linux-kernel - [tip:x86/spinlocks] x86/nmi: Use raw lock

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Message-ID: <tip-c455fd9235b6bd2802db86109cfa0ec105992f68@git.kernel.org>
Date:   Wed, 16 Aug 2017 11:42:43 -0700
From:   tip-bot for Scott Wood <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, swood@...hat.com, linux-kernel@...r.kernel.org,
        dzickus@...hat.com, mingo@...nel.org, tglx@...utronix.de
Subject: [tip:x86/spinlocks] x86/nmi: Use raw lock

Commit-ID:  c455fd9235b6bd2802db86109cfa0ec105992f68
Gitweb:     http://git.kernel.org/tip/c455fd9235b6bd2802db86109cfa0ec105992f68
Author:     Scott Wood <swood@...hat.com>
AuthorDate: Mon, 24 Jul 2017 16:32:42 -0500
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 16 Aug 2017 20:40:09 +0200

x86/nmi: Use raw lock

register_nmi_handler() can be called from PREEMPT_RT atomic context
(e.g. wakeup_cpu_via_init_nmi() or native_stop_other_cpus()), and thus
ordinary spinlocks cannot be used.

Signed-off-by: Scott Wood <swood@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Don Zickus <dzickus@...hat.com>
Link: http://lkml.kernel.org/r/20170724213242.27598-1-swood@redhat.com

---
 arch/x86/kernel/nmi.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 446c8aa..35aafc9 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -39,26 +39,26 @@
 #include <trace/events/nmi.h>
 
 struct nmi_desc {
-	spinlock_t lock;
+	raw_spinlock_t lock;
 	struct list_head head;
 };
 
 static struct nmi_desc nmi_desc[NMI_MAX] = 
 {
 	{
-		.lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[0].lock),
+		.lock = __RAW_SPIN_LOCK_UNLOCKED(&nmi_desc[0].lock),
 		.head = LIST_HEAD_INIT(nmi_desc[0].head),
 	},
 	{
-		.lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[1].lock),
+		.lock = __RAW_SPIN_LOCK_UNLOCKED(&nmi_desc[1].lock),
 		.head = LIST_HEAD_INIT(nmi_desc[1].head),
 	},
 	{
-		.lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[2].lock),
+		.lock = __RAW_SPIN_LOCK_UNLOCKED(&nmi_desc[2].lock),
 		.head = LIST_HEAD_INIT(nmi_desc[2].head),
 	},
 	{
-		.lock = __SPIN_LOCK_UNLOCKED(&nmi_desc[3].lock),
+		.lock = __RAW_SPIN_LOCK_UNLOCKED(&nmi_desc[3].lock),
 		.head = LIST_HEAD_INIT(nmi_desc[3].head),
 	},
 
@@ -163,7 +163,7 @@ int __register_nmi_handler(unsigned int type, struct nmiaction *action)
 
 	init_irq_work(&action->irq_work, nmi_max_handler);
 
-	spin_lock_irqsave(&desc->lock, flags);
+	raw_spin_lock_irqsave(&desc->lock, flags);
 
 	/*
 	 * Indicate if there are multiple registrations on the
@@ -181,7 +181,7 @@ int __register_nmi_handler(unsigned int type, struct nmiaction *action)
 	else
 		list_add_tail_rcu(&action->list, &desc->head);
 	
-	spin_unlock_irqrestore(&desc->lock, flags);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
 	return 0;
 }
 EXPORT_SYMBOL(__register_nmi_handler);
@@ -192,7 +192,7 @@ void unregister_nmi_handler(unsigned int type, const char *name)
 	struct nmiaction *n;
 	unsigned long flags;
 
-	spin_lock_irqsave(&desc->lock, flags);
+	raw_spin_lock_irqsave(&desc->lock, flags);
 
 	list_for_each_entry_rcu(n, &desc->head, list) {
 		/*
@@ -207,7 +207,7 @@ void unregister_nmi_handler(unsigned int type, const char *name)
 		}
 	}
 
-	spin_unlock_irqrestore(&desc->lock, flags);
+	raw_spin_unlock_irqrestore(&desc->lock, flags);
 	synchronize_rcu();
 }
 EXPORT_SYMBOL_GPL(unregister_nmi_handler);