linux-kernel - [GIT PULL] percpu changes for v3.12-rc1

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Date:	Tue, 3 Sep 2013 10:29:30 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: [GIT PULL] percpu changes for v3.12-rc1

Hello, Linus.

Just a single patch to update type verification macro for percpu
accessors.  Christoph is trying to replace __get_cpu_var() with
this_cpu accessors which needs this update.  There are still some
issues to be resolved but eventually the conversion patches are likely
to be routed through different trees, so I think it'd be convenient to
merge this commit early.

Thanks.

The following changes since commit a4244454df1296e90cc961c1b636b1176ef0d9a0:

  percpu-refcount: use RCU-sched insted of normal RCU (2013-06-16 16:12:26 -0700)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-3.12

for you to fetch changes up to abec1a806e0c3cf168999667d5fb6218398ef12a:

  percpu: Make __verify_pcu_ptr handle per cpu pointers to arrays (2013-08-23 16:08:27 -0400)

----------------------------------------------------------------
Christoph Lameter (1):
      percpu: Make __verify_pcu_ptr handle per cpu pointers to arrays

 include/linux/percpu-defs.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 27ef6b1..57e890a 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -22,9 +22,12 @@
  * Macro which verifies @ptr is a percpu pointer without evaluating
  * @ptr.  This is to be used in percpu accessors to verify that the
  * input parameter is a percpu pointer.
+ *
+ * + 0 is required in order to convert the pointer type from a
+ * potential array type to a pointer to a single item of the array.
  */
 #define __verify_pcpu_ptr(ptr)	do {					\
-	const void __percpu *__vpp_verify = (typeof(ptr))NULL;		\
+	const void __percpu *__vpp_verify = (typeof((ptr) + 0))NULL;	\
 	(void)__vpp_verify;						\
 } while (0)
 
--
tejun
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