This series disables CONFIG_X86_X32_ABI=y with llvm-objcopy, which has had two outstanding issues, which are further outlined in the second patch:
https://github.com/ClangBuiltLinux/linux/issues/514 https://github.com/ClangBuiltLinux/linux/issues/1141
The first patch is from Masahiro, which moves the CONFIG_X86_X32_ABI back into Kconfig proper. It was initially pushed as an RFC:
https://lore.kernel.org/r/20210227183910.221873-1-masahiroy@kernel.org/
The conclusion of that thread was that the check was still needed because of the two issues above. However, with the introduction of IBT, specifically commit 41c5ef31ad71 ("x86/ibt: Base IBT bits"), the second issue linked above becomes visible with allmodconfig, which heavily impacts automated testing.
The second patch builds on the first by just universally disabling CONFIG_X86_X32_ABI when using llvm-objcopy at configuration time so that neither issue is visible.
While it is unlikely that these issues will be fixed in LLVM, this could eventually become a version check.
This is based on -tip x86/core and I would like for both patches to go with the IBT changes so that there is no build breakage.
Masahiro Yamada (1): x86: Remove toolchain check for X32 ABI capability
Nathan Chancellor (1): x86/Kconfig: Do not allow CONFIG_X86_X32_ABI=y with llvm-objcopy
arch/x86/Kconfig | 13 +++++++------ arch/x86/Makefile | 16 ---------------- arch/x86/entry/syscalls/Makefile | 2 +- arch/x86/include/asm/syscall_wrapper.h | 6 +++--- arch/x86/include/asm/vdso.h | 2 +- arch/x86/kernel/process_64.c | 2 +- fs/fuse/ioctl.c | 2 +- fs/xfs/xfs_ioctl32.c | 2 +- sound/core/control_compat.c | 16 ++++++++-------- sound/core/pcm_compat.c | 20 ++++++++++---------- 10 files changed, 33 insertions(+), 48 deletions(-)
base-commit: f8afc9d88e65d189653f363eacc1f3131216ef7c