# git rev-parse -q --verify ee8e0d2751721b7e6faea2b18f9e767bbc9f0d9c^{commit}
ee8e0d2751721b7e6faea2b18f9e767bbc9f0d9c
already have revision, skipping fetch
# git checkout -q -f -B kisskb ee8e0d2751721b7e6faea2b18f9e767bbc9f0d9c
# git clean -qxdf
# git log -1
commit ee8e0d2751721b7e6faea2b18f9e767bbc9f0d9c
Author: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date:   Mon Jul 24 14:26:06 2017 +1000

    powerpc/mm/radix: Workaround prefetch issue with KVM
    
    There's a somewhat architectural issue with Radix MMU and KVM.
    
    When coming out of a guest with AIL (ie, MMU enabled), we start
    executing hypervisor code with the PID register still containing
    whatever the guest has been using.
    
    The problem is that the CPU can (and will) then start prefetching
    or speculatively load from whatever host context has that same
    PID (if any), thus bringing translations for that context into
    the TLB, which Linux doesn't know about.
    
    This can cause stale translations and subsequent crashes.
    
    Fixing this in a way that is neither racy nor a huge performance
    impact is difficult. We could just make the host invalidations
    always use broadcast forms but that would hurt single threaded
    programs for example.
    
    We chose to fix it instead by partitioning the PID space between
    guest and host. This is possible because today Linux only use 19
    out of the 20 bits of PID space, so existing guests will work
    if we make the host use the top half of the 20 bits space.
    
    We additionally add a property to indicate to Linux the size of
    the PID register which will be useful if we eventually have
    processors with a larger PID space available.
    
    There is still an issue with malicious guests purposefully setting
    the PID register to a value in the host range. Hopefully future HW
    can prevent that, but in the meantime, we handle it with a pair of
    kludges:
    
     - On the way out of a guest, before we clear the current VCPU
    in the PACA, we check the PID and if it's outside of the permitted
    range we flush the TLB for that PID.
    
     - When context switching, if the mm is "new" on that CPU (the
    corresponding bit was set for the first time in the mm cpumask), we
    check if any sibling thread is in KVM (has a non-NULL VCPU pointer
    in the PACA). If that is the case, we also flush the PID for that
    CPU (core).
    
    This second part is needed to handle the case where a process is
    migrated (or starts a new pthread) on a sibling thread of the CPU
    coming out of KVM, as there's a window where stale translations
    can exist before we detect it and flush them out.
    
    A future optimization could be added by keeping track of whether
    the PID has ever been used and avoid doing that for completely
    fresh PIDs. We could similarily mark PIDs that have been the subject of
    a global invalidation as "fresh". But for now this will do.
    
    Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 ee8e0d2751721b7e6faea2b18f9e767bbc9f0d9c
# < make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  randconfig
KCONFIG_SEED=0xA18E4ADE
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_BUILD_DOCSRC=n
# Added to kconfig CONFIG_MODULE_SIG=n
# Added to kconfig CONFIG_CPU_BIG_ENDIAN=y
# Added to kconfig CONFIG_PPC64=y
# Added to kconfig CONFIG_PPC_DISABLE_WERROR=y
# Added to kconfig CONFIG_SECTION_MISMATCH_WARN_ONLY=y
# Added to kconfig CONFIG_PREVENT_FIRMWARE_BUILD=y
# Added to kconfig CONFIG_CC_STACKPROTECTOR_STRONG=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_LD_HEAD_STUB_CATCH=y
# Added to kconfig 
# yes \n | make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
make[1]: Entering directory '/home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3'
  GEN     ./Makefile
scripts/kconfig/conf  --silentoldconfig Kconfig
  CHK     include/config/kernel.release
  GEN     ./Makefile
  WRAP    arch/powerpc/include/generated/asm/clkdev.h
  WRAP    arch/powerpc/include/generated/asm/div64.h
  WRAP    arch/powerpc/include/generated/asm/export.h
  WRAP    arch/powerpc/include/generated/asm/irq_regs.h
  WRAP    arch/powerpc/include/generated/asm/irq_work.h
  WRAP    arch/powerpc/include/generated/asm/local64.h
  WRAP    arch/powerpc/include/generated/asm/mcs_spinlock.h
  WRAP    arch/powerpc/include/generated/asm/preempt.h
  WRAP    arch/powerpc/include/generated/asm/rwsem.h
  WRAP    arch/powerpc/include/generated/asm/vtime.h
  CHK     include/generated/uapi/linux/version.h
  UPD     include/generated/uapi/linux/version.h
  WRAP    arch/powerpc/include/generated/uapi/asm/param.h
  WRAP    arch/powerpc/include/generated/uapi/asm/poll.h
  WRAP    arch/powerpc/include/generated/uapi/asm/resource.h
  WRAP    arch/powerpc/include/generated/uapi/asm/sockios.h
  WRAP    arch/powerpc/include/generated/uapi/asm/statfs.h
  HOSTCC  scripts/basic/bin2c
  UPD     include/config/kernel.release
  Using /home/kisskb/slave/src as source for kernel
  CHK     include/generated/utsrelease.h
  UPD     include/generated/utsrelease.h
  HOSTCC  scripts/kallsyms
  HOSTCC  scripts/dtc/dtc.o
  HOSTCC  scripts/pnmtologo
  CC      scripts/mod/empty.o
  HOSTCC  scripts/mod/mk_elfconfig
  CC      scripts/mod/devicetable-offsets.s
  HOSTCC  scripts/dtc/flattree.o
  CHK     scripts/mod/devicetable-offsets.h
  UPD     scripts/mod/devicetable-offsets.h
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  HOSTCC  scripts/conmakehash
  HOSTCC  scripts/dtc/fstree.o
  HOSTCC  scripts/sortextable
  HOSTCC  scripts/dtc/data.o
  HOSTCC  scripts/dtc/livetree.o
  HOSTCC  scripts/dtc/treesource.o
  HOSTCC  scripts/mod/file2alias.o
  HOSTCC  scripts/mod/sumversion.o
  HOSTCC  scripts/extract-cert
  HOSTCC  scripts/insert-sys-cert
  HOSTCC  scripts/asn1_compiler
  HOSTCC  scripts/dtc/srcpos.o
  HOSTCC  scripts/dtc/checks.o
  HOSTCC  scripts/dtc/util.o
  SHIPPED scripts/dtc/dtc-lexer.lex.c
  SHIPPED scripts/dtc/dtc-parser.tab.h
  SHIPPED scripts/dtc/dtc-parser.tab.c
  HOSTCC  scripts/dtc/dtc-lexer.lex.o
  HOSTCC  scripts/dtc/dtc-parser.tab.o
  CHK     include/generated/timeconst.h
  CC      kernel/bounds.s
  UPD     include/generated/timeconst.h
  CHK     include/generated/bounds.h
  UPD     include/generated/bounds.h
  CC      arch/powerpc/kernel/asm-offsets.s
  HOSTLD  scripts/dtc/dtc
  HOSTLD  scripts/mod/modpost
  CHK     include/generated/asm-offsets.h
  UPD     include/generated/asm-offsets.h
  CALL    /home/kisskb/slave/src/scripts/checksyscalls.sh
  CC      init/main.o
  CHK     include/generated/compile.h
  AR      usr/built-in.o
  CC      init/do_mounts.o
  CC      init/noinitramfs.o
  CC      init/init_task.o
  UPD     include/generated/compile.h
  CC      init/version.o
  CC      arch/powerpc/mm/fault.o
  AS      arch/powerpc/lib/string.o
  CC      arch/powerpc/sysdev/mpic.o
  CC      arch/powerpc/platforms/85xx/smp.o
  CC      arch/powerpc/lib/alloc.o
  CC      arch/powerpc/kernel/cputable.o
  CC      arch/powerpc/kernel/ptrace.o
  CC      arch/powerpc/lib/code-patching.o
  CC      arch/powerpc/lib/feature-fixups.o
  AS      arch/powerpc/lib/checksum_64.o
  CC      arch/powerpc/lib/checksum_wrappers.o
  CC      arch/powerpc/kernel/syscalls.o
  CC      arch/powerpc/mm/mem.o
  CC      arch/powerpc/platforms/85xx/common.o
  CC      arch/powerpc/sysdev/mpic_msi.o
  CC      arch/powerpc/sysdev/mpic_u3msi.o
  CC      arch/powerpc/mm/pgtable.o
  CC      arch/powerpc/lib/sstep.o
  AR      arch/powerpc/platforms/85xx/built-in.o
  AR      arch/powerpc/platforms/built-in.o
  AR      init/mounts.o
  AR      init/built-in.o
  AS      arch/powerpc/lib/ldstfp.o
  AS      arch/powerpc/lib/copypage_64.o
  CC      arch/powerpc/kernel/irq.o
  CC      arch/powerpc/mm/mmap.o
  AR      arch/powerpc/math-emu/built-in.o
  CC      arch/powerpc/sysdev/msi_bitmap.o
  CC      arch/powerpc/kernel/align.o
  CC      arch/powerpc/mm/init_64.o
  AR      arch/powerpc/crypto/built-in.o
  AS [M]  arch/powerpc/crypto/md5-asm.o
  CC [M]  arch/powerpc/crypto/md5-glue.o
  AR      arch/powerpc/net/built-in.o
  CC      arch/powerpc/kernel/signal_32.o
  CC      arch/powerpc/kernel/pmc.o
  CC      arch/powerpc/kernel/vdso.o
  CC      arch/powerpc/sysdev/fsl_soc.o
  CC      arch/powerpc/sysdev/fsl_mpic_err.o
  CC      arch/powerpc/sysdev/fsl_pci.o
  CC      arch/powerpc/mm/pgtable_64.o
  AS      arch/powerpc/purgatory/trampoline.o
  CC      arch/powerpc/kernel/process.o
  LD      arch/powerpc/purgatory/purgatory.ro
  LD [M]  arch/powerpc/crypto/md5-ppc.o
  BIN2C   arch/powerpc/purgatory/kexec-purgatory.c
  CC      arch/powerpc/mm/init-common.o
  CC      arch/powerpc/purgatory/kexec-purgatory.o
  AR      arch/powerpc/purgatory/built-in.o
  CPP     arch/powerpc/kernel/systbl_chk.i
  CC      arch/powerpc/sysdev/fsl_msi.o
  CC      kernel/fork.o
  CC      certs/system_keyring.o
  AS      arch/powerpc/lib/copyuser_64.o
  CC      kernel/exec_domain.o
  AS      arch/powerpc/lib/mem_64.o
  CC      arch/powerpc/kernel/idle.o
  AS      arch/powerpc/lib/hweight_64.o
  CC      mm/filemap.o
  AS      arch/powerpc/lib/copyuser_power7.o
  AS      arch/powerpc/lib/string_64.o
In file included from /home/kisskb/slave/src/include/linux/mm.h:9:0,
                 from /home/kisskb/slave/src/include/linux/mman.h:4,
                 from /home/kisskb/slave/src/arch/powerpc/mm/pgtable_64.c:31:
/home/kisskb/slave/src/arch/powerpc/mm/pgtable_64.c: In function '__alloc_for_cache':
/home/kisskb/slave/src/arch/powerpc/mm/pgtable_64.c:358:21: error: 'PGALLOC_GFP' undeclared (first use in this function)
   page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
                     ^
/home/kisskb/slave/src/include/linux/gfp.h:492:42: note: in definition of macro 'alloc_page'
 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
                                          ^
/home/kisskb/slave/src/arch/powerpc/mm/pgtable_64.c:358:21: note: each undeclared identifier is reported only once for each function it appears in
   page = alloc_page(PGALLOC_GFP | __GFP_ACCOUNT);
                     ^
/home/kisskb/slave/src/include/linux/gfp.h:492:42: note: in definition of macro 'alloc_page'
 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
                                          ^
  AS      arch/powerpc/lib/copypage_power7.o
/home/kisskb/slave/src/scripts/Makefile.build:302: recipe for target 'arch/powerpc/mm/pgtable_64.o' failed
make[2]: *** [arch/powerpc/mm/pgtable_64.o] Error 1
/home/kisskb/slave/src/Makefile:1008: recipe for target 'arch/powerpc/mm' failed
make[1]: *** [arch/powerpc/mm] Error 2
make[1]: *** Waiting for unfinished jobs....
  EXTRACT_CERTS   
  CC      mm/mempool.o
  AS      arch/powerpc/lib/memcpy_power7.o
  AS      arch/powerpc/lib/memcpy_64.o
  AS      certs/system_certificates.o
  AR      certs/built-in.o
  AS      arch/powerpc/lib/memcmp_64.o
  CC      arch/powerpc/lib/locks.o
  CC      mm/oom_kill.o
  CC      mm/maccess.o
  AR      arch/powerpc/lib/built-in.o
  CC      mm/page_alloc.o
  CC      kernel/panic.o
  CC      arch/powerpc/sysdev/indirect_pci.o
  CC      kernel/cpu.o
  CC      arch/powerpc/kernel/signal.o
  CC      arch/powerpc/kernel/sysfs.o
  CC      arch/powerpc/kernel/cacheinfo.o
  CC [M]  arch/powerpc/sysdev/rtc_cmos_setup.o
  CC      arch/powerpc/kernel/time.o
  AR      arch/powerpc/sysdev/built-in.o
  CC      arch/powerpc/kernel/prom.o
  CC      arch/powerpc/kernel/traps.o
  CC      mm/page-writeback.o
  CC      mm/readahead.o
  CC      mm/swap.o
  CC      kernel/exit.o
  CC      kernel/softirq.o
  CC      arch/powerpc/kernel/setup-common.o
  CC      arch/powerpc/kernel/udbg.o
  CC      mm/truncate.o
  AS      arch/powerpc/kernel/misc.o
  CC      arch/powerpc/kernel/io.o
  CC      mm/vmscan.o
  CC      arch/powerpc/kernel/dma.o
  CC      mm/shmem.o
  AS      arch/powerpc/kernel/misc_64.o
  CC      mm/util.o
  CC      arch/powerpc/kernel/of_platform.o
  CC      arch/powerpc/kernel/prom_parse.o
  CC      kernel/resource.o
  CC      mm/mmzone.o
  CC      mm/vmstat.o
  CC      mm/backing-dev.o
  CC      kernel/sysctl.o
  CC      kernel/sysctl_binary.o
  CC      mm/mm_init.o
  CC      arch/powerpc/kernel/setup_64.o
  CC      mm/mmu_context.o
  CC      kernel/capability.o
  CC      mm/percpu.o
  CC      arch/powerpc/kernel/sys_ppc32.o
  CC      arch/powerpc/kernel/signal_64.o
  CC      arch/powerpc/kernel/ptrace32.o
  CC      arch/powerpc/kernel/paca.o
  CC      arch/powerpc/kernel/nvram_64.o
  CC      arch/powerpc/kernel/firmware.o
  CC      kernel/ptrace.o
  CC      mm/slab_common.o
  CC      mm/compaction.o
  CC      mm/vmacache.o
  AR      arch/powerpc/kernel/trace/built-in.o
  CC      mm/swap_slots.o
  CC      mm/interval_tree.o
  LDS     arch/powerpc/kernel/vdso32/vdso32.lds
  VDSO32A arch/powerpc/kernel/vdso32/sigtramp.o
  VDSO32A arch/powerpc/kernel/vdso32/gettimeofday.o
  CC      kernel/user.o
  VDSO32A arch/powerpc/kernel/vdso32/datapage.o
  VDSO32A arch/powerpc/kernel/vdso32/cacheflush.o
  VDSO32A arch/powerpc/kernel/vdso32/note.o
  VDSO32A arch/powerpc/kernel/vdso32/getcpu.o
  CC      kernel/signal.o
  VDSO32L arch/powerpc/kernel/vdso32/vdso32.so.dbg
  OBJCOPY arch/powerpc/kernel/vdso32/vdso32.so
  AS      arch/powerpc/kernel/vdso32/vdso32_wrapper.o
  AR      arch/powerpc/kernel/vdso32/built-in.o
  CC      kernel/sys.o
  AS      arch/powerpc/kernel/exceptions-64e.o
  LDS     arch/powerpc/kernel/vdso64/vdso64.lds
  AS      arch/powerpc/kernel/vdso64/sigtramp.o
  AS      arch/powerpc/kernel/vdso64/gettimeofday.o
  AS      arch/powerpc/kernel/vdso64/datapage.o
  CC      kernel/kmod.o
  CC      kernel/workqueue.o
  AS      arch/powerpc/kernel/vdso64/cacheflush.o
  CC      kernel/pid.o
  CC      mm/list_lru.o
  AS      arch/powerpc/kernel/vdso64/note.o
  AS      arch/powerpc/kernel/vdso64/getcpu.o
  VDSO64L arch/powerpc/kernel/vdso64/vdso64.so.dbg
  OBJCOPY arch/powerpc/kernel/vdso64/vdso64.so
  AS      arch/powerpc/kernel/vdso64/vdso64_wrapper.o
  CC      mm/workingset.o
  CC      kernel/task_work.o
  AR      arch/powerpc/kernel/vdso64/built-in.o
  AS      arch/powerpc/kernel/idle_book3e.o
  CC      arch/powerpc/kernel/crash_dump.o
  CC      arch/powerpc/kernel/module.o
  CC      arch/powerpc/kernel/module_64.o
  CC      kernel/extable.o
  CC      arch/powerpc/kernel/dbell.o
  AS      arch/powerpc/kernel/reloc_64.o
  CC      mm/debug.o
  CC      kernel/params.o
  CC      mm/gup.o
  CC      mm/highmem.o
  CC      arch/powerpc/kernel/dma-iommu.o
  CC      arch/powerpc/kernel/iommu.o
  CC      mm/memory.o
  CC      mm/mincore.o
  CC      mm/mlock.o
  CC      kernel/kthread.o
  CC      arch/powerpc/kernel/kgdb.o
  CC      mm/mmap.o
  CC      kernel/sys_ni.o
  CC      kernel/nsproxy.o
  CC      kernel/notifier.o
  CC      kernel/ksysfs.o
  CC      arch/powerpc/kernel/smp.o
  CC      mm/mprotect.o
  CC      mm/mremap.o
  CC      arch/powerpc/kernel/kprobes.o
  CC      kernel/cred.o
  CC      arch/powerpc/kernel/legacy_serial.o
  CC      arch/powerpc/kernel/udbg_16550.o
  CC      arch/powerpc/kernel/stacktrace.o
  CC      arch/powerpc/kernel/pci_64.o
  CC      kernel/reboot.o
  CC      kernel/async.o
  CC      kernel/range.o
  CC      mm/msync.o
  CC      arch/powerpc/kernel/pci_dn.o
  CC      mm/page_vma_mapped.o
  CC      arch/powerpc/kernel/pci-hotplug.o
  CC      mm/pagewalk.o
  CC      arch/powerpc/kernel/isa-bridge.o
  CC      kernel/smpboot.o
  CC      kernel/ucount.o
  CC      kernel/groups.o
  CC      kernel/bpf/core.o
  CC      kernel/cgroup/cgroup.o
  CC      mm/pgtable-generic.o
  CC      kernel/debug/debug_core.o
  CC      kernel/irq/irqdesc.o
  CC      kernel/cgroup/namespace.o
  CC      kernel/cgroup/cgroup-v1.o
  CC      arch/powerpc/kernel/pci-common.o
  CC      arch/powerpc/kernel/pci_of_scan.o
  CC      arch/powerpc/kernel/msi.o
  CC      arch/powerpc/kernel/machine_kexec.o
  CC      mm/rmap.o
  CC      kernel/irq/handle.o
  CC      kernel/debug/gdbstub.o
  CC      arch/powerpc/kernel/crash.o
  CC      kernel/cgroup/cpuset.o
  CC      kernel/irq/manage.o
  CC      mm/vmalloc.o
  CC      mm/init-mm.o
  CC      kernel/bpf/syscall.o
  CC      kernel/bpf/verifier.o
  CC      kernel/irq/spurious.o
  CC      arch/powerpc/kernel/machine_kexec_64.o
  CC      arch/powerpc/kernel/machine_kexec_file_64.o
  CC      mm/nobootmem.o
  AR      kernel/debug/built-in.o
  CC      mm/memblock.o
  CC      kernel/irq/resend.o
  CC      kernel/irq/chip.o
  CC      arch/powerpc/kernel/kexec_elf_64.o
  CC      arch/powerpc/kernel/iomap.o
  AS      arch/powerpc/kernel/ppc_save_regs.o
  CC      kernel/bpf/inode.o
  CC      mm/page_io.o
  CC      mm/swap_state.o
  AR      kernel/livepatch/built-in.o
  CC      kernel/cgroup/debug.o
  CC      mm/swapfile.o
  CC      kernel/irq/dummychip.o
  CC      mm/frontswap.o
  CC      arch/powerpc/kernel/epapr_paravirt.o
  CC      kernel/irq/devres.o
  CC      kernel/irq/generic-chip.o
  AR      kernel/cgroup/built-in.o
  CC      kernel/irq/irqdomain.o
  CC      kernel/irq/cpuhotplug.o
  CC      kernel/locking/mutex.o
  CC      kernel/locking/semaphore.o
  AS      arch/powerpc/kernel/epapr_hcalls.o
  CC      arch/powerpc/kernel/prom_init.o
  CC      kernel/locking/rwsem.o
  CC      kernel/bpf/helpers.o
  CC      kernel/bpf/hashtab.o
  AS      arch/powerpc/kernel/head_64.o
  CC      kernel/bpf/arraymap.o
  CC      kernel/bpf/percpu_freelist.o
  CC      kernel/bpf/bpf_lru_list.o
  CC      kernel/bpf/lpm_trie.o
  CC      kernel/bpf/map_in_map.o
  CC      kernel/irq/msi.o
  CC      kernel/bpf/cgroup.o
  CC      kernel/locking/percpu-rwsem.o
  CC      kernel/locking/mutex-debug.o
  CC      kernel/locking/lockdep.o
  CC      kernel/irq/affinity.o
  CC      kernel/locking/spinlock.o
  CC      kernel/locking/osq_lock.o
  LDS     arch/powerpc/kernel/vmlinux.lds
  CC      kernel/power/qos.o
  AS      arch/powerpc/kernel/fpu.o
  AS      arch/powerpc/kernel/entry_64.o
  CALL    /home/kisskb/slave/src/arch/powerpc/kernel/systbl_chk.sh
  CALL    /home/kisskb/slave/src/arch/powerpc/kernel/prom_init_check.sh
  CC      mm/dmapool.o
  CC      mm/mempolicy.o
  AS      arch/powerpc/kernel/systbl.o
  AR      kernel/irq/built-in.o
  CC      mm/sparse.o
  AR      arch/powerpc/kernel/built-in.o
  CC      mm/mmu_notifier.o
  CC      mm/page_poison.o
  CC      mm/slab.o
  CC      mm/memtest.o
  AR      kernel/bpf/built-in.o
  CC      kernel/locking/rtmutex.o
  CC      mm/migrate.o
  CC      kernel/locking/rtmutex-debug.o
  CC      kernel/power/poweroff.o
  CC      kernel/locking/spinlock_debug.o
  CC      kernel/printk/printk.o
  CC      mm/page_counter.o
  AR      kernel/power/built-in.o
  CC      kernel/locking/rwsem-xadd.o
  CC      kernel/rcu/update.o
  CC      kernel/rcu/sync.o
  CC      mm/memcontrol.o
  CC      kernel/rcu/srcutree.o
  CC [M]  kernel/locking/test-ww_mutex.o
  CC      kernel/sched/core.o
  CC      kernel/rcu/rcuperf.o
  AR      kernel/printk/built-in.o
  CC      kernel/rcu/tree.o
  CC      kernel/rcu/rcu_segcblist.o
  CC      kernel/sched/loadavg.o
  CC      kernel/sched/clock.o
  AR      kernel/locking/built-in.o
  CC      kernel/sched/cputime.o
  CC [M]  kernel/rcu/rcutorture.o
  CC      mm/vmpressure.o
  CC      kernel/time/time.o
  CC      kernel/trace/trace_clock.o
  CC      kernel/kcmp.o
  CC      kernel/stacktrace.o
  CC      kernel/sched/idle_task.o
  AR      kernel/trace/built-in.o
  CC      kernel/sched/fair.o
  CC      kernel/sched/rt.o
  CC      kernel/time/timer.o
  CC      kernel/sched/deadline.o
  CC      mm/swap_cgroup.o
  CC      kernel/futex.o
  CC      kernel/futex_compat.o
  CC      kernel/time/hrtimer.o
  CC      kernel/time/timekeeping.o
  CC      kernel/time/ntp.o
  CC      kernel/time/clocksource.o
  AR      kernel/rcu/built-in.o
  CC      kernel/dma.o
  CC      mm/page_owner.o
  CC      kernel/time/jiffies.o
  CC      kernel/time/timer_list.o
  CC      kernel/time/timeconv.o
  CC      kernel/sched/wait.o
  CC      kernel/time/timecounter.o
  CC      mm/cleancache.o
  CC      kernel/time/alarmtimer.o
  CC      mm/page_isolation.o
  CC      mm/zpool.o
  CC      mm/zbud.o
  CC      mm/zsmalloc.o
  CC      kernel/sched/wait_bit.o
  CC      kernel/sched/swait.o
  CC      kernel/smp.o
  CC      kernel/module.o
  CC      kernel/time/posix-stubs.o
  CC      kernel/time/clockevents.o
  CC      kernel/sched/completion.o
  CC      kernel/kallsyms.o
  CC      kernel/crash_core.o
  CC      kernel/kexec_core.o
  CC      kernel/kexec_file.o
  CC      kernel/sched/idle.o
  CC      kernel/time/tick-common.o
  CC      kernel/sched/cpupri.o
  CC      kernel/sched/cpudeadline.o
  CC      kernel/time/tick-broadcast.o
  CC      kernel/backtracetest.o
  CC      kernel/compat.o
  CC      kernel/utsname.o
  CC      mm/cma.o
  CC      kernel/sched/topology.o
  CC      mm/page_ext.o
  CC      mm/cma_debug.o
  CC      kernel/sched/stop_task.o
  CC      mm/userfaultfd.o
  CC      kernel/time/tick-broadcast-hrtimer.o
  CC      kernel/time/tick-oneshot.o
  CC      kernel/time/tick-sched.o
  CC      kernel/time/timekeeping_debug.o
  CC [M]  kernel/time/test_udelay.o
  CC      kernel/user_namespace.o
  CC      kernel/sched/autogroup.o
  CC      kernel/sched/cpufreq.o
  CC      kernel/pid_namespace.o
  CC      kernel/stop_machine.o
  AR      mm/built-in.o
  CC      kernel/kprobes.o
  CC      kernel/elfcore.o
  CC      kernel/irq_work.o
  CC      kernel/padata.o
  CC      kernel/crash_dump.o
  CC      kernel/context_tracking.o
  CC      kernel/torture.o
  AR      kernel/sched/built-in.o
  CC      kernel/membarrier.o
  CC      kernel/memremap.o
  AR      kernel/time/built-in.o
  AR      kernel/built-in.o
make[1]: Leaving directory '/home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3'
Makefile:145: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
Command 'make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /home/kisskb/slave/build/powerpc-fixes_powerpc-randconfig_powerpc-5.3
# Build took: 0:00:30.726282