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linux/arch/powerpc/platforms
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Xiaoming Ni 3dc709e518 powerpc/85xx: Fix oops when CONFIG_FSL_PMC=n 
When CONFIG_FSL_PMC is set to n, no value is assigned to cpu_up_prepare
in the mpc85xx_pm_ops structure. As a result, oops is triggered in
smp_85xx_start_cpu().

  smp: Bringing up secondary CPUs ...
  kernel tried to execute user page (0) - exploit attempt? (uid: 0)
  BUG: Unable to handle kernel instruction fetch (NULL pointer?)
  Faulting instruction address: 0x00000000
  Oops: Kernel access of bad area, sig: 11 [#1]
  ...
  NIP [00000000] 0x0
  LR [c0021d2c] smp_85xx_kick_cpu+0xe8/0x568
  Call Trace:
  [c1051da8] [c0021cb8] smp_85xx_kick_cpu+0x74/0x568 (unreliable)
  [c1051de8] [c0011460] __cpu_up+0xc0/0x228
  [c1051e18] [c0031bbc] bringup_cpu+0x30/0x224
  [c1051e48] [c0031f3c] cpu_up.constprop.0+0x180/0x33c
  [c1051e88] [c00322e8] bringup_nonboot_cpus+0x88/0xc8
  [c1051eb8] [c07e67bc] smp_init+0x30/0x78
  [c1051ed8] [c07d9e28] kernel_init_freeable+0x118/0x2a8
  [c1051f18] [c00032d8] kernel_init+0x14/0x124
  [c1051f38] [c0010278] ret_from_kernel_thread+0x14/0x1c

Fixes: c45361abb9 ("powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n")
Reported-by: Martin Kennedy <hurricos@gmail.com>
Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
Tested-by: Martin Kennedy <hurricos@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211126041153.16926-1-nixiaoming@huawei.com
2021-11-29 17:47:05 +11:00
..
4xx powerpc: Add esr as a synonym for pt_regs.dsisr 2021-08-26 21:21:06 +10:00
8xx powerpc: bad_page_fault get registers from regs 2021-02-09 00:02:09 +11:00
40x powerpc: Remove IBM405 Erratum #77 2020-05-28 23:24:36 +10:00
44x powerpc/44x/fsp2: add missing of_node_put 2021-10-28 22:29:35 +11:00
52xx powerpc: Bulk conversion to generic_handle_domain_irq() 2021-08-12 11:39:41 +01:00
82xx powerpc: Bulk conversion to generic_handle_domain_irq() 2021-08-12 11:39:41 +01:00
83xx powerpc/83xx/mpc8349emitx: Drop unused variable 2021-11-15 15:46:45 +11:00
85xx powerpc/85xx: Fix oops when CONFIG_FSL_PMC=n 2021-11-29 17:47:05 +11:00
86xx powerpc: retire sbc8641d board support 2021-08-27 00:48:18 +10:00
512x powerpc: Bulk conversion to generic_handle_domain_irq() 2021-08-12 11:39:41 +01:00
amigaone powerpc/amigaone: Make amigaone_discover_phbs() static 2021-02-11 23:28:51 +11:00
book3s powerpc/vas: Fix potential NULL pointer dereference 2021-10-22 15:22:04 +11:00
cell mm: don't include <linux/blk-cgroup.h> in <linux/backing-dev.h> 2021-10-18 06:17:01 -06:00
chrp powerpc/chrp: Make hydra_init() static 2021-03-24 14:09:29 +11:00
embedded6xx powerpc: Refactor verification of MSR_RI 2021-08-26 21:21:07 +10:00
maple powerpc/pci: fix warning comparing pointer to 0 2021-03-29 13:22:13 +11:00
microwatt powerpc/microwatt: Add support for hardware random number generator 2021-06-21 21:16:32 +10:00
pasemi powerpc updates for 5.15 2021-09-03 11:22:50 -07:00
powermac powerpc/powermac: Remove stale declaration of pmac_md 2021-10-09 00:15:58 +11:00
powernv cxl for v5.16 2021-11-08 11:49:48 -08:00
ps3 powerpc updates for 5.15 2021-09-03 11:22:50 -07:00
pseries powerpc/pseries/ddw: Do not try direct mapping with persistent memory and one window 2021-11-15 15:46:46 +11:00
fsl_uli1575.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
Kconfig powerpc/64s: Make prom_init require RELOCATABLE 2021-06-25 14:47:19 +10:00
Kconfig.cputype powerpc: Re-enable ARCH_ENABLE_SPLIT_PMD_PTLOCK 2021-08-20 12:38:50 +10:00
Makefile powerpc: Add Microwatt platform 2021-06-21 21:15:26 +10:00