From 71c7356f864dc41e4bd6b884596a422f8954afe0 Mon Sep 17 00:00:00 2001
From: "Luck, Tony" <tony.luck@intel.com>
Date: Tue, 3 Sep 2013 15:31:21 -0700
Subject: [PATCH] lockref: Implement lockref for Itanium
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>
---
arch/ia64/Kconfig | 1 +
arch/ia64/include/asm/spinlock.h | 5 +++++
2 files changed, 6 insertions(+)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index b36370d3eab9..566642266324 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 54ff557d474e..45698cd15b7b 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);
--
2.34.1