linux-kernel - [PATCH v3 13/21] kexec: allocate vmcoreinfo note buffer on page-size boundary

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Date:	Sat, 16 Mar 2013 13:02:00 +0900
From:	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
To:	vgoyal@...hat.com, ebiederm@...ssion.com, cpw@....com,
	kumagai-atsushi@....nes.nec.co.jp, lisa.mitchell@...com,
	heiko.carstens@...ibm.com, akpm@...ux-foundation.org
Cc:	kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
	zhangyanfei@...fujitsu.com
Subject: [PATCH v3 13/21] kexec: allocate vmcoreinfo note buffer on page-size
 boundary

To satisfy mmap()'s page-size boundary requirement, specify aligned
attribute to vmcoreinfo_note objects to allocate it on page-size
boundary.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
---

 include/linux/kexec.h |    6 ++++--
 kernel/kexec.c        |    2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index d2e6927..5113570 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -185,8 +185,10 @@ extern struct kimage *kexec_crash_image;
 #define VMCOREINFO_BYTES           (4096)
 #define VMCOREINFO_NOTE_NAME       "VMCOREINFO"
 #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4)
-#define VMCOREINFO_NOTE_SIZE       (KEXEC_NOTE_HEAD_BYTES*2 + VMCOREINFO_BYTES \
-				    + VMCOREINFO_NOTE_NAME_BYTES)
+#define VMCOREINFO_NOTE_SIZE       ALIGN(KEXEC_NOTE_HEAD_BYTES*2	\
+					 +VMCOREINFO_BYTES		\
+					 +VMCOREINFO_NOTE_NAME_BYTES,	\
+					 PAGE_SIZE)
 
 /* Location of a reserved region to hold the crash kernel.
  */
diff --git a/kernel/kexec.c b/kernel/kexec.c
index d1f365e..195de6d 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -43,7 +43,7 @@ note_buf_t __percpu *crash_notes;
 
 /* vmcoreinfo stuff */
 static unsigned char vmcoreinfo_data[VMCOREINFO_BYTES];
-u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4];
+u32 vmcoreinfo_note[VMCOREINFO_NOTE_SIZE/4] __aligned(PAGE_SIZE);
 size_t vmcoreinfo_size;
 size_t vmcoreinfo_max_size = sizeof(vmcoreinfo_data);
 

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