[tip:perf/core] percpu: Add {get,put}_cpu_ptr

[tip-bot for Peter Zijlstra <a.p.zijlstra@chello.nl>]

Commit-ID:  8b8e2ec1eeca7f6941bc81cefc9663018d6ceb57
Gitweb:     http://git.kernel.org/tip/8b8e2ec1eeca7f6941bc81cefc9663018d6ceb57
Author:     Peter Zijlstra <a.p.zijlstra@chello.nl>
AuthorDate: Thu, 16 Sep 2010 19:21:28 +0200
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Tue, 21 Sep 2010 13:55:43 +0200

percpu: Add {get,put}_cpu_ptr

These are similar to {get,put}_cpu_var() except for dynamically
allocated per-cpu memory.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Tejun Heo <tj@kernel.org>
LKML-Reference: <20100917093009.252867712@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 include/linux/percpu.h |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 49466b1..0eb5083 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -39,6 +39,15 @@
 	preempt_enable();				\
 } while (0)
 
+#define get_cpu_ptr(var) ({				\
+	preempt_disable();				\
+	this_cpu_ptr(var); })
+
+#define put_cpu_ptr(var) do {				\
+	(void)(var);					\
+	preempt_enable();				\
+} while (0)
+
 #ifdef CONFIG_SMP
 
 /* minimum unit size, also is the maximum supported allocation size */