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riscv: Make sure toolchain supports zba before using zba instructions

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Old toolchain like gcc 8.5.0 does not support zba, so we must check that
the toolchain supports this extension before using it in the kernel.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503281836.8pntHm6I-lkp@intel.com/
Link: https://lore.kernel.org/r/20250328115422.253670-1-alexghiti@rivosinc.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
This commit is contained in:
Alexandre Ghiti
2025-03-28 12:54:22 +01:00
parent 3f7023171d
commit 8a2f20ac8e
2 changed files with 11 additions and 2 deletions
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8
arch/riscv/Kconfig
View File

@@ -735,6 +735,14 @@ config TOOLCHAIN_HAS_VECTOR_CRYPTO
def_bool $(as-instr, .option arch$(comma) +v$(comma) +zvkb)
depends on AS_HAS_OPTION_ARCH
config TOOLCHAIN_HAS_ZBA
bool
default y
depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zba)
depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zba)
depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
depends on AS_HAS_OPTION_ARCH
config RISCV_ISA_ZBA
bool "Zba extension support for bit manipulation instructions"
default y

5
arch/riscv/include/asm/runtime-const.h
View File

@@ -77,7 +77,8 @@
".long 1b - .\n\t" \
".popsection" \
#if defined(CONFIG_RISCV_ISA_ZBA) && defined(CONFIG_RISCV_ISA_ZBKB)
#if defined(CONFIG_RISCV_ISA_ZBA) && defined(CONFIG_TOOLCHAIN_HAS_ZBA) \
&& defined(CONFIG_RISCV_ISA_ZBKB)
#define runtime_const_ptr(sym) \
({ \
typeof(sym) __ret, __tmp; \
@@ -93,7 +94,7 @@
: [__ret] "=r" (__ret), [__tmp] "=r" (__tmp)); \
__ret; \
})
#elif defined(CONFIG_RISCV_ISA_ZBA)
#elif defined(CONFIG_RISCV_ISA_ZBA) && defined(CONFIG_TOOLCHAIN_HAS_ZBA)
#define runtime_const_ptr(sym) \
({ \
typeof(sym) __ret, __tmp; \