[RFC] powerpc/pseries: Increase busy loop in pseries_cpu_die

[Han Pingtian]

On Mon, Feb 06, 2017 at 04:58:16PM -0200, Thiago Jung Bauermann wrote:
> This was reproduced in v4.10-rc6 as well, but I don't have a crash log
> handy for that version right now. Sorry.
> 
This is the crash log of v4.10:

roselp4 login: [  505.097727] sysrq: SysRq : Changing Loglevel
[  505.097743] sysrq: Loglevel set to 9
[  595.183727] iommu: Removing device 0021:01:00.0 from group 0
[  605.213053] pci_bus 0021:01: busn_res: [bus 01-ff] is released
[  605.213204] rpadlpar_io: slot PHB 33 removed
[  624.623544] min_free_kbytes is not updated to 16826 because user defined value 547628 is preferred
[  647.574039] cpu 152 (hwid 152) Ready to die...
[  647.803624] cpu 153 (hwid 153) Ready to die...
[  647.813371] cpu 154 (hwid 154) Ready to die...
[  647.823646] cpu 155 (hwid 155) Ready to die...
[  647.833371] cpu 156 (hwid 156) Ready to die...
[  647.843392] cpu 157 (hwid 157) Ready to die...
[  647.853368] cpu 158 (hwid 158) Ready to die...
[  647.863358] cpu 159 (hwid 159) Ready to die...
[  648.233756] cpu 144 (hwid 144) Ready to die...
[  648.383417] cpu 145 (hwid 145) Ready to die...
[  648.383488] cpu 146 (hwid 146) Ready to die...
[  648.383551] cpu 147 (hwid 147) Ready to die...
[  648.402845] cpu 148 (hwid 148) Ready to die...
[  648.403329] cpu 149 (hwid 149) Ready to die...
[  648.403384] cpu 150 (hwid 150) Ready to die...
[  648.413398] cpu 151 (hwid 151) Ready to die...
[  648.583466] cpu 136 (hwid 136) Ready to die...
[  648.833672] cpu 137 (hwid 137) Ready to die...
[  648.843481] cpu 138 (hwid 138) Ready to die...
[  648.843541] cpu 139 (hwid 139) Ready to die...
[  648.843589] cpu 140 (hwid 140) Ready to die...
[  648.843635] cpu 141 (hwid 141) Ready to die...
[  648.853426] cpu 142 (hwid 142) Ready to die...
[  648.863105] Querying DEAD? cpu 142 (142) shows 2
[  648.863697] cpu 143 (hwid 143) Ready to die...
[  649.013280] cpu 128 (hwid 128) Ready to die...
[  649.253575] cpu 129 (hwid 129) Ready to die...
[  649.253634] cpu 130 (hwid 130) Ready to die...
[  649.253689] cpu 131 (hwid 131) Ready to die...
[  649.253741] cpu 132 (hwid 132) Ready to die...
[  649.253793] cpu 133 (hwid 133) Ready to die...
[  649.253836] cpu 134 (hwid 134) Ready to die...
[  649.253885] cpu 135 (hwid 135) Ready to die...
[  649.353116] cpu 120 (hwid 120) Ready to die...
[  649.553776] cpu 121 (hwid 121) Ready to die...
[  649.563626] Querying DEAD? cpu 122 (122) shows 2
cpu 0x7b: Vector: 400 (Instruction Access) at [c000000007bc7d40]
    pc: f81f0070801f0078
    lr: f81f0070801f0078
    sp: ec20d28
   msr: 8000000042801000
  current = 0xc000000474838600
  paca    = 0xc000000007b65300   softe: 0        irq_happened: 0x01
    pid   = 0, comm = swapper/123
Linux version 4.10.0-rc6 (bauermann at u1604le) (gcc version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.4) ) #1 SMP Fri Feb 3 18:55:20 BRST 2017
WARNING: exception is not recoverable, can't continue
enter ? for help
SP (ec20d28) is in userspace
7b:mon> e
cpu 0x7b: Vector: 400 (Instruction Access) at [c000000007bc7d40]
    pc: f81f0070801f0078
    lr: f81f0070801f0078
    sp: ec20d28
   msr: 8000000042801000
  current = 0xc000000474838600
  paca    = 0xc000000007b65300   softe: 0        irq_happened: 0x01
    pid   = 0, comm = swapper/123
Linux version 4.10.0-rc6 (bauermann at u1604le) (gcc version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.4) ) #1 SMP Fri Feb 3 18:55:20 BRST 2017
7b:mon>