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
_