2.5.44: lkcd (2/9): dump notifier

Dump notification additions, similar to panic lists, but for dump
specific modules (per design).

 sys.c |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+)

diff -Naur linux-2.5.44.orig/kernel/sys.c linux-2.5.44.lkcd/kernel/sys.c
--- linux-2.5.44.orig/kernel/sys.c	Fri Oct 18 21:01:11 2002
+++ linux-2.5.44.lkcd/kernel/sys.c	Sat Oct 19 12:39:15 2002
@@ -19,6 +19,7 @@
 #include <linux/workqueue.h>
 #include <linux/device.h>
 #include <linux/times.h>
+#include <linux/dump.h>
 #include <linux/security.h>
 #include <linux/dcookies.h>
 
@@ -77,6 +78,7 @@
  */
 
 static struct notifier_block *reboot_notifier_list;
+struct notifier_block *dump_notifier_list;
 rwlock_t notifier_lock = RW_LOCK_UNLOCKED;
 
 /**
@@ -195,6 +197,37 @@
 	return notifier_chain_unregister(&reboot_notifier_list, nb);
 }
 
+/**
+ *	register_dump_notifier - Register function to be called at dump time
+ *	@nb: Info about notifier function to be called
+ *
+ *	Registers a function with the list of functions
+ *	to be called at dump time.
+ *
+ *	Currently always returns zero, as notifier_chain_register
+ *	always returns zero.
+ */
+ 
+int register_dump_notifier(struct notifier_block * nb)
+{
+	return notifier_chain_register(&dump_notifier_list, nb);
+}
+
+/**
+ *	unregister_dump_notifier - Unregister previously registered dump notifier
+ *	@nb: Hook to be unregistered
+ *
+ *	Unregisters a previously registered dump
+ *	notifier function.
+ *
+ *	Returns zero on success, or %-ENOENT on failure.
+ */
+ 
+int unregister_dump_notifier(struct notifier_block * nb)
+{
+	return notifier_chain_unregister(&dump_notifier_list, nb);
+}
+
 asmlinkage long sys_ni_syscall(void)
 {
 	return -ENOSYS;
@@ -1384,3 +1417,6 @@
 EXPORT_SYMBOL(unregister_reboot_notifier);
 EXPORT_SYMBOL(in_group_p);
 EXPORT_SYMBOL(in_egroup_p);
+EXPORT_SYMBOL(register_dump_notifier);
+EXPORT_SYMBOL(unregister_dump_notifier);
+EXPORT_SYMBOL(dump_notifier_list);
-
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