linux-kernel - [tip:locking/core] tools/lib/lockdep: Add userspace version of READ

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Message-ID: <tip-9d5a23ac8e0ede14a2b23740d231727ba5be483a@git.kernel.org>
Date:	Mon, 29 Feb 2016 03:22:59 -0800
From:	tip-bot for Alfredo Alvarez Fernandez <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	alfredoalvarezfernandez@...il.com, linux-kernel@...r.kernel.org,
	mingo@...nel.org, tglx@...utronix.de, peterz@...radead.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	hpa@...or.com, paulmck@...ux.vnet.ibm.com, sasha.levin@...cle.com
Subject: [tip:locking/core] tools/lib/lockdep: Add userspace version of
 READ_ONCE()

Commit-ID:  9d5a23ac8e0ede14a2b23740d231727ba5be483a
Gitweb:     http://git.kernel.org/tip/9d5a23ac8e0ede14a2b23740d231727ba5be483a
Author:     Alfredo Alvarez Fernandez <alfredoalvarezfernandez@...il.com>
AuthorDate: Fri, 19 Feb 2016 07:48:51 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 29 Feb 2016 10:29:27 +0100

tools/lib/lockdep: Add userspace version of READ_ONCE()

This was added to the kernel code in <1658d35ead5d> ("list: Use
READ_ONCE() when testing for empty lists").

There's nothing special we need to do about it in userspace.

Signed-off-by: Alfredo Alvarez Fernandez <alfredoalvarezfernandez@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Sasha Levin <sasha.levin@...cle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1455864533-7536-2-git-send-email-alfredoalvarezernandez@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/lib/lockdep/uinclude/linux/compiler.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/lockdep/uinclude/linux/compiler.h b/tools/lib/lockdep/uinclude/linux/compiler.h
index 6386dc3..fd3e56a 100644
--- a/tools/lib/lockdep/uinclude/linux/compiler.h
+++ b/tools/lib/lockdep/uinclude/linux/compiler.h
@@ -3,6 +3,7 @@
 
 #define __used		__attribute__((__unused__))
 #define unlikely
+#define READ_ONCE(x) (x)
 #define WRITE_ONCE(x, val) x=(val)
 #define RCU_INIT_POINTER(p, v) p=(v)