On Fri, Apr 7, 2023 at 3:27 AM Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> wrote: > > LLVM is not happy with using o32 ABI on 64 bit CPU, thus build 32 bit > kernel is unsupported. > > Detect this in Kconfig to prevent user select 32 bit kernel with > unsupported toolchain. > > Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx> > Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> I suspect this may fix: Link: https://github.com/ClangBuiltLinux/linux/issues/884 > --- > arch/mips/Kconfig | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig > index d896af492da6..5e399a5ac3b3 100644 > --- a/arch/mips/Kconfig > +++ b/arch/mips/Kconfig > @@ -2016,6 +2016,7 @@ choice > config 32BIT > bool "32-bit kernel" > depends on CPU_SUPPORTS_32BIT_KERNEL && SYS_SUPPORTS_32BIT_KERNEL > + depends on CC_HAS_O32_ABI Does this disable 32b mips builds with clang? > select TRAD_SIGNALS > help > Select this option if you want to build a 32-bit kernel. > @@ -3136,7 +3137,7 @@ config COMPAT > > config MIPS32_O32 > bool "Kernel support for o32 binaries" > - depends on 64BIT > + depends on 64BIT && CC_HAS_O32_ABI > select ARCH_WANT_OLD_COMPAT_IPC > select COMPAT > select MIPS32_COMPAT > @@ -3184,6 +3185,10 @@ config CC_HAS_DADDI_WORKAROUNDS > config CC_HAS_BROKEN_INLINE_COMPAT_BRANCH > def_bool y if CC_IS_CLANG > > +config CC_HAS_O32_ABI > + def_bool y > + depends on !CPU_SUPPORTS_64BIT_KERNEL || $(cc-option,-march=mips3 -mabi=32) Should this be def_bool $(cc-option,-march=mips3 -mabi=32) depends on !CPU_SUPPORTS_64BIT_KERNEL ? > + > config AS_HAS_MSA > def_bool $(cc-option,-Wa$(comma)-mmsa) > > -- > 2.39.2 (Apple Git-143) > -- Thanks, ~Nick Desaulniers
