• J
    powerpc: Disable doorbells on Power8 DD1.x · bd6ba351
    Joel Stanley 提交于
    These processors do not currently support doorbell IPIs, so remove them
    from the feature list if we are at DD 1.xx for the 0x004d part.
    
    This fixes a regression caused by d4e58e59 (powerpc/powernv: Enable
    POWER8 doorbell IPIs). With that patch the kernel would hang at boot
    when calling smp_call_function_many, as the doorbell would not be
    received by the target CPUs:
    
      .smp_call_function_many+0x2bc/0x3c0 (unreliable)
      .on_each_cpu_mask+0x30/0x100
      .cpuidle_register_driver+0x158/0x1a0
      .cpuidle_register+0x2c/0x110
      .powernv_processor_idle_init+0x23c/0x2c0
      .do_one_initcall+0xd4/0x260
      .kernel_init_freeable+0x25c/0x33c
      .kernel_init+0x1c/0x120
      .ret_from_kernel_thread+0x58/0x7c
    
    Fixes: d4e58e59 (powerpc/powernv: Enable POWER8 doorbell IPIs)
    Signed-off-by: NJoel Stanley <joel@jms.id.au>
    Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
    bd6ba351
cputable.h 21.7 KB