Commit-ID: 90b14889d2f9b29d7e5b4b2d36251c13ce3dd13f
Gitweb: http://git.kernel.org/tip/90b14889d2f9b29d7e5b4b2d36251c13ce3dd13f
Author: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
AuthorDate: Thu, 3 Nov 2016 15:49:58 +0100
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 9 Nov 2016 23:45:26 +0100
kernel/printk: Convert to hotplug state machine
Install the callbacks via the state machine.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: rt@xxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20161103145021.28528-3-bigeasy@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/cpuhotplug.h | 1 +
kernel/printk/printk.c | 29 +++++++++++++----------------
2 files changed, 14 insertions(+), 16 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 69b74fa..4174083 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -31,6 +31,7 @@ enum cpuhp_state {
CPUHP_S390_PFAULT_DEAD,
CPUHP_BLK_MQ_DEAD,
CPUHP_FS_BUFF_DEAD,
+ CPUHP_PRINTK_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index de08fc9..4487ffc 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2185,27 +2185,18 @@ void resume_console(void)
/**
* console_cpu_notify - print deferred console messages after CPU hotplug
- * @self: notifier struct
- * @action: CPU hotplug event
- * @hcpu: unused
+ * @cpu: unused
*
* If printk() is called from a CPU that is not online yet, the messages
* will be spooled but will not show up on the console. This function is
* called when a new CPU comes online (or fails to come up), and ensures
* that any such output gets printed.
*/
-static int console_cpu_notify(struct notifier_block *self,
- unsigned long action, void *hcpu)
-{
- switch (action) {
- case CPU_ONLINE:
- case CPU_DEAD:
- case CPU_DOWN_FAILED:
- case CPU_UP_CANCELED:
- console_lock();
- console_unlock();
- }
- return NOTIFY_OK;
+static int console_cpu_notify(unsigned int cpu)
+{
+ console_lock();
+ console_unlock();
+ return 0;
}
/**
@@ -2843,6 +2834,7 @@ EXPORT_SYMBOL(unregister_console);
static int __init printk_late_init(void)
{
struct console *con;
+ int ret;
for_each_console(con) {
if (!keep_bootcon && con->flags & CON_BOOT) {
@@ -2857,7 +2849,12 @@ static int __init printk_late_init(void)
unregister_console(con);
}
}
- hotcpu_notifier(console_cpu_notify, 0);
+ ret = cpuhp_setup_state_nocalls(CPUHP_PRINTK_DEAD, "printk:dead", NULL,
+ console_cpu_notify);
+ WARN_ON(ret < 0);
+ ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "printk:online",
+ console_cpu_notify, NULL);
+ WARN_ON(ret < 0);
return 0;
}
late_initcall(printk_late_init);
--
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