sysfs: crash debugging
Print the name of the last-accessed sysfs file when we oops, to help track
down oopses which occur in sysfs store/read handlers. Because these oopses
tend to not leave any trace of the offending code in the stack traces.
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
index 37fa241..8ec406a 100644
--- a/include/linux/sysfs.h
+++ b/include/linux/sysfs.h
@@ -119,6 +119,8 @@
void sysfs_notify(struct kobject *kobj, char *dir, char *attr);
+void sysfs_printk_last_file(void);
+
extern int __must_check sysfs_init(void);
#else /* CONFIG_SYSFS */
@@ -231,6 +233,10 @@
return 0;
}
+static inline void sysfs_printk_last_file(void)
+{
+}
+
#endif /* CONFIG_SYSFS */
#endif /* _SYSFS_H_ */