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          |    7 +++++++
 2 files changed, 10 insertions(+)

diff -puN fs/sysfs/file.c~sysfs-crash-debugging fs/sysfs/file.c
--- 25/fs/sysfs/file.c~sysfs-crash-debugging	2005-07-12 05:19:19.000000000 -0600
+++ 25-akpm/fs/sysfs/file.c	2005-07-12 05:30:28.000000000 -0600
@@ -6,6 +6,8 @@
 #include <linux/fsnotify.h>
 #include <linux/kobject.h>
 #include <linux/namei.h>
+#include <linux/limits.h>
+
 #include <asm/uaccess.h>
 #include <asm/semaphore.h>
 
@@ -324,8 +326,13 @@ 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)
 {
+	d_path(filp->f_dentry, sysfs_mount, last_sysfs_file,
+			sizeof(last_sysfs_file));
+
 	return check_perm(inode,filp);
 }
 
diff -puN arch/i386/kernel/traps.c~sysfs-crash-debugging arch/i386/kernel/traps.c
--- 25/arch/i386/kernel/traps.c~sysfs-crash-debugging	2005-07-12 05:19:19.000000000 -0600
+++ 25-akpm/arch/i386/kernel/traps.c	2005-07-12 05:30:38.000000000 -0600
@@ -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;
@@ -370,6 +372,7 @@ 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
_