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Merge branch 'x86-spinlocks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 spinlock update from Ingo Molnar:
 "Convert an NMI lock to raw"

[ Clarification: it's not that the lock itself is NMI-safe, it's about
  NMI registration called from RT contexts  - Linus ]

* 'x86-spinlocks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/nmi: Use raw lock
This commit is contained in:
Linus Torvalds 2017-09-04 11:13:56 -07:00
commit e0a195b522
1 changed files with 9 additions and 9 deletions
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18
arch/x86/kernel/nmi.c
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@ -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);