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34973baea0f0b8ae6e013abdfbd9b97f1bfdde99
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commit 34973baea0f0b8ae6e013abdfbd9b97f1bfdde99
Author: Nicholas Piggin <npiggin@gmail.com>
Date:   Mon Mar 20 16:01:52 2017 +1000

    powerpc/64s: idle POWER8 avoid full state loss recovery where possible
    
    If not all threads were in winkle, full state loss recovery is not
    necessary and can be avoided. A previous patch removed this optimisation
    due to some complexity with the implementation. Re-implement it by
    counting the number of threads in winkle with the per-core idle state.
    Only restore full state loss if all threads were in winkle.
    
    This has a small window of false positives right before threads execute
    winkle and just after they wake up, when the winkle count does not
    reflect the true number of threads in winkle. This is not a significant
    problem in comparison with even the minimum winkle duration. For
    correctness, a false positive is not a problem (only false negatives
    would be).
    
    Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
    Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
    Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-gcc --version
# < git log --format=%s --max-count=1 34973baea0f0b8ae6e013abdfbd9b97f1bfdde99
# < make -j 48 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-next_85xx_ge_imp3a_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  85xx/ge_imp3a_defconfig
# make -j 48 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-next_85xx_ge_imp3a_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  
make[1]: Entering directory '/home/kisskb/slave/build/powerpc-next_85xx_ge_imp3a_defconfig_powerpc'
  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
  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/conmakehash
  HOSTCC  scripts/sortextable
  CC      scripts/mod/empty.o
  HOSTCC  scripts/mod/mk_elfconfig
  CC      scripts/mod/devicetable-offsets.s
  HOSTCC  scripts/dtc/dtc.o
  HOSTCC  scripts/dtc/flattree.o
  HOSTCC  scripts/dtc/fstree.o
  HOSTCC  scripts/dtc/data.o
  HOSTCC  scripts/dtc/livetree.o
  HOSTCC  scripts/dtc/treesource.o
  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.c
  SHIPPED scripts/dtc/dtc-parser.tab.h
  HOSTCC  scripts/dtc/dtc-parser.tab.o
  HOSTCC  scripts/dtc/dtc-lexer.lex.o
  GEN     scripts/mod/devicetable-offsets.h
  CHK     include/generated/timeconst.h
  CC      kernel/bounds.s
  MKELF   scripts/mod/elfconfig.h
  HOSTCC  scripts/mod/modpost.o
  HOSTCC  scripts/mod/file2alias.o
  HOSTCC  scripts/mod/sumversion.o
  UPD     include/generated/timeconst.h
  CHK     include/generated/bounds.h
  UPD     include/generated/bounds.h
  CC      arch/powerpc/kernel/asm-offsets.s
  CHK     include/generated/asm-offsets.h
  UPD     include/generated/asm-offsets.h
  CALL    /home/kisskb/slave/src/scripts/checksyscalls.sh
  HOSTLD  scripts/dtc/dtc
  HOSTLD  scripts/mod/modpost
  CC      init/main.o
  CHK     include/generated/compile.h
  HOSTCC  usr/gen_init_cpio
  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      init/version.o
  CC      arch/powerpc/mm/fault.o
  CC      arch/powerpc/mm/init_32.o
  CC      arch/powerpc/mm/pgtable.o
  CC      arch/powerpc/mm/mem.o
  CC      arch/powerpc/mm/mmap.o
  CC      arch/powerpc/mm/pgtable_32.o
  AS      arch/powerpc/mm/tlb_nohash_low.o
  CC      arch/powerpc/mm/tlb_nohash.o
  CC      arch/powerpc/mm/hugetlbpage.o
  CC      arch/powerpc/mm/highmem.o
  CC      arch/powerpc/mm/mmu_context_nohash.o
  CC      arch/powerpc/mm/init-common.o
  CC      arch/powerpc/mm/fsl_booke_mmu.o
  CC      arch/powerpc/lib/code-patching.o
  AS      arch/powerpc/lib/checksum_32.o
  AS      arch/powerpc/lib/copy_32.o
  AS      arch/powerpc/lib/div64.o
  AS      arch/powerpc/lib/string.o
  AS      arch/powerpc/lib/crtsavres.o
  CC      arch/powerpc/lib/feature-fixups.o
  CC      arch/powerpc/lib/alloc.o
  CC      arch/powerpc/lib/checksum_wrappers.o
In file included from /home/kisskb/slave/src/arch/powerpc/mm/pgtable.c:32:0:
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_core_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:75:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_thread_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:81:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/scripts/Makefile.build:294: recipe for target 'arch/powerpc/mm/pgtable.o' failed
make[2]: *** [arch/powerpc/mm/pgtable.o] Error 1
make[2]: *** Waiting for unfinished jobs....
  CC      arch/powerpc/platforms/85xx/smp.o
In file included from /home/kisskb/slave/src/arch/powerpc/mm/mem.c:49:0:
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_core_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:75:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_thread_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:81:21: error: 'mm_context_t' has no member named 'npu_context'
  CC      arch/powerpc/platforms/85xx/mpc85xx_pm_ops.o
  CC      arch/powerpc/platforms/85xx/common.o
  CC      arch/powerpc/platforms/85xx/ge_imp3a.o
/home/kisskb/slave/src/scripts/Makefile.build:294: recipe for target 'arch/powerpc/mm/mem.o' failed
make[2]: *** [arch/powerpc/mm/mem.o] Error 1
  CC      arch/powerpc/sysdev/mpic_msi.o
  CC      arch/powerpc/sysdev/mpic.o
  CC      arch/powerpc/sysdev/msi_bitmap.o
  CC      arch/powerpc/sysdev/mmio_nvram.o
  CC      arch/powerpc/sysdev/mpic_u3msi.o
  GEN     usr/initramfs_data.cpio.gz
  CC      arch/powerpc/sysdev/fsl_pci.o
In file included from /home/kisskb/slave/src/arch/powerpc/mm/init_32.c:45:0:
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_core_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:75:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_thread_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:81:21: error: 'mm_context_t' has no member named 'npu_context'
  CC      arch/powerpc/sysdev/fsl_msi.o
  CC      arch/powerpc/sysdev/fsl_soc.o
In file included from /home/kisskb/slave/src/arch/powerpc/mm/hugetlbpage.c:22:0:
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_core_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:75:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_thread_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:81:21: error: 'mm_context_t' has no member named 'npu_context'
  CC      arch/powerpc/sysdev/fsl_lbc.o
  CC      arch/powerpc/sysdev/fsl_pmc.o
  CC      arch/powerpc/sysdev/fsl_mpic_err.o
/home/kisskb/slave/src/scripts/Makefile.build:294: recipe for target 'arch/powerpc/mm/hugetlbpage.o' failed
make[2]: *** [arch/powerpc/mm/hugetlbpage.o] Error 1
  CC      arch/powerpc/sysdev/cpm2.o
In file included from /home/kisskb/slave/src/arch/powerpc/mm/tlb_nohash.c:43:0:
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_core_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:75:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h: In function 'mm_is_thread_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:81:21: error: 'mm_context_t' has no member named 'npu_context'
/home/kisskb/slave/src/scripts/Makefile.build:294: recipe for target 'arch/powerpc/mm/init_32.o' failed
make[2]: *** [arch/powerpc/mm/init_32.o] Error 1
  CC      arch/powerpc/sysdev/cpm_common.o
  CC      arch/powerpc/sysdev/indirect_pci.o
/home/kisskb/slave/src/arch/powerpc/mm/tlb_nohash.c: In function 'mm_is_core_local':
/home/kisskb/slave/src/arch/powerpc/include/asm/tlb.h:77:1: error: control reaches end of non-void function [-Werror=return-type]
cc1: all warnings being treated as errors
  CC      arch/powerpc/kernel/ptrace.o
/home/kisskb/slave/src/scripts/Makefile.build:294: recipe for target 'arch/powerpc/mm/tlb_nohash.o' failed
make[2]: *** [arch/powerpc/mm/tlb_nohash.o] Error 1
  CC      arch/powerpc/kernel/vdso.o
  CC      arch/powerpc/kernel/cputable.o
  CC      arch/powerpc/kernel/signal_32.o
  CC      arch/powerpc/kernel/align.o
  CC      arch/powerpc/kernel/pmc.o
  CC      arch/powerpc/kernel/syscalls.o
  CC      arch/powerpc/kernel/irq.o
  CC      arch/powerpc/sysdev/cpm2_pic.o
  LD      arch/powerpc/crypto/built-in.o
  CC      arch/powerpc/kernel/process.o
  CC      arch/powerpc/kernel/idle.o
  CPP     arch/powerpc/kernel/systbl_chk.i
  CC      arch/powerpc/sysdev/ge/ge_pic.o
  CC      arch/powerpc/kernel/signal.o
  LD      arch/powerpc/net/built-in.o
  CC      arch/powerpc/kernel/sysfs.o
  CC      arch/powerpc/kernel/cacheinfo.o
  CC      arch/powerpc/kernel/prom.o
  CC      arch/powerpc/kernel/traps.o
  CC      arch/powerpc/kernel/time.o
  CC      arch/powerpc/kernel/udbg.o
  CC      arch/powerpc/kernel/setup-common.o
  LD      arch/powerpc/lib/built-in.o
  CC      arch/powerpc/kernel/io.o
  AS      arch/powerpc/kernel/misc.o
  CC      arch/powerpc/kernel/dma.o
  AS      arch/powerpc/kernel/misc_32.o
  CC      arch/powerpc/kernel/prom_parse.o
  CC      arch/powerpc/kernel/of_platform.o
  CC      arch/powerpc/perf/callchain.o
/home/kisskb/slave/src/Makefile:1002: recipe for target 'arch/powerpc/mm' failed
make[1]: *** [arch/powerpc/mm] Error 2
make[1]: *** Waiting for unfinished jobs....
  AS      usr/initramfs_data.o
  CC      arch/powerpc/kernel/proc_powerpc.o
  CC      arch/powerpc/perf/perf_regs.o
  CC      arch/powerpc/perf/core-fsl-emb.o
  CC      arch/powerpc/perf/e500-pmu.o
  LD      usr/built-in.o
  CC      arch/powerpc/perf/e6500-pmu.o
  CC      arch/powerpc/kernel/smp-tbsync.o
  LDS     arch/powerpc/kernel/vdso32/vdso32.lds
  AS      arch/powerpc/kernel/idle_e500.o
  CC      arch/powerpc/kernel/module.o
  VDSO32A arch/powerpc/kernel/vdso32/sigtramp.o
  VDSO32A arch/powerpc/kernel/vdso32/gettimeofday.o
  CC      arch/powerpc/kernel/module_32.o
  VDSO32A arch/powerpc/kernel/vdso32/cacheflush.o
  VDSO32A arch/powerpc/kernel/vdso32/datapage.o
  LD      arch/powerpc/sysdev/ge/built-in.o
  AS      arch/powerpc/kernel/cpu_setup_fsl_booke.o
  VDSO32A arch/powerpc/kernel/vdso32/note.o
  CC      arch/powerpc/kernel/dbell.o
  AS      arch/powerpc/kernel/entry_32.o
  CC      arch/powerpc/kernel/setup_32.o
  CC      arch/powerpc/kernel/legacy_serial.o
  CC      arch/powerpc/kernel/smp.o
  CC      arch/powerpc/kernel/udbg_16550.o
  CC      arch/powerpc/kernel/msi.o
  CC      arch/powerpc/kernel/pci-common.o
  CC      arch/powerpc/kernel/pci_of_scan.o
  CC      arch/powerpc/kernel/pci_32.o
  CC      arch/powerpc/kernel/iomap.o
  LDS     arch/powerpc/kernel/vmlinux.lds
  CC      arch/powerpc/kernel/dma-swiotlb.o
  AS      arch/powerpc/kernel/head_fsl_booke.o
  VDSO32L arch/powerpc/kernel/vdso32/vdso32.so.dbg
  LD      arch/powerpc/platforms/85xx/built-in.o
  CALL    /home/kisskb/slave/src/arch/powerpc/kernel/systbl_chk.sh
  CC      arch/powerpc/math-emu/fsqrts.o
  CC      arch/powerpc/math-emu/fre.o
  CC      arch/powerpc/math-emu/math.o
  CC      arch/powerpc/math-emu/fsqrt.o
  LD      arch/powerpc/platforms/built-in.o
  CC      arch/powerpc/math-emu/frsqrtes.o
  CC      arch/powerpc/math-emu/mtfsf.o
  CC      arch/powerpc/math-emu/mtfsfi.o
  CC      arch/powerpc/math-emu/fabs.o
  AS      arch/powerpc/kernel/systbl.o
  OBJCOPY arch/powerpc/kernel/vdso32/vdso32.so
  CC      arch/powerpc/math-emu/fadd.o
  CC      arch/powerpc/math-emu/fadds.o
  AS      arch/powerpc/kernel/vdso32/vdso32_wrapper.o
  CC      arch/powerpc/math-emu/fcmpo.o
  CC      arch/powerpc/math-emu/fcmpu.o
  CC      arch/powerpc/math-emu/fctiw.o
  CC      arch/powerpc/math-emu/fdiv.o
  LD      init/mounts.o
  CC      arch/powerpc/math-emu/fctiwz.o
  CC      arch/powerpc/math-emu/fmadd.o
  LD      arch/powerpc/kernel/vdso32/built-in.o
  LD      init/built-in.o
  CC      arch/powerpc/math-emu/fdivs.o
  CC      arch/powerpc/math-emu/fmadds.o
  CC      arch/powerpc/math-emu/fmsub.o
  CC      arch/powerpc/math-emu/fmul.o
  CC      arch/powerpc/math-emu/fmsubs.o
  CC      arch/powerpc/math-emu/fmuls.o
  CC      arch/powerpc/math-emu/fnabs.o
  CC      arch/powerpc/math-emu/fnmadd.o
  CC      arch/powerpc/math-emu/fneg.o
  CC      arch/powerpc/math-emu/fnmadds.o
  LD      arch/powerpc/sysdev/built-in.o
  CC      arch/powerpc/math-emu/fnmsub.o
  CC      arch/powerpc/math-emu/fnmsubs.o
  CC      arch/powerpc/math-emu/fres.o
  CC      arch/powerpc/math-emu/frsp.o
  CC      arch/powerpc/math-emu/lfs.o
  CC      arch/powerpc/math-emu/fsel.o
  CC      arch/powerpc/math-emu/frsqrte.o
  CC      arch/powerpc/math-emu/fsub.o
  CC      arch/powerpc/math-emu/fsubs.o
  CC      arch/powerpc/math-emu/mcrfs.o
  CC      arch/powerpc/math-emu/mffs.o
  CC      arch/powerpc/math-emu/mtfsb1.o
  CC      arch/powerpc/math-emu/mtfsb0.o
  CC      arch/powerpc/math-emu/lfd.o
  CC      arch/powerpc/math-emu/fmr.o
  CC      arch/powerpc/math-emu/stfiwx.o
  CC      arch/powerpc/math-emu/stfs.o
  CC      arch/powerpc/math-emu/stfd.o
  CC      arch/powerpc/math-emu/math_efp.o
  LD      arch/powerpc/perf/built-in.o
  LD      arch/powerpc/kernel/built-in.o
  LD      arch/powerpc/math-emu/built-in.o
make[1]: *** wait: No child processes.  Stop.
Makefile:152: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
Command 'make -j 48 ARCH=powerpc O=/home/kisskb/slave/build/powerpc-next_85xx_ge_imp3a_defconfig_powerpc CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-  ' returned non-zero exit status 2
# rm -rf /home/kisskb/slave/build/powerpc-next_85xx_ge_imp3a_defconfig_powerpc
# Build took: 0:00:09.226423