linux-kernel - [tip:x86/asm] x86/i386: Put aligned stack-canary in percpu shared

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Date:	Fri, 4 Sep 2009 07:58:05 GMT
From:	tip-bot for Jeremy Fitzhardinge <jeremy@...p.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	eric.dumazet@...il.com, jeremy.fitzhardinge@...rix.com,
	jeremy@...p.org, tj@...nel.org, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:x86/asm] x86/i386: Put aligned stack-canary in percpu shared_aligned section

Commit-ID:  53f824520b6d84ca5b4a8fd71addc91dbf64357e
Gitweb:     http://git.kernel.org/tip/53f824520b6d84ca5b4a8fd71addc91dbf64357e
Author:     Jeremy Fitzhardinge <jeremy@...p.org>
AuthorDate: Thu, 3 Sep 2009 14:31:44 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 4 Sep 2009 07:10:31 +0200

x86/i386: Put aligned stack-canary in percpu shared_aligned section

Pack aligned things together into a special section to minimize
padding holes.

Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Cc: Tejun Heo <tj@...nel.org>
LKML-Reference: <4AA035C0.9070202@...p.org>
[ queued up in tip:x86/asm because it depends on this commit:
  x86/i386: Make sure stack-protector segment base is cache aligned ]
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/include/asm/processor.h |    2 +-
 arch/x86/kernel/cpu/common.c     |    2 +-
 include/asm-generic/percpu.h     |    3 +++
 include/linux/percpu-defs.h      |    8 ++++++++
 4 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index e597ecc..ac7e796 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -413,7 +413,7 @@ struct stack_canary {
 	char __pad[20];		/* canary at %gs:20 */
 	unsigned long canary;
 };
-DECLARE_PER_CPU(struct stack_canary, stack_canary) ____cacheline_aligned;
+DECLARE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
 #endif
 #endif	/* X86_64 */
 
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 7d84bc4..f23e236 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1043,7 +1043,7 @@ DEFINE_PER_CPU(struct orig_ist, orig_ist);
 #else	/* CONFIG_X86_64 */
 
 #ifdef CONFIG_CC_STACKPROTECTOR
-DEFINE_PER_CPU(struct stack_canary, stack_canary) ____cacheline_aligned;
+DEFINE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
 #endif
 
 /* Make sure %fs and %gs are initialized properly in idle threads */
diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h
index aa00800..90079c3 100644
--- a/include/asm-generic/percpu.h
+++ b/include/asm-generic/percpu.h
@@ -81,14 +81,17 @@ extern void setup_per_cpu_areas(void);
 
 #ifdef MODULE
 #define PER_CPU_SHARED_ALIGNED_SECTION ""
+#define PER_CPU_ALIGNED_SECTION ""
 #else
 #define PER_CPU_SHARED_ALIGNED_SECTION ".shared_aligned"
+#define PER_CPU_ALIGNED_SECTION ".shared_aligned"
 #endif
 #define PER_CPU_FIRST_SECTION ".first"
 
 #else
 
 #define PER_CPU_SHARED_ALIGNED_SECTION ""
+#define PER_CPU_ALIGNED_SECTION ".shared_aligned"
 #define PER_CPU_FIRST_SECTION ""
 
 #endif
diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h
index 68438e1..3058cf9 100644
--- a/include/linux/percpu-defs.h
+++ b/include/linux/percpu-defs.h
@@ -66,6 +66,14 @@
 	DEFINE_PER_CPU_SECTION(type, name, PER_CPU_SHARED_ALIGNED_SECTION) \
 	____cacheline_aligned_in_smp
 
+#define DECLARE_PER_CPU_ALIGNED(type, name)				\
+	DECLARE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION)	\
+	____cacheline_aligned
+
+#define DEFINE_PER_CPU_ALIGNED(type, name)				\
+	DEFINE_PER_CPU_SECTION(type, name, PER_CPU_ALIGNED_SECTION)	\
+	____cacheline_aligned
+
 /*
  * Declaration/definition used for per-CPU variables that must be page aligned.
  */
--
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