Closed
Description
Kernel version is 5.16rc3 and 5.15.5. As arch/s390/Kconfig has the following line, s390 seems somewhat supported by clang:
config COMPAT
def_bool y
prompt "Kernel support for 31 bit emulation"
select ARCH_WANT_OLD_COMPAT_IPC
select COMPAT_OLD_SIGACTION
select HAVE_UID16
depends on MULTIUSER
depends on !CC_IS_CLANG
A config similar to allmodconfig gives the following error at an early stage of build:
LDS arch/s390/kernel/vdso64/vdso64.lds
VDSO64A arch/s390/kernel/vdso64/vdso_user_wrapper.o
VDSO64A arch/s390/kernel/vdso64/note.o
VDSO64C arch/s390/kernel/vdso64/vdso64_generic.o
VDSO64C arch/s390/kernel/vdso64/getcpu.o
LD arch/s390/kernel/vdso64/vdso64.so.dbg
ld.lld: error: unknown argument '-fPIC'
ld.lld: error: unknown emulation: elf64_s390
make[1]: *** [arch/s390/kernel/vdso64/Makefile:50: arch/s390/kernel/vdso64/vdso64.so.dbg] Error 1
make[1]: Target 'include/generated/vdso64-offsets.h' not remade because of errors.
make: *** [arch/s390/Makefile:165: vdso_prepare] Error 2
It can be reproduced by the below script:
#!/bin/sh
KVER=5.16-rc3
LANG=C.UTF-8
export LANG
cd /var/tmp/tmp11s390
cat >/tmp/config$$.txt <<EOF
CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT=n
CONFIG_KASAN=n
CONFIG_GCOV_KERNEL=n
CONFIG_COMPILE_TEST=n
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y
CONFIG_INIT_STACK_ALL_ZERO=y
CONFIG_KVM=y
CONFIG_PREEMPT=y
CONFIG_PREEMPT_DYNAMIC=y
CONFIG_WERROR=n
CONFIG_RUNTIME_TESTING_MENU=n
CONFIG_XFS_FS=n
CONFIG_OVERLAY_FS=n
CONFIG_EMBEDDED=n
CONFIG_ACPI=y
CONFIG_EFI_STUB=y
CONFIG_EFI=y
CONFIG_DMI=y
CONFIG_NUMA=y
CONFIG_MEMORY_HOTPLUG=y
CONFIG_HOTPLUG_PCI=y
CONFIG_HOTPLUG_PCI_PCIE=y
CONFIG_HOTPLUG_CPU=y
CONFIG_MARCH_Z15=y
CONFIG_TUNE_Z15=y
CONFIG_SCHED_TOPOLOGY=y
EOF
for a in s390; do
rm -rf /var/tmp/tmp11s390/$a
mkdir /var/tmp/tmp11s390/$a
cd /var/tmp/tmp11s390/$a
exec </dev/null >build-log-${KVER}-${a}.txt 2>&1
set -xe
tar zxf /var/tmp/linux-${KVER}.tar.gz
cd linux-${KVER}
cp /tmp/config$$.txt .config
make LLVM=1 LLVM_IAS=1 allmodconfig
cat /tmp/config$$.txt >>.config
yes '' |
chrt --idle 0 nice -19 make --keep-going ARCH=$a LLVM=1 LLVM_IAS=1 all &
exec </dev/null >/dev/null 2>&1
done
wait