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Message-Id: <20240821181011.2604152-1-paulmck@kernel.org>
Date: Wed, 21 Aug 2024 11:10:09 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: linux-arch@...r.kernel.org,
linux-kernel@...r.kernel.org,
elver@...gle.com
Cc: akpm@...ux-foundation.org,
tglx@...utronix.de,
peterz@...radead.org,
torvalds@...ux-foundation.org,
arnd@...db.de,
geert@...ux-m68k.org,
kernel-team@...a.com,
"Paul E. McKenney" <paulmck@...nel.org>,
Yujie Liu <yujie.liu@...el.com>,
Andi Shyti <andi.shyti@...ux.intel.com>
Subject: [PATCH v2 cmpxchg 1/3] xtensa: Emulate one-byte cmpxchg
Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on xtensa.
[ paulmck: Apply kernel test robot feedback. ]
[ paulmck: Drop two-byte support per Arnd Bergmann feedback. ]
[ Apply Geert Uytterhoeven feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Tested-by: Yujie Liu <yujie.liu@...el.com>
Cc: Andi Shyti <andi.shyti@...ux.intel.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
---
arch/xtensa/Kconfig | 1 +
arch/xtensa/include/asm/cmpxchg.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index f200a4ec044e6..d3db28f2f8110 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -14,6 +14,7 @@ config XTENSA
select ARCH_HAS_DMA_SET_UNCACHED if MMU
select ARCH_HAS_STRNCPY_FROM_USER if !KASAN
select ARCH_HAS_STRNLEN_USER
+ select ARCH_NEED_CMPXCHG_1_EMU
select ARCH_USE_MEMTEST
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h
index 675a11ea8de76..95e33a913962d 100644
--- a/arch/xtensa/include/asm/cmpxchg.h
+++ b/arch/xtensa/include/asm/cmpxchg.h
@@ -15,6 +15,7 @@
#include <linux/bits.h>
#include <linux/stringify.h>
+#include <linux/cmpxchg-emu.h>
/*
* cmpxchg
@@ -74,6 +75,7 @@ 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);
default: __cmpxchg_called_with_bad_pointer();
return old;
--
2.40.1
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