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lockref: Implement lockref for Itanium

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All the cool kids are doing this, join in the fun.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luck, Tony 2013-09-03 15:31:21 -07:00 committed by Linus Torvalds
parent 977dbfcf8e
commit 71c7356f86
2 changed files with 6 additions and 0 deletions
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1
arch/ia64/Kconfig
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@ -43,6 +43,7 @@ config IA64
select SYSCTL_ARCH_UNALIGN_NO_WARN
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select ARCH_USE_CMPXCHG_LOCKREF
default y
help
The Itanium Processor Family is Intel's 64-bit successor to

5
arch/ia64/include/asm/spinlock.h
View File

@ -102,6 +102,11 @@ static inline int __ticket_spin_is_contended(arch_spinlock_t *lock)
return ((tmp - (tmp >> TICKET_SHIFT)) & TICKET_MASK) > 1;
}
static __always_inline int arch_spin_value_unlocked(arch_spinlock_t lock)
{
return !(((lock.lock >> TICKET_SHIFT) ^ lock.lock) & TICKET_MASK);
}
static inline int arch_spin_is_locked(arch_spinlock_t *lock)
{
return __ticket_spin_is_locked(lock);