# git rev-parse -q --verify 91a62bac46aaa40d6fc94fb95f01119ea9a561c2^{commit}
91a62bac46aaa40d6fc94fb95f01119ea9a561c2
already have revision, skipping fetch
# git checkout -q -f -B kisskb 91a62bac46aaa40d6fc94fb95f01119ea9a561c2
# git clean -qxdf
# git log -1
commit 91a62bac46aaa40d6fc94fb95f01119ea9a561c2
Author: Anton Blanchard <anton@samba.org>
Date:   Sat Oct 1 20:41:56 2016 +1000

    powerpc/pseries: Use H_CLEAR_HPT to clear MMU hash table during kexec
    
    An hcall was recently added that does exactly what we need during kexec
    - it clears the entire MMU hash table, ignoring any VRMA mappings.
    
    Try it and fall back to the old method if we get a failure.
    
    On a POWER8 box with 5TB of memory, this reduces the time it takes to
    kexec a new kernel from from 4 minutes to 1 minute.
    
    Signed-off-by: Anton Blanchard <anton@samba.org>
    [mpe: Split into separate functions and tweak function naming]
    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 91a62bac46aaa40d6fc94fb95f01119ea9a561c2
# < make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-next_corenet64_smp_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  corenet64_smp_defconfig
# make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-next_corenet64_smp_defconfig_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-next_corenet64_smp_defconfig_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/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
  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/dtc/dtc.o
  HOSTCC  scripts/genksyms/genksyms.o
  HOSTCC  scripts/dtc/flattree.o
  HOSTCC  scripts/dtc/fstree.o
  CC      scripts/mod/empty.o
  SHIPPED scripts/genksyms/parse.tab.c
  HOSTCC  scripts/kallsyms
  HOSTCC  scripts/mod/mk_elfconfig
  HOSTCC  scripts/dtc/data.o
  SHIPPED scripts/genksyms/lex.lex.c
  HOSTCC  scripts/dtc/livetree.o
  CC      scripts/mod/devicetable-offsets.s
  HOSTCC  scripts/dtc/treesource.o
  SHIPPED scripts/genksyms/keywords.hash.c
  HOSTCC  scripts/dtc/srcpos.o
  MKELF   scripts/mod/elfconfig.h
  GEN     scripts/mod/devicetable-offsets.h
  HOSTCC  scripts/mod/sumversion.o
  HOSTCC  scripts/dtc/checks.o
  HOSTCC  scripts/dtc/util.o
  SHIPPED scripts/genksyms/parse.tab.h
  HOSTCC  scripts/genksyms/parse.tab.o
  HOSTCC  scripts/genksyms/lex.lex.o
  CC      kernel/bounds.s
  HOSTCC  scripts/conmakehash
  CHK     include/generated/timeconst.h
  UPD     include/generated/timeconst.h
  CHK     include/generated/bounds.h
  UPD     include/generated/bounds.h
  CC      arch/powerpc/kernel/asm-offsets.s
  SHIPPED scripts/dtc/dtc-lexer.lex.c
  HOSTCC  scripts/mod/modpost.o
  HOSTCC  scripts/sortextable
  HOSTCC  scripts/mod/file2alias.o
  SHIPPED scripts/dtc/dtc-parser.tab.h
  SHIPPED scripts/dtc/dtc-parser.tab.c
  HOSTCC  scripts/asn1_compiler
  HOSTCC  scripts/dtc/dtc-lexer.lex.o
  HOSTCC  scripts/dtc/dtc-parser.tab.o
  CHK     include/generated/asm-offsets.h
  UPD     include/generated/asm-offsets.h
  CALL    /home/kisskb/slave/src/scripts/checksyscalls.sh
  HOSTLD  scripts/genksyms/genksyms
  HOSTLD  scripts/dtc/dtc
  HOSTLD  scripts/mod/modpost
  HOSTCC  usr/gen_init_cpio
  CC      init/main.o
  CHK     include/generated/compile.h
  CC      init/do_mounts.o
  CC      init/do_mounts_rd.o
  CC      init/do_mounts_initrd.o
  CC      init/initramfs.o
  CC      init/init_task.o
  UPD     include/generated/compile.h
  CC      arch/powerpc/mm/fault.o
  AS      arch/powerpc/lib/string.o
  CC      arch/powerpc/kernel/cputable.o
  CC      arch/powerpc/lib/alloc.o
  GEN     usr/initramfs_data.cpio.gz
  AS      usr/initramfs_data.o
  LD      usr/built-in.o
  AS      arch/powerpc/lib/crtsavres.o
  CC      arch/powerpc/lib/ppc_ksyms.o
  CC      arch/powerpc/lib/code-patching.o
  CC      arch/powerpc/kernel/ptrace.o
  CC      init/version.o
  CC      arch/powerpc/mm/mem.o
  CC      arch/powerpc/lib/feature-fixups.o
  CC      arch/powerpc/mm/pgtable.o
  AS      arch/powerpc/lib/checksum_64.o
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S: Assembler messages:
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:233: Error: unrecognized opcode: `ex_table(100b,.Lsrc_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:237: Error: unrecognized opcode: `ex_table(200b,.Ldest_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:259: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:260: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:262: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:263: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:274: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:275: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:278: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:279: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:283: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:284: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:287: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:288: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:291: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:292: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:295: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:296: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:300: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:301: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:304: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:305: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:310: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:311: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:314: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:315: Error: unrecognized opcode: `ex_table(150b,.Lsrc_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:319: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:320: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:323: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:324: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:327: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:328: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:331: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:332: Error: unrecognized opcode: `ex_table(250b,.Ldest_error)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:351: Error: unrecognized opcode: `ex_table(100b,.Lsrc_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:354: Error: unrecognized opcode: `ex_table(200b,.Ldest_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:364: Error: unrecognized opcode: `ex_table(100b,.Lsrc_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:367: Error: unrecognized opcode: `ex_table(200b,.Ldest_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:375: Error: unrecognized opcode: `ex_table(100b,.Lsrc_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:378: Error: unrecognized opcode: `ex_table(200b,.Ldest_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:386: Error: unrecognized opcode: `ex_table(100b,.Lsrc_error_nr)'
/home/kisskb/slave/src/arch/powerpc/lib/checksum_64.S:389: Error: unrecognized opcode: `ex_table(200b,.Ldest_error_nr)'
/home/kisskb/slave/src/scripts/Makefile.build:326: recipe for target 'arch/powerpc/lib/checksum_64.o' failed
make[2]: *** [arch/powerpc/lib/checksum_64.o] Error 1
make[2]: *** Waiting for unfinished jobs....
  CC      arch/powerpc/kernel/syscalls.o
  CC      arch/powerpc/mm/mmap.o
  CC      arch/powerpc/sysdev/mpic.o
  CC      arch/powerpc/platforms/85xx/smp.o
/home/kisskb/slave/src/Makefile:968: recipe for target 'arch/powerpc/lib' failed
make[1]: *** [arch/powerpc/lib] Error 2
make[1]: *** Waiting for unfinished jobs....
  CC      arch/powerpc/mm/init_64.o
  CC      arch/powerpc/sysdev/mpic_msi.o
  CC      arch/powerpc/kernel/irq.o
  CC      arch/powerpc/platforms/85xx/common.o
  CC      arch/powerpc/kernel/align.o
  LD      init/mounts.o
  LD      init/built-in.o
  CC      arch/powerpc/platforms/85xx/corenet_generic.o
  CC      arch/powerpc/sysdev/mpic_u3msi.o
  CC      arch/powerpc/sysdev/ehv_pic.o
  CC      arch/powerpc/sysdev/msi_bitmap.o
  CC      arch/powerpc/sysdev/fsl_soc.o
  CC      arch/powerpc/kernel/signal_32.o
  CC      arch/powerpc/mm/pgtable_64.o
  CC      arch/powerpc/sysdev/fsl_mpic_err.o
  CC      arch/powerpc/kernel/pmc.o
  CC      arch/powerpc/kernel/vdso.o
  CC      arch/powerpc/sysdev/fsl_pci.o
  CC      arch/powerpc/sysdev/fsl_msi.o
  LD      arch/powerpc/platforms/85xx/built-in.o
  LD      arch/powerpc/platforms/built-in.o
  CC      arch/powerpc/sysdev/fsl_rcpm.o
  CC      arch/powerpc/kernel/process.o
  CPP     arch/powerpc/kernel/systbl_chk.i
  CC      arch/powerpc/sysdev/fsl_lbc.o
  CC      arch/powerpc/mm/mmu_context_nohash.o
  CC      arch/powerpc/mm/tlb_nohash.o
  CC      arch/powerpc/sysdev/fsl_rio.o
  CC      arch/powerpc/sysdev/fsl_rmu.o
  CC      arch/powerpc/sysdev/rtc_cmos_setup.o
  CC      arch/powerpc/kernel/idle.o
  CC      arch/powerpc/kernel/signal.o
  CC      arch/powerpc/sysdev/indirect_pci.o
  AS      arch/powerpc/mm/tlb_nohash_low.o
  AS      arch/powerpc/mm/tlb_low_64e.o
  CC      arch/powerpc/mm/pgtable-book3e.o
  CC      arch/powerpc/mm/fsl_booke_mmu.o
  CC      arch/powerpc/mm/hugetlbpage.o
{standard input}: Assembler messages:
{standard input}:3228: Error: can't resolve `.fixup' {.fixup section} - `.LFB2468' {.text section}
{standard input}:3228: Error: expression too complex
{standard input}:25444: Error: can't resolve `.fixup' {.fixup section} - `.LFB2468' {.text section}
{standard input}:25444: Error: expression too complex
{standard input}: Error: .size expression for .fsl_rio_config_read does not evaluate to a constant
  CC      arch/powerpc/mm/hugetlbpage-book3e.o
/home/kisskb/slave/src/scripts/Makefile.build:289: recipe for target 'arch/powerpc/sysdev/fsl_rio.o' failed
make[2]: *** [arch/powerpc/sysdev/fsl_rio.o] Error 1
make[2]: *** Waiting for unfinished jobs....
  CC      arch/powerpc/kernel/sysfs.o
  CC      arch/powerpc/kernel/cacheinfo.o
  CC      arch/powerpc/kernel/time.o
/home/kisskb/slave/src/Makefile:968: recipe for target 'arch/powerpc/sysdev' failed
make[1]: *** [arch/powerpc/sysdev] Error 2
  CC      arch/powerpc/kernel/prom.o
  CC      arch/powerpc/kernel/traps.o
  CC      arch/powerpc/kernel/setup-common.o
  CC      arch/powerpc/kernel/udbg.o
  AS      arch/powerpc/kernel/misc.o
  CC      arch/powerpc/kernel/io.o
  CC      arch/powerpc/kernel/dma.o
  AS      arch/powerpc/kernel/misc_64.o
  CC      arch/powerpc/kernel/of_platform.o
  CC      arch/powerpc/kernel/prom_parse.o
  CC      arch/powerpc/kernel/setup_64.o
  LD      arch/powerpc/mm/built-in.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
  LDS     arch/powerpc/kernel/vdso32/vdso32.lds
  VDSO32A arch/powerpc/kernel/vdso32/sigtramp.o
  AS      arch/powerpc/kernel/exceptions-64e.o
  LDS     arch/powerpc/kernel/vdso64/vdso64.lds
  VDSO32A arch/powerpc/kernel/vdso32/gettimeofday.o
  AS      arch/powerpc/kernel/vdso64/sigtramp.o
  AS      arch/powerpc/kernel/idle_book3e.o
  VDSO32A arch/powerpc/kernel/vdso32/datapage.o
  AS      arch/powerpc/kernel/vdso64/gettimeofday.o
  VDSO32A arch/powerpc/kernel/vdso32/cacheflush.o
  CC      arch/powerpc/kernel/vecemu.o
  AS      arch/powerpc/kernel/vdso64/datapage.o
  VDSO32A arch/powerpc/kernel/vdso32/note.o
  AS      arch/powerpc/kernel/vdso64/cacheflush.o
  CC      arch/powerpc/kernel/proc_powerpc.o
  VDSO32A arch/powerpc/kernel/vdso32/getcpu.o
  AS      arch/powerpc/kernel/vdso64/note.o
  VDSO32L arch/powerpc/kernel/vdso32/vdso32.so.dbg
  AS      arch/powerpc/kernel/vdso64/getcpu.o
  OBJCOPY arch/powerpc/kernel/vdso32/vdso32.so
  AS      arch/powerpc/kernel/vdso32/vdso32_wrapper.o
  CC      arch/powerpc/kernel/module.o
  VDSO64L arch/powerpc/kernel/vdso64/vdso64.so.dbg
  LD      arch/powerpc/kernel/vdso32/built-in.o
  CC      arch/powerpc/kernel/module_64.o
  OBJCOPY arch/powerpc/kernel/vdso64/vdso64.so
  AS      arch/powerpc/kernel/vdso64/vdso64_wrapper.o
  LD      arch/powerpc/kernel/vdso64/built-in.o
  AS      arch/powerpc/kernel/cpu_setup_fsl_booke.o
  CC      arch/powerpc/kernel/dbell.o
  CC      arch/powerpc/kernel/dma-iommu.o
  CC      arch/powerpc/kernel/iommu.o
  CC      arch/powerpc/kernel/ppc_ksyms.o
  CC      arch/powerpc/kernel/smp.o
  CC      arch/powerpc/kernel/legacy_serial.o
  CC      arch/powerpc/kernel/udbg_16550.o
  CC      arch/powerpc/kernel/dma-swiotlb.o
  CC      arch/powerpc/kernel/pci_64.o
  CC      arch/powerpc/kernel/pci_dn.o
  CC      arch/powerpc/kernel/pci-hotplug.o
  CC      arch/powerpc/kernel/isa-bridge.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/audit.o
  CC      arch/powerpc/kernel/iomap.o
  CC      arch/powerpc/kernel/compat_audit.o
  CC      arch/powerpc/kernel/epapr_paravirt.o
  AS      arch/powerpc/kernel/epapr_hcalls.o
  AS      arch/powerpc/kernel/head_64.o
  LDS     arch/powerpc/kernel/vmlinux.lds
  AS      arch/powerpc/kernel/fpu.o
  AS      arch/powerpc/kernel/vector.o
  AS      arch/powerpc/kernel/entry_64.o
  CALL    /home/kisskb/slave/src/arch/powerpc/kernel/systbl_chk.sh
  AS      arch/powerpc/kernel/systbl.o
  LD      arch/powerpc/kernel/built-in.o
make[1]: Leaving directory '/home/kisskb/slave/build/powerpc-next_corenet64_smp_defconfig_powerpc-5.3'
Makefile:150: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
Command 'make -j 10 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-next_corenet64_smp_defconfig_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-next_corenet64_smp_defconfig_powerpc-5.3
# Build took: 0:00:16.443025