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| author |   Jeremy Fitzhardinge <jeremy@goop.org> | 2008-08-19 13:19:36 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-08-20 12:40:07 +0200 |
| commit | 63d3a75d6f1fcf2f33e6abbe84e1f428c3586152 (patch) | |
| tree | 3b7453c784b4fad0afe002942d48bfc876010999 /arch/x86/kernel/paravirt-spinlocks.c | |
| parent | xen: clean up domain mode predicates (diff) | |
| download | linux-dev-63d3a75d6f1fcf2f33e6abbe84e1f428c3586152.tar.xz linux-dev-63d3a75d6f1fcf2f33e6abbe84e1f428c3586152.zip | |
x86/paravirt: add spin_lock_flags lock op
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>
Diffstat (limited to 'arch/x86/kernel/paravirt-spinlocks.c')
| -rw-r--r-- | arch/x86/kernel/paravirt-spinlocks.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/paravirt-spinlocks.c b/arch/x86/kernel/paravirt-spinlocks.c index 38d7f7f1dbc9..206359a8e43f 100644 --- a/arch/x86/kernel/paravirt-spinlocks.c +++ b/arch/x86/kernel/paravirt-spinlocks.c @@ -7,12 +7,18 @@ #include <asm/paravirt.h> +static void default_spin_lock_flags(struct raw_spinlock *lock, unsigned long flags) +{ + __raw_spin_lock(lock); +} + struct pv_lock_ops pv_lock_ops = { #ifdef CONFIG_SMP .spin_is_locked = __ticket_spin_is_locked, .spin_is_contended = __ticket_spin_is_contended, .spin_lock = __ticket_spin_lock, + .spin_lock_flags = default_spin_lock_flags, .spin_trylock = __ticket_spin_trylock, .spin_unlock = __ticket_spin_unlock, #endif |