util/cpuinfo-riscv: Use linux __riscv_hwprobe syscall
With recent linux kernels, there is a syscall to probe for various
ISA extensions. These bits were phased in over several kernel
releases, so we still require checks for symbol availability.
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/meson.build b/meson.build
index 54e6b09..2f981f9 100644
--- a/meson.build
+++ b/meson.build
@@ -2862,6 +2862,12 @@
}''')
config_host_data.set('CONFIG_CPUID_H', have_cpuid_h)
+# Don't bother to advertise asm/hwprobe.h for old versions that do
+# not contain RISCV_HWPROBE_EXT_ZBA.
+config_host_data.set('CONFIG_ASM_HWPROBE_H',
+ cc.has_header_symbol('asm/hwprobe.h',
+ 'RISCV_HWPROBE_EXT_ZBA'))
+
config_host_data.set('CONFIG_AVX2_OPT', get_option('avx2') \
.require(have_cpuid_h, error_message: 'cpuid.h not available, cannot enable AVX2') \
.require(cc.links('''
