linux-kernel - [PATCH] x86: Provide _sdata in the vmlinux

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Date:	Thu, 07 May 2009 12:06:49 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	x86@...nel.org, linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] x86: Provide _sdata in the vmlinux_*.lds.S files

_sdata is a common symbol defined by many architectures and made
available to the kernel via asm-generic/sections.h. Kmemleak uses this
symbol when scanning the data sections. The _edata symbol in
vmlinux_64.lds.S was also moved further down to include the
.data.read_mostly section.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/vmlinux_32.lds.S |    1 +
 arch/x86/kernel/vmlinux_64.lds.S |    3 ++-
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S
index 62ad500..181bd49 100644
--- a/arch/x86/kernel/vmlinux_32.lds.S
+++ b/arch/x86/kernel/vmlinux_32.lds.S
@@ -64,6 +64,7 @@ SECTIONS
   /* writeable */
   . = ALIGN(PAGE_SIZE);
   .data : AT(ADDR(.data) - LOAD_OFFSET) {	/* Data */
+	_sdata = .;		/* Start of data section */
 	DATA_DATA
 	CONSTRUCTORS
 	} :data
diff --git a/arch/x86/kernel/vmlinux_64.lds.S b/arch/x86/kernel/vmlinux_64.lds.S
index c874250..4398a91 100644
--- a/arch/x86/kernel/vmlinux_64.lds.S
+++ b/arch/x86/kernel/vmlinux_64.lds.S
@@ -59,9 +59,9 @@ SECTIONS
   . = ALIGN(PAGE_SIZE);		/* Align data segment to page size boundary */
 				/* Data */
   .data : AT(ADDR(.data) - LOAD_OFFSET) {
+	_sdata = .;			/* Start of data section */
 	DATA_DATA
 	CONSTRUCTORS
-	_edata = .;			/* End of data section */
 	} :data
 
 
@@ -73,6 +73,7 @@ SECTIONS
   . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
   .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
   	*(.data.read_mostly)
+	_edata = .;			/* End of data section */
   }
 
 #define VSYSCALL_ADDR (-10*1024*1024)

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