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riscv: Separate toolchain support dependency from RISCV_ISA_ZACAS

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

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20250719091730.2660197-5-pulehui@huaweicloud.com
This commit is contained in:
Pu Lehui 2025-07-19 09:17:24 +00:00 committed by Daniel Borkmann
parent 01422a4f2c
commit ec74ae5662
3 changed files with 5 additions and 3 deletions
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1
arch/riscv/Kconfig
View File

@ -714,7 +714,6 @@ 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

6
arch/riscv/include/asm/cmpxchg.h
View File

@ -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
/*

1
arch/riscv/kernel/setup.c
View File

@ -290,6 +290,7 @@ 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";