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Anju T Sudhakar 7ccc4fe5ff powerpc/perf: Remove sched_task function defined for thread-imc 
Call trace observed while running perf-fuzzer:

  CPU: 43 PID: 9088 Comm: perf_fuzzer Not tainted 4.13.0-32-generic #35~lp1746225
  task: c000003f776ac900 task.stack: c000003f77728000
  NIP: c000000000299b70 LR: c0000000002a4534 CTR: c00000000029bb80
  REGS: c000003f7772b760 TRAP: 0700   Not tainted  (4.13.0-32-generic)
  MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>
    CR: 24008822  XER: 00000000
  CFAR: c000000000299a70 SOFTE: 0
  GPR00: c0000000002a4534 c000003f7772b9e0 c000000001606200 c000003fef858908
  GPR04: c000003f776ac900 0000000000000001 ffffffffffffffff 0000003fee730000
  GPR08: 0000000000000000 0000000000000000 c0000000011220d8 0000000000000002
  GPR12: c00000000029bb80 c000000007a3d900 0000000000000000 0000000000000000
  GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
  GPR20: 0000000000000000 0000000000000000 c000003f776ad090 c000000000c71354
  GPR24: c000003fef716780 0000003fee730000 c000003fe69d4200 c000003f776ad330
  GPR28: c0000000011220d8 0000000000000001 c0000000014c6108 c000003fef858900
  NIP [c000000000299b70] perf_pmu_sched_task+0x170/0x180
  LR [c0000000002a4534] __perf_event_task_sched_in+0xc4/0x230
  Call Trace:
    perf_iterate_sb+0x158/0x2a0 (unreliable)
    __perf_event_task_sched_in+0xc4/0x230
    finish_task_switch+0x21c/0x310
    __schedule+0x304/0xb80
    schedule+0x40/0xc0
    do_wait+0x254/0x2e0
    kernel_wait4+0xa0/0x1a0
    SyS_wait4+0x64/0xc0
    system_call+0x58/0x6c
  Instruction dump:
  3beafea0 7faa4800 409eff18 e8010060 eb610028 ebc10040 7c0803a6 38210050
  eb81ffe0 eba1ffe8 ebe1fff8 4e800020 <0fe00000> 4bffffbc 60000000 60420000
  ---[ end trace 8c46856d314c1811 ]---

The context switch call-backs for thread-imc are defined in sched_task function.
So when thread-imc events are grouped with software pmu events,
perf_pmu_sched_task hits the WARN_ON_ONCE condition, since software PMUs are
assumed not to have a sched_task defined.

Patch to move the thread_imc enable/disable opal call back from sched_task to
event_[add/del] function

Fixes: f74c89bd80 ("powerpc/perf: Add thread IMC PMU support")
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-08-08 00:32:32 +10:00
..
alpha alpha: Remove custom dec_and_lock() implementation 2018-06-12 23:33:24 +02:00
arc mm: introduce ARCH_HAS_PTE_SPECIAL 2018-06-07 17:34:35 -07:00
arm ARM: SoC fixes for 4.18-rc 2018-06-30 14:08:06 -07:00
arm64 ARM: SoC fixes for 4.18-rc 2018-06-30 14:08:06 -07:00
c6x Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-04 20:27:54 -07:00
h8300 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-04 20:27:54 -07:00
hexagon hexagon: drop the unused variable zero_page_mask 2018-06-15 07:55:25 +09:00
ia64 - Error path bug fix for overflow tests (Dan) 2018-06-12 18:28:00 -07:00
m68k macintosh/via-pmu: Replace via-pmu68k driver with via-pmu driver 2018-07-31 19:56:42 +10:00
microblaze Microblaze patches for 4.18-rc3 2018-06-27 09:49:30 -07:00
mips MIPS: Add ksig argument to rseq_{signal_deliver,handle_notify_resume} 2018-06-24 10:33:03 -07:00
nds32 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-04 20:27:54 -07:00
nios2 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-04 20:27:54 -07:00
openrisc Kbuild updates for v4.18 2018-06-06 11:00:15 -07:00
parisc parisc: Build kernel without -ffunction-sections 2018-06-29 17:27:20 +02:00
powerpc powerpc/perf: Remove sched_task function defined for thread-imc 2018-08-08 00:32:32 +10:00
riscv RISC-V Updates for the 4.18 Merge Window 2018-06-16 06:42:43 +09:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2018-06-19 07:44:51 +09:00
sh arch/*: Kconfig: fix documentation for NMI watchdog 2018-06-15 12:48:59 -03:00
sparc arch/*: Kconfig: fix documentation for NMI watchdog 2018-06-15 12:48:59 -03:00
um Solve a series of broken links for files under Documentation: 2018-06-17 05:25:18 +09:00
unicore32 docs: Fix some broken references 2018-06-15 18:10:01 -03:00
x86 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-06-30 11:42:14 -07:00
xtensa docs: Fix some broken references 2018-06-15 18:10:01 -03:00
.gitignore
Kconfig docs: Fix some broken references 2018-06-15 18:10:01 -03:00