From aac04b32f3e4c63f461459d0e1d6aa01caac6e66 Mon Sep 17 00:00:00 2001
From: Vivek Goyal <vgoyal@in.ibm.com>
Date: Mon, 9 Jan 2006 20:51:47 -0800
Subject: [PATCH] [PATCH] kdump: x86_64: add elfcorehdr command line option
- elfcorehdr= specifies the location of elf core header stored by the
crashed kernel. This command line option will be passed by the kexec-tools
to capture kernel.
Changes in this version :
- Added more comments in kernel-parameters.txt and in code.
Signed-off-by: Murali M Chakravarthy <muralim@in.ibm.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
Documentation/kernel-parameters.txt | 7 ++++---
arch/i386/kernel/setup.c | 2 +-
arch/x86_64/kernel/setup.c | 9 +++++++++
3 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 12b7d938a897f..dd0bfc291a682 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -475,10 +475,11 @@ running once the system is up.
See Documentation/block/as-iosched.txt and
Documentation/block/deadline-iosched.txt for details.
- elfcorehdr= [IA-32]
+ elfcorehdr= [IA-32, X86_64]
Specifies physical address of start of kernel core
- image elf header.
- See Documentation/kdump.txt for details.
+ image elf header. Generally kexec loader will
+ pass this option to capture kernel.
+ See Documentation/kdump/kdump.txt for details.
enforcing [SELINUX] Set initial enforcing status.
Format: {"0" | "1"}
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 27c956db04615..f685637a100d7 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -898,7 +898,7 @@ static void __init parse_cmdline_early (char ** cmdline_p)
}
}
#endif
-#ifdef CONFIG_CRASH_DUMP
+#ifdef CONFIG_PROC_VMCORE
/* elfcorehdr= specifies the location of elf core header
* stored by the crashed kernel.
*/
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c
index ff9620b800c07..a0e0c9ca8f10c 100644
--- a/arch/x86_64/kernel/setup.c
+++ b/arch/x86_64/kernel/setup.c
@@ -35,6 +35,7 @@
#include <asm/processor.h>
#include <linux/console.h>
#include <linux/seq_file.h>
+#include <linux/crash_dump.h>
#include <linux/root_dev.h>
#include <linux/pci.h>
#include <linux/acpi.h>
@@ -418,6 +419,14 @@ static __init void parse_cmdline_early (char ** cmdline_p)
}
#endif
+#ifdef CONFIG_PROC_VMCORE
+ /* elfcorehdr= specifies the location of elf core header
+ * stored by the crashed kernel. This option will be passed
+ * by kexec loader to the capture kernel.
+ */
+ else if(!memcmp(from, "elfcorehdr=", 11))
+ elfcorehdr_addr = memparse(from+11, &from);
+#endif
next_char:
c = *(from++);
if (!c)
--
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