From b9dc76e232e0226a14ae3089e3be5c915f2bb981 Mon Sep 17 00:00:00 2001

From: Lianbo Jiang <lijiang@redhat.com>

Date: Mon, 10 Jan 2022 17:25:06 +0800

Subject: [PATCH 03/10] Fix for HZ calculation on Linux 5.14 and later

Kernel commit 3e9a99eba058 ("block/mq-deadline: Rename dd_init_queue()

and dd_exit_queue()") renamed dd_init_queue to dd_init_sched. Without

the patch, the 'help -m' may print incorrect hz value as follows:

crash> help -m | grep hz

       hz: 1000    <---The correct hz value on ppc64le machine is 100.

	   ^^^^

Fixes: b93027ce5c75 ("Add alternate HZ calculation using write_expire")

Signed-off-by: Lianbo Jiang <lijiang@redhat.com>

---

 task.c | 2 ++

 1 file changed, 2 insertions(+)

diff --git a/task.c b/task.c

index b5ddc88e0acb..76e184ae70b1 100644

--- a/task.c

+++ b/task.c

@@ -440,6 +440,8 @@ task_init(void)

 		}

 	} else if ((symbol_exists("dd_init_queue") &&

 	    gdb_set_crash_scope(symbol_value("dd_init_queue"), "dd_init_queue")) ||

+	    (symbol_exists("dd_init_sched") &&

+	    gdb_set_crash_scope(symbol_value("dd_init_sched"), "dd_init_sched")) ||

 	    (symbol_exists("deadline_init_queue") &&

 	    gdb_set_crash_scope(symbol_value("deadline_init_queue"), "deadline_init_queue"))) {

 		char buf[BUFSIZE];

-- 

2.20.1