[Crash-utility] waitq command does not work on RHEL5 and later (2.6.18 kernel)

[Alan Tyson]

Hello,

I notice that struct __wait_queue changed somewhere around 2.6.15 and as
a result the waitq command fails because of the missing member "task"
which was replaced by the member "private" containing the same information.

 > crash>  waitq f75b9ac8
 >
 > waitq: invalid structure member offset: __wait_queue_task
 >        FILE: kernel.c  LINE: 5429  FUNCTION: dump_waitq()
 > << snipped >>

The attached patch fixes this, tested on RHEL4 and RHEL5 i686 only.

Regards,
Alan Tyson, HP.

--- kernel.c.orig	2007-10-30 15:51:54.000000000 +0000
+++ kernel.c	2007-11-06 10:12:25.000000000 +0000
@@ -390,8 +390,12 @@ kernel_init()
 
         STRUCT_SIZE_INIT(__wait_queue, "__wait_queue");
         if (VALID_STRUCT(__wait_queue)) {
-                MEMBER_OFFSET_INIT(__wait_queue_task,
-                        "__wait_queue", "task");
+		if (MEMBER_EXISTS("__wait_queue", "task"))
+			MEMBER_OFFSET_INIT(__wait_queue_task,
+				"__wait_queue", "task");
+		else
+			MEMBER_OFFSET_INIT(__wait_queue_task,
+				"__wait_queue", "private");
                 MEMBER_OFFSET_INIT(__wait_queue_head_task_list,
                         "__wait_queue_head", "task_list");
                 MEMBER_OFFSET_INIT(__wait_queue_task_list,