linux-kernel - [RESEND PATCH] m68k: cmpxchg: Use swap() to improve __arch

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Message-ID: <20240820225901.135628-2-thorsten.blum@toblux.com>
Date: Wed, 21 Aug 2024 00:59:02 +0200
From: Thorsten Blum <thorsten.blum@...lux.com>
To: geert@...ux-m68k.org
Cc: linux-m68k@...ts.linux-m68k.org,
	linux-kernel@...r.kernel.org,
	Thorsten Blum <thorsten.blum@...lux.com>
Subject: [RESEND PATCH] m68k: cmpxchg: Use swap() to improve __arch_xchg()

Remove the local variable tmp and use the swap() macro.

Signed-off-by: Thorsten Blum <thorsten.blum@...lux.com>
---
 arch/m68k/include/asm/cmpxchg.h | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/m68k/include/asm/cmpxchg.h b/arch/m68k/include/asm/cmpxchg.h
index 4ba14f3535fc..71fbe5c5c564 100644
--- a/arch/m68k/include/asm/cmpxchg.h
+++ b/arch/m68k/include/asm/cmpxchg.h
@@ -3,6 +3,7 @@
 #define __ARCH_M68K_CMPXCHG__
 
 #include <linux/irqflags.h>
+#include <linux/minmax.h>
 
 #define __xg(type, x) ((volatile type *)(x))
 
@@ -11,25 +12,19 @@ extern unsigned long __invalid_xchg_size(unsigned long, volatile void *, int);
 #ifndef CONFIG_RMW_INSNS
 static inline unsigned long __arch_xchg(unsigned long x, volatile void * ptr, int size)
 {
-	unsigned long flags, tmp;
+	unsigned long flags;
 
 	local_irq_save(flags);
 
 	switch (size) {
 	case 1:
-		tmp = *(u8 *)ptr;
-		*(u8 *)ptr = x;
-		x = tmp;
+		swap(*(u8 *)ptr, x);
 		break;
 	case 2:
-		tmp = *(u16 *)ptr;
-		*(u16 *)ptr = x;
-		x = tmp;
+		swap(*(u16 *)ptr, x);
 		break;
 	case 4:
-		tmp = *(u32 *)ptr;
-		*(u32 *)ptr = x;
-		x = tmp;
+		swap(*(u32 *)ptr, x);
 		break;
 	default:
 		x = __invalid_xchg_size(x, ptr, size);
-- 
2.46.0