linux-kernel - [PATCH V9 09/15] riscv: cmpxchg: Optimize cmpxchg64

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Date:   Mon,  8 Aug 2022 03:13:12 -0400
From:   guoren@...nel.org
To:     palmer@...osinc.com, heiko@...ech.de, hch@...radead.org,
        arnd@...db.de, peterz@...radead.org, will@...nel.org,
        boqun.feng@...il.com, longman@...hat.com, shorne@...il.com,
        conor.dooley@...rochip.com
Cc:     linux-csky@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Guo Ren <guoren@...ux.alibaba.com>, Guo Ren <guoren@...nel.org>
Subject: [PATCH V9 09/15] riscv: cmpxchg: Optimize cmpxchg64

From: Guo Ren <guoren@...ux.alibaba.com>

Optimize cmpxchg64 with relaxed, acquire, release implementation.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/include/asm/cmpxchg.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h
index 14c9280c7f7f..4b5fa25f4336 100644
--- a/arch/riscv/include/asm/cmpxchg.h
+++ b/arch/riscv/include/asm/cmpxchg.h
@@ -226,6 +226,24 @@
 	(__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr))))
 
 #ifdef CONFIG_64BIT
+#define arch_cmpxchg64_relaxed(ptr, o, n)				\
+({									\
+	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
+	arch_cmpxchg_relaxed((ptr), (o), (n));				\
+})
+
+#define arch_cmpxchg64_acquire(ptr, o, n)				\
+({									\
+	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
+	arch_cmpxchg_acquire((ptr), (o), (n));				\
+})
+
+#define arch_cmpxchg64_release(ptr, o, n)				\
+({									\
+	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
+	arch_cmpxchg_release((ptr), (o), (n));				\
+})
+
 #define arch_cmpxchg64(ptr, o, n)					\
 ({									\
 	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
-- 
2.36.1