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[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: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vivek Goyal 2005-06-25 14:58:12 -07:00 committed by Linus Torvalds
parent cf13f0eaff
commit 625f1c8219
5 changed files with 23 additions and 5 deletions
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2
arch/i386/kernel/crash.c
View File

@ -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];

3
arch/x86_64/kernel/crash.c
View File

@ -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)

5
include/asm-i386/kexec.h
View File

@ -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 */

5
include/asm-x86_64/kexec.h
View File

@ -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 */

13
kernel/ksysfs.c
View File

@ -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
};