linux-kernel - [PATCH 3/8] sparc32: unify __cmpxchg

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Message-Id: <20240402042835.11815-3-viro@zeniv.linux.org.uk>
Date: Tue,  2 Apr 2024 00:28:30 -0400
From: Al Viro <viro@...iv.linux.org.uk>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	"David S. Miller" <davem@...emloft.net>,
	Andreas Larsson <andreas@...sler.com>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Arnd Bergmann <arnd@...db.de>,
	Marco Elver <elver@...gle.com>
Subject: [PATCH 3/8] sparc32: unify __cmpxchg_u{32,64}

Add a macro that expands to one of those when given u32 or u64
as an argument - atomic32.c has a lot of similar stuff already.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 arch/sparc/lib/atomic32.c | 41 +++++++++++++++------------------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/arch/sparc/lib/atomic32.c b/arch/sparc/lib/atomic32.c
index e15affbbb523..0d215a772428 100644
--- a/arch/sparc/lib/atomic32.c
+++ b/arch/sparc/lib/atomic32.c
@@ -159,32 +159,23 @@ unsigned long sp32___change_bit(unsigned long *addr, unsigned long mask)
 }
 EXPORT_SYMBOL(sp32___change_bit);
 
-u32 __cmpxchg_u32(volatile u32 *ptr, u32 old, u32 new)
-{
-	unsigned long flags;
-	u32 prev;
-
-	spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
-	if ((prev = *ptr) == old)
-		*ptr = new;
-	spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
-
-	return prev;
-}
+#define CMPXCHG(T)						\
+	T __cmpxchg_##T(volatile T *ptr, T old, T new)		\
+	{							\
+		unsigned long flags;				\
+		T prev;						\
+								\
+		spin_lock_irqsave(ATOMIC_HASH(ptr), flags);	\
+		if ((prev = *ptr) == old)			\
+			*ptr = new;				\
+		spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);\
+								\
+		return prev;					\
+	}
+
+CMPXCHG(u32)
+CMPXCHG(u64)
 EXPORT_SYMBOL(__cmpxchg_u32);
-
-u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new)
-{
-	unsigned long flags;
-	u64 prev;
-
-	spin_lock_irqsave(ATOMIC_HASH(ptr), flags);
-	if ((prev = *ptr) == old)
-		*ptr = new;
-	spin_unlock_irqrestore(ATOMIC_HASH(ptr), flags);
-
-	return prev;
-}
 EXPORT_SYMBOL(__cmpxchg_u64);
 
 unsigned long __xchg_u32(volatile u32 *ptr, u32 new)
-- 
2.39.2