From: Luck, Tony Date: Tue, 3 Sep 2013 22:31:21 +0000 (-0700) Subject: lockref: Implement lockref for Itanium X-Git-Tag: upstream/snapshot3+hdmi~4439 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=71c7356f864dc41e4bd6b884596a422f8954afe0;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git lockref: Implement lockref for Itanium All the cool kids are doing this, join in the fun. Signed-off-by: Tony Luck Signed-off-by: Linus Torvalds --- diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index b36370d..5666422 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -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 diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h index 54ff557..45698cd 100644 --- a/arch/ia64/include/asm/spinlock.h +++ b/arch/ia64/include/asm/spinlock.h @@ -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);