linux-kernel - [PATCH 1/7] percpu: Add a DEFINE_PER_CPU_2PAGE

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Message-Id: <1398723161-21968-2-git-send-email-andi@firstfloor.org>
Date:	Mon, 28 Apr 2014 15:12:35 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	tj@...nel.org
Subject: [PATCH 1/7] percpu: Add a DEFINE_PER_CPU_2PAGE_ALIGNED

From: Andi Kleen <ak@...ux.intel.com>

Needed in a followon patch which needs to naturally align a 8K stack.
I just put it into the page aligned section. This may cause an extra
4K hole if we're unlucky.

Cc: tj@...nel.org
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 include/linux/percpu-defs.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index a5fc7d0..5b2f5b0 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -142,6 +142,10 @@
 	DEFINE_PER_CPU_SECTION(type, name, "..page_aligned")		\
 	__aligned(PAGE_SIZE)
 
+#define DEFINE_PER_CPU_2PAGE_ALIGNED(type, name)			\
+	DEFINE_PER_CPU_SECTION(type, name, "..page_aligned")		\
+	__aligned(2*PAGE_SIZE)
+
 /*
  * Declaration/definition used for per-CPU variables that must be read mostly.
  */
-- 
1.9.0

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