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[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>
This commit is contained in:
Vivek Goyal 2006-01-09 20:51:47 -08:00 committed by Linus Torvalds
parent 69cda7b1f0
commit aac04b32f3
3 changed files with 14 additions and 4 deletions
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7
Documentation/kernel-parameters.txt
View File

@ -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"}

2
arch/i386/kernel/setup.c
View File

@ -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.
*/

9
arch/x86_64/kernel/setup.c
View File

@ -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)