[PATCH 1/7] percpu: Add a DEFINE_PER_CPU_2PAGE_ALIGNED

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

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@xxxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 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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