Conor Dooley aae538cd03 riscv: fix detection of toolchain Zihintpause support ... It is not sufficient to check if a toolchain supports a particular extension without checking if the linker supports that extension too. For example, Clang 15 supports Zihintpause but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zihintpause' Add a TOOLCHAIN_HAS_ZIHINTPAUSE which checks if each of the compiler, assembler and linker support the extension. Replace the ifdef in the vdso with one depending on this new symbol. Fixes: 8eb060e101 ("arch/riscv: add Zihintpause support") Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20221006173520.1785507-3-conor@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2022-10-27 15:13:06 -07:00
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clocksource.h	riscv: use vDSO common flow to reduce the latency of the time-related functions	2020-06-10 19:47:16 -07:00
gettimeofday.h	riscv/vdso: Add support for time namespaces	2021-10-04 14:16:43 -07:00
processor.h	riscv: fix detection of toolchain Zihintpause support	2022-10-27 15:13:06 -07:00
vsyscall.h	riscv: use vDSO common flow to reduce the latency of the time-related functions	2020-06-10 19:47:16 -07:00