From: kaigai@ak.jp.nec.com (Kaigai Kohei)
To: akpm@osdl.org, hugh@veritas.com, ak@muc.de
Cc: wli@holomorphy.com, takata.hirokazu@renesas.com,
kaigai@ak.jp.nec.com, linux-kernel@vger.kernel.org
Subject: [PATCH] atomic_inc_return() for x86_64[2/5] (Re: atomic_inc_return)
Date: Fri, 10 Sep 2004 12:27:45 +0900 (JST) [thread overview]
Message-ID: <200409100327.i8A3RjYV007102@mailsv.bs1.fc.nec.co.jp> (raw)
In-Reply-To: Your message of "Thu, 9 Sep 2004 20:48:27 +0100 (BST)". <Pine.LNX.4.44.0409092005430.14004-100000@localhost.localdomain>
[2/5] atomic_inc_return-linux-2.6.9-rc1.x86_64.patch
This patch implements atomic_inc_return() and so on for x86_64.
It is same as I posted to LKML and Andi Kleen at '04/09/01.
Signed-off-by: KaiGai, Kohei <kaigai@ak.jp.nec.com>
--------
Kai Gai <kaigai@ak.jp.nec.com>
diff -rNU4 linux-2.6.9-rc1/include/asm-x86_64/atomic.h linux-2.6.9-rc1.atomic_inc_return/include/asm-x86_64/atomic.h
--- linux-2.6.9-rc1/include/asm-x86_64/atomic.h 2004-08-24 16:03:38.000000000 +0900
+++ linux-2.6.9-rc1.atomic_inc_return/include/asm-x86_64/atomic.h 2004-09-10 10:15:18.000000000 +0900
@@ -177,8 +177,33 @@
:"ir" (i), "m" (v->counter) : "memory");
return c;
}
+/**
+ * atomic_add_return - add and return
+ * @v: pointer of type atomic_t
+ * @i: integer value to add
+ *
+ * Atomically adds @i to @v and returns @i + @v
+ */
+static __inline__ int atomic_add_return(int i, atomic_t *v)
+{
+ int __i = i;
+ __asm__ __volatile__(
+ LOCK "xaddl %0, %1;"
+ :"=r"(i)
+ :"m"(v->counter), "0"(i));
+ return i + __i;
+}
+
+static __inline__ int atomic_sub_return(int i, atomic_t *v)
+{
+ return atomic_add_return(-i,v);
+}
+
+#define atomic_inc_return(v) (atomic_add_return(1,v))
+#define atomic_dec_return(v) (atomic_sub_return(1,v))
+
/* These are x86-specific, used by some header files */
#define atomic_clear_mask(mask, addr) \
__asm__ __volatile__(LOCK "andl %0,%1" \
: : "r" (~(mask)),"m" (*addr) : "memory")
next prev parent reply other threads:[~2004-09-10 3:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44.0409092005430.14004-100000@localhost.localdomain>
2004-09-10 3:26 ` [PATCH] atomic_inc_return() for i386[1/5] " Kaigai Kohei
2004-09-10 5:34 ` Chris Wedgwood
2004-09-11 23:05 ` Andrew Morton
2004-09-12 8:25 ` Andi Kleen
2004-09-12 9:06 ` Andrew Morton
2004-09-10 3:27 ` Kaigai Kohei [this message]
2004-09-10 3:29 ` [PATCH] atomic_inc_return() for arm[3/5] " Kaigai Kohei
2004-09-10 3:30 ` [PATCH] atomic_inc_return() for arm26[1/5] " Kaigai Kohei
2004-09-10 3:32 ` [PATCH] atomic_inc_return() for sparc64[5/5] " Kaigai Kohei
2004-09-10 5:26 ` David S. Miller
2004-09-10 4:05 ` PATCH] atomic_inc_return() [0/5] " Kaigai Kohei
2004-09-10 6:37 ` Hugh Dickins
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