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Revision 2ee27796f298b710992a677a7e4d35c8c588b17e authored by Hans de Goede on 30 December 2018, 17:27:15 UTC, committed by Ingo Molnar on 19 April 2019, 17:23:13 UTC 
x86/cpu/intel: Lower the "ENERGY_PERF_BIAS: Set to normal" message's log priority
 
The "ENERGY_PERF_BIAS: Set to 'normal', was 'performance'" message triggers
on pretty much every Intel machine. The purpose of log messages with
a warning level is to notify the user of something which potentially is
a problem, or at least somewhat unexpected.

This message clearly does not match those criteria, so lower its log
priority from warning to info.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20181230172715.17469-1-hdegoede@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 1de7edb
Raw File
user-return-notifier.c 

#include <linux/user-return-notifier.h>
#include <linux/percpu.h>
#include <linux/sched.h>
#include <linux/export.h>

static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);

/*
 * Request a notification when the current cpu returns to userspace.  Must be
 * called in atomic context.  The notifier will also be called in atomic
 * context.
 */
void user_return_notifier_register(struct user_return_notifier *urn)
{
	set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
	hlist_add_head(&urn->link, this_cpu_ptr(&return_notifier_list));
}
EXPORT_SYMBOL_GPL(user_return_notifier_register);

/*
 * Removes a registered user return notifier.  Must be called from atomic
 * context, and from the same cpu registration occurred in.
 */
void user_return_notifier_unregister(struct user_return_notifier *urn)
{
	hlist_del(&urn->link);
	if (hlist_empty(this_cpu_ptr(&return_notifier_list)))
		clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
}
EXPORT_SYMBOL_GPL(user_return_notifier_unregister);

/* Calls registered user return notifiers */
void fire_user_return_notifiers(void)
{
	struct user_return_notifier *urn;
	struct hlist_node *tmp2;
	struct hlist_head *head;

	head = &get_cpu_var(return_notifier_list);
	hlist_for_each_entry_safe(urn, tmp2, head, link)
		urn->on_user_return(urn);
	put_cpu_var(return_notifier_list);
}
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