• Michael Ellerman's avatar
    powerpc/pseries: Mark accumulate_stolen_time() as notrace · eb8e20f8
    Michael Ellerman authored
    accumulate_stolen_time() is called prior to interrupt state being
    reconciled, which can trip the warning in arch_local_irq_restore():
    
      WARNING: CPU: 5 PID: 1017 at arch/powerpc/kernel/irq.c:258 .arch_local_irq_restore+0x9c/0x130
      ...
      NIP .arch_local_irq_restore+0x9c/0x130
      LR  .rb_start_commit+0x38/0x80
      Call Trace:
        .ring_buffer_lock_reserve+0xe4/0x620
        .trace_function+0x44/0x210
        .function_trace_call+0x148/0x170
        .ftrace_ops_no_ops+0x180/0x1d0
        ftrace_call+0x4/0x8
        .accumulate_stolen_time+0x1c/0xb0
        decrementer_common+0x124/0x160
    
    For now just mark it as notrace. We may change the ordering to call it
    after interrupt state has been reconciled, but that is a larger
    change.
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    Link: https://lore.kernel.org/r/20191024055932.27940-1-mpe@ellerman.id.au
    eb8e20f8
time.c 31.9 KB