Invalid or unknown z ISA extension: 'zicbom' #1714

nickdesaulniers · 2022-09-21T16:40:15Z

@khilman reports that using BFD for riscv is failing with the error:

riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom'

example: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log

The text was updated successfully, but these errors were encountered:

nathanchance · 2022-09-21T18:59:36Z

Isn't this on ld.bfd to support? Should we open an issue for it upstream? cc @palmer-dabbelt

nickdesaulniers · 2022-09-21T20:24:56Z

binutils-gdb commit 41d6ac5da655 ("RISC-V: Cache management instructions")
added support for Zicbom back in March 18.
Looking at the releases, it looks like that should have shipped in only the latest 2.39 release. KernelCI might be using an older release of GNU binutils. @khilman can you verify what version of riscv-linux-gnu-binutils KernelCI is using?

khilman · 2022-09-21T20:34:43Z

Looks like it's 2.35.2, which is the version of binutils-riscv64-linux-gnu that comes with debian bullseye, which is the baseline of our Docker images.

$ docker run -it kernelci/clang-16:kselftest-kernelci bash
kernelci@8f5aebbc8d3f:~$ riscv64-linux-gnu-ld --version
GNU ld (GNU Binutils for Debian) 2.35.2
Copyright (C) 2020 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
kernelci@8f5aebbc8d3f:~$ clang --version
Debian clang version 16.0.0-++20220919071801+818b1ab84e7b-1~exp1~20220919071900.393
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-16/bin
kernelci@8f5aebbc8d3f:~$

ConchuOD · 2022-09-21T20:40:14Z

Sounds about right. @nathanchance if you're thinking about combos to put into Palmer's pre-commit CI then prob some sort of llvm/binutils combo seem like a good idea.

nathanchance · 2022-09-22T03:41:45Z

Sounds about right. @nathanchance if you're thinking about combos to put into Palmer's pre-commit CI then prob some sort of llvm/binutils combo seem like a good idea.

Yup, I agree! I am not sure that it would have really saved us here though, as we will likely be using the latest stable version of binutils so we would have support for zicbom. I am not sure how Palmer has the versioning set up yet though, I'll be studying it soon.

ConchuOD · 2022-09-22T07:05:31Z

Sounds about right. @nathanchance if you're thinking about combos to put into Palmer's pre-commit CI then prob some sort of llvm/binutils combo seem like a good idea.

Yup, I agree! I am not sure that it would have really saved us here though, as we will likely be using the latest stable version of binutils so we would have support for zicbom. I am not sure how Palmer has the versioning set up yet though, I'll be studying it soon.

Yeah, less about this specific issue and more about me suspecting that neither developers nor reviewers are using a mixed setup.

khilman · 2022-09-22T14:28:58Z

For KernelCI, I'm now removing the mixed setu. Seems like it was added as a workaround, but was then forgotten.

ConchuOD · 2022-09-24T15:15:22Z

FYI this is not an interop bug, it's broken for gcc 12 + binutils w/o zicbom too.

ConchuOD · 2022-09-26T21:15:25Z

Isn't this on ld.bfd to support? Should we open an issue for it upstream? cc @palmer-dabbelt

I had another bit of a look at this tonight, LD_VERSION >= 2.39 (LLD_VERSION would be 15) is required - but gating the Zicbom symbols based on that doesn't stop the string being emitted into the object file, so not sure how one is meant to handle that.

palmer-dabbelt · 2022-10-04T19:57:35Z

oops, I guess we need to check -Wa,-march=...zicbom... rather than just -mach=...zicbom..., because that's what we need to make inline assembly work. Does someone have a patch?

ConchuOD · 2022-10-04T19:59:11Z

if it's that straightforward, I guess I can have one...

ConchuOD · 2022-10-04T20:21:09Z

Seemingly not that straightforward. That does do dynamic disabling of CONFIG_...ZICBOM but it does not stop zicbom being emitted into the object files.

ConchuOD · 2022-10-04T20:40:49Z

Seemingly not that straightforward. That does do dynamic disabling of CONFIG_...ZICBOM but it does not stop zicbom being emitted into the object files.

Palmer pointed out I missed a cc-option check in the Makefile too... That sorts it so I will in fact send a aptch...

It is not sufficient to check if a toolchain supports a particular extension without checking if the linker, assembler etc support that extension too. For example, Clang 15 supports Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if each of the compiler, assembler and linker support Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 6df2a01 ("riscv: fix build with binutils 2.38") Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") Fixes: 8eb060e ("arch/riscv: add Zihintpause support") Signed-off-by: Conor Dooley <conor.dooley@microchip.com> --- The other extensions with toolchain impact need this too, certainly Zihintpause does & possibly Zicsr/Zifencei?

It is not sufficient to check if a toolchain supports a particular extension without checking if the linker, assembler etc support that extension too. For example, Clang 15 supports Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if each of the compiler, assembler and linker support Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") Signed-off-by: Conor Dooley <conor.dooley@microchip.com> --- The other extensions with toolchain impact need this too, certainly Zihintpause does & possibly Zicsr/Zifencei?

ConchuOD · 2022-10-06T17:39:49Z

Ignore those commits, I had a duplicate as-option check in them - but I submitted some patches that seem to work..

I've probably done something awful since tc stuff is pushing my comfort zone, but:
https://lore.kernel.org/linux-riscv/20221006173520.1785507-1-conor@kernel.org

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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

ConchuOD · 2022-10-27T23:55:30Z

https://git.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git/commit/?h=fixes&id=952b64d6665c8b6fdd13ba63be7adc3be51641d7

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

nathanchance · 2022-11-01T20:34:01Z

https://git.kernel.org/linus/952b64d6665c8b6fdd13ba63be7adc3be51641d7

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

[ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org>

BugLink: https://bugs.launchpad.net/bugs/1996084 [ Upstream commit b8c8687 ] 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 Zicbom but GNU bintutils 2.35.2 does not, leading build errors like so: riscv64-linux-gnu-ld: -march=rv64i2p0_m2p0_a2p0_c2p0_zicbom1p0_zihintpause2p0: Invalid or unknown z ISA extension: 'zicbom' Convert CC_HAS_ZICBOM to TOOLCHAIN_HAS_ZICBOM & check if the linker also supports Zicbom. Reported-by: Kevin Hilman <khilman@baylibre.com> Link: ClangBuiltLinux/linux#1714 Link: https://storage.kernelci.org/next/master/next-20220920/riscv/defconfig+CONFIG_EFI=n/clang-16/logs/kernel.log Fixes: 1631ba1 ("riscv: Add support for non-coherent devices using zicbom extension") 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/20221006173520.1785507-2-conor@kernel.org [Palmer: Check for ld-2.38, not 2.39, as 2.38 no longer errors.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>

nickdesaulniers added [ARCH] risc-v This bug impacts ARCH=riscv [Reported-by] KernelCI Reported-by: kernelci.org bot <bot@kernelci.org> GNU Binutils Interop non-LLVM=1 usage labels Sep 21, 2022

nickdesaulniers assigned ConchuOD Oct 6, 2022

nickdesaulniers added [PATCH] Submitted A patch has been submitted for review [BUG] linux A bug that should be fixed in the mainline kernel. labels Oct 6, 2022

nathanchance added [PATCH] Accepted A submitted patch has been accepted upstream and removed [PATCH] Submitted A patch has been submitted for review labels Oct 28, 2022

nathanchance closed this as completed Nov 1, 2022

nathanchance added [FIXED][LINUX] 6.1 This bug was fixed in Linux 6.1 and removed [PATCH] Accepted A submitted patch has been accepted upstream labels Nov 1, 2022

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Invalid or unknown z ISA extension: 'zicbom' #1714

Invalid or unknown z ISA extension: 'zicbom' #1714

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Invalid or unknown z ISA extension: 'zicbom' #1714

Invalid or unknown z ISA extension: 'zicbom' #1714

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