From c7178cdecdbef8321f418fac55f3afaca3bb4c96 Mon Sep 17 00:00:00 2001
From: Mark Rutland <mark.rutland@arm.com>
Date: Tue, 25 May 2021 15:02:02 +0100
Subject: locking/atomic: h8300: use asm-generic exclusively

As h8300's implementation of the atomics isn't using any arch-specific
functionality, and its implementation of cmpxchg only uses assembly to
non-atomically swap two elements in memory, we may as well use the
asm-generic atomic.h and cmpxchg.h, and avoid the duplicate code.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210525140232.53872-4-mark.rutland@arm.com
---
 arch/h8300/include/asm/cmpxchg.h | 66 ----------------------------------------
 1 file changed, 66 deletions(-)
 delete mode 100644 arch/h8300/include/asm/cmpxchg.h

(limited to 'arch/h8300/include/asm/cmpxchg.h')

diff --git a/arch/h8300/include/asm/cmpxchg.h b/arch/h8300/include/asm/cmpxchg.h
deleted file mode 100644
index c64bb38ce242..000000000000
--- a/arch/h8300/include/asm/cmpxchg.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ARCH_H8300_CMPXCHG__
-#define __ARCH_H8300_CMPXCHG__
-
-#include <linux/irqflags.h>
-
-#define xchg(ptr, x) \
-	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
-				    sizeof(*(ptr))))
-
-struct __xchg_dummy { unsigned long a[100]; };
-#define __xg(x) ((volatile struct __xchg_dummy *)(x))
-
-static inline unsigned long __xchg(unsigned long x,
-				   volatile void *ptr, int size)
-{
-	unsigned long tmp, flags;
-
-	local_irq_save(flags);
-
-	switch (size) {
-	case 1:
-		__asm__ __volatile__
-			("mov.b %2,%0\n\t"
-			 "mov.b %1,%2"
-			 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
-		break;
-	case 2:
-		__asm__ __volatile__
-			("mov.w %2,%0\n\t"
-			 "mov.w %1,%2"
-			 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
-		break;
-	case 4:
-		__asm__ __volatile__
-			("mov.l %2,%0\n\t"
-			 "mov.l %1,%2"
-			 : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
-		break;
-	default:
-		tmp = 0;
-	}
-	local_irq_restore(flags);
-	return tmp;
-}
-
-#include <asm-generic/cmpxchg-local.h>
-
-/*
- * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
- * them available.
- */
-#define cmpxchg_local(ptr, o, n)					 \
-	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),		 \
-						     (unsigned long)(o), \
-						     (unsigned long)(n), \
-						     sizeof(*(ptr))))
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
-
-#ifndef CONFIG_SMP
-#include <asm-generic/cmpxchg.h>
-#endif
-
-#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
-
-#endif /* __ARCH_H8300_CMPXCHG__ */
-- 
cgit