path: root/arch/x86/kernel/machine_kexec_64.c
diff options
authorKen'ichi Ohmichi <>2007-10-16 23:27:27 -0700
committerLinus Torvalds <>2007-10-17 08:42:54 -0700
commitfd59d231f81cb02870b9cf15f456a897f3669b4e (patch)
tree5713c13bd678774f1ba3c42bfff5008c1812deae /arch/x86/kernel/machine_kexec_64.c
parent0e647c04f665e9b3451a1ebe8252b38ffe0207c8 (diff)
Add vmcoreinfo
This patch set frees the restriction that makedumpfile users should install a vmlinux file (including the debugging information) into each system. makedumpfile command is the dump filtering feature for kdump. It creates a small dumpfile by filtering unnecessary pages for the analysis. To distinguish unnecessary pages, it needs a vmlinux file including the debugging information. These days, the debugging package becomes a huge file, and it is hard to install it into each system. To solve the problem, kdump developers discussed it at lkml and kexec-ml. As the result, we reached the conclusion that necessary information for dump filtering (called "vmcoreinfo") should be embedded into the first kernel file and it should be accessed through /proc/vmcore during the second kernel. ( Dan Aloni created the patch set for the above implementation. ( And I updated it for multi architectures and memory models. ( Signed-off-by: Dan Aloni <> Signed-off-by: Ken'ichi Ohmichi <> Signed-off-by: Bernhard Walle <> Signed-off-by: Daisuke Nishimura <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'arch/x86/kernel/machine_kexec_64.c')
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index cd1899a2f0c5..e333ea110a58 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -10,6 +10,7 @@
#include <linux/kexec.h>
#include <linux/string.h>
#include <linux/reboot.h>
+#include <linux/numa.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
@@ -257,3 +258,11 @@ static int __init setup_crashkernel(char *arg)
early_param("crashkernel", setup_crashkernel);
+void arch_crash_save_vmcoreinfo(void)
+ SYMBOL(node_data);
+ LENGTH(node_data, MAX_NUMNODES);