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Message-Id: <20240805192119.56816-3-paulmck@kernel.org>
Date: Mon, 5 Aug 2024 12:21:19 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: linux-arch@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: elver@...gle.com,
akpm@...ux-foundation.org,
tglx@...utronix.de,
peterz@...radead.org,
torvalds@...ux-foundation.org,
arnd@...db.de,
geert@...ux-m68k.org,
palmer@...osinc.com,
mhiramat@...nel.org,
linux-sh@...r.kernel.org,
linux-snps-arc@...ts.infradead.org,
"Paul E. McKenney" <paulmck@...nel.org>,
Andi Shyti <andi.shyti@...ux.intel.com>
Subject: [PATCH cmpxchg 3/3] sh: Emulate one-byte cmpxchg
Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on sh.
[ paulmck: Drop two-byte support per Arnd Bergmann feedback. ]
[ paulmck: Apply feedback from Naresh Kamboju. ]
[ Apply Geert Uytterhoeven feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: Andi Shyti <andi.shyti@...ux.intel.com>
Cc: Palmer Dabbelt <palmer@...osinc.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: <linux-sh@...r.kernel.org>
---
arch/sh/Kconfig | 1 +
arch/sh/include/asm/cmpxchg.h | 3 +++
2 files changed, 4 insertions(+)
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 1aa3c4a0c5b27..e9103998cca91 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -14,6 +14,7 @@ config SUPERH
select ARCH_HIBERNATION_POSSIBLE if MMU
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_WANT_IPC_PARSE_VERSION
+ select ARCH_NEED_CMPXCHG_1_EMU
select CPU_NO_EFFICIENT_FFS
select DMA_DECLARE_COHERENT
select GENERIC_ATOMIC64
diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h
index 5d617b3ef78f7..1e5dc5ccf7bf5 100644
--- a/arch/sh/include/asm/cmpxchg.h
+++ b/arch/sh/include/asm/cmpxchg.h
@@ -9,6 +9,7 @@
#include <linux/compiler.h>
#include <linux/types.h>
+#include <linux/cmpxchg-emu.h>
#if defined(CONFIG_GUSA_RB)
#include <asm/cmpxchg-grb.h>
@@ -56,6 +57,8 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
unsigned long new, int size)
{
switch (size) {
+ case 1:
+ return cmpxchg_emu_u8(ptr, old, new);
case 4:
return __cmpxchg_u32(ptr, old, new);
}
--
2.40.1
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