63d3a75d6f
It is useful for a pv_lock_ops backend to know whether interrupts are enabled or not in the context a spin_lock is being called. This allows it to enable interrupts while spinning, which could be particularly helpful when spinning becomes blocking. The default implementation just calls the normal spin_lock op, ignoring the flags. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
38 lines
980 B
C
38 lines
980 B
C
/*
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* Split spinlock implementation out into its own file, so it can be
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* compiled in a FTRACE-compatible way.
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*/
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#include <linux/spinlock.h>
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#include <linux/module.h>
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#include <asm/paravirt.h>
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static void default_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags)
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{
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__raw_spin_lock(lock);
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}
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struct pv_lock_ops pv_lock_ops = {
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#ifdef CONFIG_SMP
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.spin_is_locked = __ticket_spin_is_locked,
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.spin_is_contended = __ticket_spin_is_contended,
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.spin_lock = __ticket_spin_lock,
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.spin_lock_flags = default_spin_lock_flags,
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.spin_trylock = __ticket_spin_trylock,
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.spin_unlock = __ticket_spin_unlock,
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#endif
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};
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EXPORT_SYMBOL_GPL(pv_lock_ops);
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void __init paravirt_use_bytelocks(void)
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{
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#ifdef CONFIG_SMP
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pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
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pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
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pv_lock_ops.spin_lock = __byte_spin_lock;
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pv_lock_ops.spin_trylock = __byte_spin_trylock;
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pv_lock_ops.spin_unlock = __byte_spin_unlock;
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#endif
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}
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