From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Tue, 1 Dec 2009 18:15:27 +0000 (-0800)
Subject: Add missing atomic64 compat helpers for 32-bit systems.
X-Git-Tag: zfs-0.8.0-rc1~152^2~639
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a5d6f6020aeeebfabd0bb5e48d8736d63b44b875;p=zfs

Add missing atomic64 compat helpers for 32-bit systems.

The use of these functions was added with the recent atomic work
and not tested on 32-bit systems.  Add the missing compat functions:
atomic64_inc, atomic64_dec, atomic64_add_return, atomic64_sub_return,
atomic64_inc_return, atomic64_dec_return.
---

diff --git a/include/asm/atomic_compat.h b/include/asm/atomic_compat.h
index c769d6248..5eaccd7e7 100644
--- a/include/asm/atomic_compat.h
+++ b/include/asm/atomic_compat.h
@@ -32,6 +32,38 @@ static inline void atomic64_sub(__s64 i, atomic64_t *v)
 	spin_unlock_irqrestore(&v->lock, flags);
 }
 
+#define atomic64_inc(v)		(atomic64_add(1, (v)))
+#define atomic64_dec(v)		(atomic64_sub(1, (v)))
+
+static inline __s64 atomic64_add_return(__s64 i, atomic64_t *v)
+{
+	unsigned long flags;
+	__s64 ret;
+
+	spin_lock_irqsave(&v->lock, flags);
+	v->val += i;
+	ret = v->val;
+	spin_unlock_irqrestore(&v->lock, flags);
+
+	return ret;
+}
+
+static inline __s64 atomic64_sub_return(__s64 i, atomic64_t *v)
+{
+	unsigned long flags;
+	__s64 ret;
+
+	spin_lock_irqsave(&v->lock, flags);
+	v->val -= i;
+	ret = v->val;
+	spin_unlock_irqrestore(&v->lock, flags);
+
+	return ret;
+}
+
+#define atomic64_inc_return(v)	(atomic64_add_return(1, (v)))
+#define atomic64_dec_return(v)	(atomic64_sub_return(1, (v)))
+
 static inline __s64 atomic64_read(atomic64_t *v)
 {
 	unsigned long flags;