linux-kernel - [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc

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Date:	Wed, 04 Jun 2008 15:33:17 -0500
From:	Cliff Wickman <cpw@....com>
To:	linux-kernel@...r.kernel.org
Cc:	jeremy@...p.org, mingo@...e.hu
Subject: [PATCH 1/1] x86 atomic operations: atomic_or_long atomic_inc_short



From: Cliff Wickman <cpw@....com>

Provide atomic operations for increment of a 16-bit integer and
logical OR into a 64-bit integer.

[ This patch was split off of patch:
    SGI UV: TLB shootdown using broadcast assist unit
  and improved with advice from Jeremy Fitzhardinge <jeremy@...p.org> ]

Diffed against 2.6.26-rc4

Signed-off-by: Cliff Wickman <cpw@....com>

---
 include/asm-x86/atomic_64.h |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

Index: linux/include/asm-x86/atomic_64.h
===================================================================
--- linux.orig/include/asm-x86/atomic_64.h
+++ linux/include/asm-x86/atomic_64.h
@@ -431,6 +431,32 @@ static inline int atomic64_add_unless(at
 	return c != (u);
 }
 
+/**
+ * atomic_inc_short - increment of a short integer
+ * @v: pointer to type int
+ *
+ * Atomically adds 1 to @v
+ * Returns the new value of @u
+ */
+static inline short int atomic_inc_short(short int *v)
+{
+	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));
+	return *v;
+}
+
+/**
+ * atomic_or_long - OR of two long integers
+ * @v1: pointer to type unsigned long
+ * @v2: pointer to type unsigned long
+ *
+ * Atomically ORs @v1 and @v2
+ * Returns the result of the OR
+ */
+static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
+{
+	asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));
+}
+
 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
 
 /* These are x86-specific, used by some header files */
--
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