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	2005-08-08 21:43:26.000000000 -0700
+++ devel-akpm/fs/sysfs/file.c	2005-08-08 21:43:41.000000000 -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>
 
@@ -340,8 +342,14 @@ 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	2005-08-08 21:43:26.000000000 -0700
+++ devel-akpm/arch/i386/kernel/traps.c	2005-08-08 21:43:26.000000000 -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
_