc: j.alglave@xxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: luc.maranget@xxxxxxxx
Cc: npiggin@xxxxxxxxx
Cc: parri.andrea@xxxxxxxxx
Cc: stern@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1526338533-6044-8-git-send-email-paulmck@xxxxxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 Documentation/core-api/atomic_ops.rst | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/core-api/atomic_ops.rst b/Documentation/core-api/atomic_ops.rst
index 4ea4af71e68a..2e7165f86f55 100644
--- a/Documentation/core-api/atomic_ops.rst
+++ b/Documentation/core-api/atomic_ops.rst
@@ -466,10 +466,12 @@ Like the above, except that these routines return a boolean which
 indicates whether the changed bit was set _BEFORE_ the atomic bit
 operation.
 
-WARNING! It is incredibly important that the value be a boolean,
-ie. "0" or "1".  Do not try to be fancy and save a few instructions by
-declaring the above to return "long" and just returning something like
-"old_val & mask" because that will not work.
+
+.. warning::
+        It is incredibly important that the value be a boolean, ie. "0" or "1".
+        Do not try to be fancy and save a few instructions by declaring the
+        above to return "long" and just returning something like "old_val &
+        mask" because that will not work.
 
 For one thing, this return value gets truncated to int in many code
 paths using these interfaces, so on 64-bit if the bit is set in the