linux-kernel - [PATCH bpf-next 04/10] riscv: Separate toolchain support dependency from RISCV_ISA

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Message-Id: <20250719091730.2660197-5-pulehui@huaweicloud.com>
Date: Sat, 19 Jul 2025 09:17:24 +0000
From: Pu Lehui <pulehui@...weicloud.com>
To: bpf@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Cc: Björn Töpel <bjorn@...nel.org>,
	Puranjay Mohan <puranjay@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Alexandre Ghiti <alex@...ti.fr>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Pu Lehui <pulehui@...wei.com>
Subject: [PATCH bpf-next 04/10] riscv: Separate toolchain support dependency from RISCV_ISA_ZACAS

From: Pu Lehui <pulehui@...wei.com>

RV64 bpf is going to support ZACAS instructions. Let's separate
toolchain support dependency from RISCV_ISA_ZACAS.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
---
 arch/riscv/Kconfig               | 1 -
 arch/riscv/include/asm/cmpxchg.h | 6 ++++--
 arch/riscv/kernel/setup.c        | 1 +
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index d71ea0f4466f..191b5d372fdf 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -717,7 +717,6 @@ config TOOLCHAIN_HAS_ZACAS
 
 config RISCV_ISA_ZACAS
 	bool "Zacas extension support for atomic CAS"
-	depends on TOOLCHAIN_HAS_ZACAS
 	depends on RISCV_ALTERNATIVE
 	default y
 	help
diff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h
index 0b749e710216..4f4f389282b8 100644
--- a/arch/riscv/include/asm/cmpxchg.h
+++ b/arch/riscv/include/asm/cmpxchg.h
@@ -133,6 +133,7 @@
 ({										\
 	if (IS_ENABLED(CONFIG_RISCV_ISA_ZABHA) &&				\
 	    IS_ENABLED(CONFIG_RISCV_ISA_ZACAS) &&				\
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZACAS) &&				\
 	    riscv_has_extension_unlikely(RISCV_ISA_EXT_ZABHA) &&		\
 	    riscv_has_extension_unlikely(RISCV_ISA_EXT_ZACAS)) {		\
 		r = o;								\
@@ -180,6 +181,7 @@
 		       r, p, co, o, n)					\
 ({									\
 	if (IS_ENABLED(CONFIG_RISCV_ISA_ZACAS) &&			\
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZACAS) &&			\
 	    riscv_has_extension_unlikely(RISCV_ISA_EXT_ZACAS)) {	\
 		r = o;							\
 									\
@@ -315,7 +317,7 @@
 	arch_cmpxchg_release((ptr), (o), (n));				\
 })
 
-#if defined(CONFIG_64BIT) && defined(CONFIG_RISCV_ISA_ZACAS)
+#if defined(CONFIG_64BIT) && defined(CONFIG_RISCV_ISA_ZACAS) && defined(CONFIG_TOOLCHAIN_HAS_ZACAS)
 
 #define system_has_cmpxchg128()        riscv_has_extension_unlikely(RISCV_ISA_EXT_ZACAS)
 
@@ -351,7 +353,7 @@ union __u128_halves {
 #define arch_cmpxchg128_local(ptr, o, n)					\
 	__arch_cmpxchg128((ptr), (o), (n), "")
 
-#endif /* CONFIG_64BIT && CONFIG_RISCV_ISA_ZACAS */
+#endif /* CONFIG_64BIT && CONFIG_RISCV_ISA_ZACAS && CONFIG_TOOLCHAIN_HAS_ZACAS */
 
 #ifdef CONFIG_RISCV_ISA_ZAWRS
 /*
diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c
index 14888e5ea19a..348b924bbbca 100644
--- a/arch/riscv/kernel/setup.c
+++ b/arch/riscv/kernel/setup.c
@@ -288,6 +288,7 @@ static void __init riscv_spinlock_init(void)
 
 	if (IS_ENABLED(CONFIG_RISCV_ISA_ZABHA) &&
 	    IS_ENABLED(CONFIG_RISCV_ISA_ZACAS) &&
+	    IS_ENABLED(CONFIG_TOOLCHAIN_HAS_ZACAS) &&
 	    riscv_isa_extension_available(NULL, ZABHA) &&
 	    riscv_isa_extension_available(NULL, ZACAS)) {
 		using_ext = "using Zabha";
-- 
2.34.1