From: Andrew Morton <akpm@osdl.org>
Display the most-recently-opened sysfs file's name when oopsing.
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
arch/i386/kernel/traps.c | 3 +++
fs/sysfs/file.c | 8 ++++++++
2 files changed, 11 insertions(+)
diff -puN fs/sysfs/file.c~sysfs-crash-debugging fs/sysfs/file.c
--- devel/fs/sysfs/file.c~sysfs-crash-debugging 2005-09-03 16:19:53.000000000 -0700
+++ devel-akpm/fs/sysfs/file.c 2005-09-03 16:19:53.000000000 -0700
@@ -7,6 +7,8 @@
#include <linux/kobject.h>
#include <linux/namei.h>
#include <linux/ctype.h>
+#include <linux/limits.h>
+
#include <asm/uaccess.h>
#include <asm/semaphore.h>
@@ -342,8 +344,14 @@ static int check_perm(struct inode * ino
return error;
}
+char last_sysfs_file[PATH_MAX];
+
static int sysfs_open_file(struct inode * inode, struct file * filp)
{
+ char *p = d_path(filp->f_dentry, sysfs_mount, last_sysfs_file,
+ sizeof(last_sysfs_file));
+ if (p)
+ memmove(last_sysfs_file, p, strlen(p) + 1);
return check_perm(inode,filp);
}
diff -puN arch/i386/kernel/traps.c~sysfs-crash-debugging arch/i386/kernel/traps.c
--- devel/arch/i386/kernel/traps.c~sysfs-crash-debugging 2005-09-03 16:19:53.000000000 -0700
+++ devel-akpm/arch/i386/kernel/traps.c 2005-09-03 16:19:53.000000000 -0700
@@ -96,6 +96,8 @@ static int kstack_depth_to_print = 24;
struct notifier_block *i386die_chain;
static DEFINE_SPINLOCK(die_notifier_lock);
+extern char last_sysfs_file[];
+
int register_die_notifier(struct notifier_block *nb)
{
int err = 0;
@@ -368,6 +370,7 @@ void die(const char * str, struct pt_reg
#endif
if (nl)
printk("\n");
+ printk(KERN_ALERT "last sysfs file: %s\n", last_sysfs_file);
#ifdef CONFIG_KGDB
/* This is about the only place we want to go to kgdb even if in
* user mode. But we must go in via a trap so within kgdb we will
_