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linux-stable/arch/powerpc/platforms/85xx
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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
..
bsc913x_qds.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
bsc913x_rdb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
c293pcie.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
common.c powerpc/85xx: remove mostly pointless mpc85xx_qe_init() 2019-11-17 01:55:42 -06:00
corenet_generic.c powerpc/85xx: Fix declaration made after definition 2020-11-19 14:50:13 +11:00
ge_imp3a.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
Kconfig powerpc: retire sbc8548 board support 2021-08-27 00:48:11 +10:00
ksi8560.c powerpc: Move 32-bit probe() machine to later in the boot process 2016-07-21 19:06:42 +10:00
Makefile powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n 2021-10-09 00:15:58 +11:00
mpc85xx.h powerpc/85xx: remove mostly pointless mpc85xx_qe_init() 2019-11-17 01:55:42 -06:00
mpc85xx_ads.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mpc85xx_cds.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
mpc85xx_ds.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mpc85xx_mds.c soc: fsl: qe: move calls of qe_ic_init out of arch/powerpc/ 2019-12-09 13:54:31 -06:00
mpc85xx_pm_ops.c powerpc/85xx: fix timebase sync issue when CONFIG_HOTPLUG_CPU=n 2021-10-09 00:15:58 +11:00
mpc85xx_rdb.c soc: fsl: qe: move calls of qe_ic_init out of arch/powerpc/ 2019-12-09 13:54:31 -06:00
mpc8536_ds.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mvme2500.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
p1010rdb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
p1022_ds.c powerpc/dma: use the generic direct mapping bypass 2019-02-18 22:41:04 +11:00
p1022_rdk.c powerpc/dma: use the generic direct mapping bypass 2019-02-18 22:41:04 +11:00
p1023_rdb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ppa8548.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
qemu_e500.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
sgy_cts1000.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
smp.c powerpc/85xx: Fix oops when CONFIG_FSL_PMC=n 2021-11-29 17:47:05 +11:00
smp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
socrates.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
socrates_fpga_pic.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
socrates_fpga_pic.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
stx_gp3.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
t1042rdb_diu.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tqm85xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
twr_p102x.c ARM: SoC-related driver updates 2020-02-08 14:04:19 -08:00
xes_mpc85xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 419 2019-06-05 17:37:15 +02:00