Commit 2030eae5 authored by Vivek Goyal's avatar Vivek Goyal Committed by Linus Torvalds
Browse files

[PATCH] Retrieve elfcorehdr address from command line 



This patch adds support for retrieving the address of elf core header if one
is passed in command line.

Signed-off-by: default avatarVivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 60e64d46

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -451,6 +451,10 @@ running once the system is up. 
			Format: {"as"|"cfq"|"deadline"|"noop"}

			See Documentation/block/as-iosched.txt

			and Documentation/block/deadline-iosched.txt for details.

	elfcorehdr=	[IA-32]

			Specifies physical address of start of kernel core image

			elf header.

			See Documentation/kdump.txt for details.



	enforcing	[SELINUX] Set initial enforcing status.

			Format: {"0" | "1"}

arch/i386/kernel/setup.c

+8 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ 
#include <linux/edd.h>

#include <linux/nodemask.h>

#include <linux/kexec.h>

#include <linux/crash_dump.h>



#include <video/edid.h>
@@ -881,6 +882,13 @@ static void __init parse_cmdline_early (char ** cmdline_p) 
			}

		}

#endif

#ifdef CONFIG_CRASH_DUMP

		/* elfcorehdr= specifies the location of elf core header

		 * stored by the crashed kernel.

		 */

		else if (!memcmp(from, "elfcorehdr=", 11))

			elfcorehdr_addr = memparse(from+11, &from);

#endif



		/*

		 * highmem=size forces highmem to be exactly 'size' bytes.

include/linux/crash_dump.h

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
#include <linux/device.h>

#include <linux/proc_fs.h>



extern unsigned long long elfcorehdr_addr;

extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,

						unsigned long, int);

#endif /* CONFIG_CRASH_DUMP */

kernel/crash_dump.c

+3 −0
Original line number Diff line number Diff line
@@ -15,6 +15,9 @@ 
#include <asm/io.h>

#include <asm/uaccess.h>



/* Stores the physical address of elf header of crash image. */

unsigned long long elfcorehdr_addr;



/*

 * Copy a page from "oldmem". For this page, there is no pte mapped

 * in the current kernel. We stitch up a pte, similar to kmap_atomic.