From 3de668ee8d5b1e08da3200f926ff5a28aeb99bc2 Mon Sep 17 00:00:00 2001
From: Robert Richter <robert.richter@amd.com>
Date: Mon, 3 May 2010 15:00:25 +0200
Subject: [PATCH] oprofile/x86: notify cpus only when daemon is running
This patch moves the cpu notifier registration from nmi_init() to
nmi_setup(). The corresponding unregistration function is now in
nmi_shutdown(). Thus, the hotplug code is only active, if the oprofile
daemon is running.
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Robert Richter <robert.richter@amd.com>
---
arch/x86/oprofile/nmi_int.c | 16 +++-------------
1 file changed, 3 insertions(+), 13 deletions(-)
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 7de0572b0a5e..2a086726cad1 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -504,6 +504,7 @@ static int nmi_setup(void)
goto fail;
get_online_cpus();
+ register_cpu_notifier(&oprofile_cpu_nb);
on_each_cpu(nmi_cpu_setup, NULL, 1);
nmi_enabled = 1;
put_online_cpus();
@@ -519,6 +520,7 @@ static void nmi_shutdown(void)
struct op_msrs *msrs;
get_online_cpus();
+ unregister_cpu_notifier(&oprofile_cpu_nb);
on_each_cpu(nmi_cpu_shutdown, NULL, 1);
nmi_enabled = 0;
ctr_running = 0;
@@ -739,12 +741,6 @@ int __init op_nmi_init(struct oprofile_operations *ops)
return -ENODEV;
}
- get_online_cpus();
- register_cpu_notifier(&oprofile_cpu_nb);
- nmi_enabled = 0;
- ctr_running = 0;
- put_online_cpus();
-
/* default values, can be overwritten by model */
ops->create_files = nmi_create_files;
ops->setup = nmi_setup;
@@ -771,14 +767,8 @@ int __init op_nmi_init(struct oprofile_operations *ops)
void op_nmi_exit(void)
{
- if (using_nmi) {
+ if (using_nmi)
exit_sysfs();
- get_online_cpus();
- unregister_cpu_notifier(&oprofile_cpu_nb);
- nmi_enabled = 0;
- ctr_running = 0;
- put_online_cpus();
- }
if (model->exit)
model->exit();
}
--
2.30.9