Commit 625f1c82 authored by Vivek Goyal's avatar Vivek Goyal Committed by Linus Torvalds
Browse files

[PATCH] Kdump: Export crash notes section address through sysfs 



o Following patch exports kexec global variable "crash_notes" to user space
  through sysfs as kernel attribute in /sys/kernel.

Signed-off-by: default avatarManeesh Soni <maneesh@in.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent cf13f0ea

arch/i386/kernel/crash.c

+0 −2
Original line number Diff line number Diff line
@@ -26,8 +26,6 @@ 
#include <asm/apic.h>

#include <mach_ipi.h>



#define MAX_NOTE_BYTES 1024

typedef u32 note_buf_t[MAX_NOTE_BYTES/4];



note_buf_t crash_notes[NR_CPUS];

arch/x86_64/kernel/crash.c

+0 −3
Original line number Diff line number Diff line
@@ -20,9 +20,6 @@ 
#include <asm/nmi.h>

#include <asm/hw_irq.h>



#define MAX_NOTE_BYTES 1024

typedef u32 note_buf_t[MAX_NOTE_BYTES/4];



note_buf_t crash_notes[NR_CPUS];



void machine_crash_shutdown(void)

include/asm-i386/kexec.h

+5 −0
Original line number Diff line number Diff line
@@ -25,4 +25,9 @@ 
/* The native architecture */

#define KEXEC_ARCH KEXEC_ARCH_386



#define MAX_NOTE_BYTES 1024

typedef u32 note_buf_t[MAX_NOTE_BYTES/4];



extern note_buf_t crash_notes[];



#endif /* _I386_KEXEC_H */

include/asm-x86_64/kexec.h

+5 −0
Original line number Diff line number Diff line
@@ -25,4 +25,9 @@ 
/* The native architecture */

#define KEXEC_ARCH KEXEC_ARCH_X86_64



#define MAX_NOTE_BYTES 1024

typedef u32 note_buf_t[MAX_NOTE_BYTES/4];



extern note_buf_t crash_notes[];



#endif /* _X86_64_KEXEC_H */

kernel/ksysfs.c

+13 −0
Original line number Diff line number Diff line
@@ -30,12 +30,25 @@ static ssize_t hotplug_seqnum_show(struct subsystem *subsys, char *page) 
KERNEL_ATTR_RO(hotplug_seqnum);

#endif



#ifdef CONFIG_KEXEC

#include <asm/kexec.h>



static ssize_t crash_notes_show(struct subsystem *subsys, char *page)

{

	return sprintf(page, "%p\n", (void *)crash_notes);

}

KERNEL_ATTR_RO(crash_notes);

#endif



decl_subsys(kernel, NULL, NULL);

EXPORT_SYMBOL_GPL(kernel_subsys);



static struct attribute * kernel_attrs[] = {

#ifdef CONFIG_HOTPLUG

	&hotplug_seqnum_attr.attr,

#endif

#ifdef CONFIG_KEXEC

	&crash_notes_attr.attr,

#endif

	NULL

};