Commit-ID: fc7bdc90249b216051d06496577c306327f2e3f5 Gitweb: https://git.kernel.org/tip/fc7bdc90249b216051d06496577c306327f2e3f5 Author: SeongJae Park <sj38.park@xxxxxxxxx> AuthorDate: Mon, 14 May 2018 15:55:32 -0700 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Tue, 15 May 2018 08:11:14 +0200 locking/Documentation: Fix incorrect example code - Remove a stale line of code - Fix the condition of the READ_ONCE() example Signed-off-by: SeongJae Park <sj38.park@xxxxxxxxx> Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> 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 Link: http://lkml.kernel.org/r/1526338533-6044-7-git-send-email-paulmck@xxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- Documentation/core-api/atomic_ops.rst | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/Documentation/core-api/atomic_ops.rst b/Documentation/core-api/atomic_ops.rst index fce929144ccd..4ea4af71e68a 100644 --- a/Documentation/core-api/atomic_ops.rst +++ b/Documentation/core-api/atomic_ops.rst @@ -111,7 +111,6 @@ If the compiler can prove that do_something() does not store to the variable a, then the compiler is within its rights transforming this to the following:: - tmp = a; if (a > 0) for (;;) do_something(); @@ -119,7 +118,7 @@ the following:: If you don't want the compiler to do this (and you probably don't), then you should use something like the following:: - while (READ_ONCE(a) < 0) + while (READ_ONCE(a) > 0) do_something(); Alternatively, you could place a barrier() call in the loop. -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|