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kernel_optimize_test/arch/powerpc
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Christophe Leroy fc7da433fa powerpc/smp: Fix OOPS in topology_init() 
commit 8241461536f21bbe51308a6916d1c9fb2e6b75a7 upstream.

Running an SMP kernel on an UP platform not prepared for it,
I encountered the following OOPS:

	BUG: Kernel NULL pointer dereference on read at 0x00000034
	Faulting instruction address: 0xc0a04110
	Oops: Kernel access of bad area, sig: 11 [#1]
	BE PAGE_SIZE=4K SMP NR_CPUS=2 CMPCPRO
	Modules linked in:
	CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-pmac-00001-g230fedfaad21 #5234
	NIP:  c0a04110 LR: c0a040d8 CTR: c0a04084
	REGS: e100dda0 TRAP: 0300   Not tainted  (5.13.0-pmac-00001-g230fedfaad21)
	MSR:  00009032 <EE,ME,IR,DR,RI>  CR: 84000284  XER: 00000000
	DAR: 00000034 DSISR: 20000000
	GPR00: c0006bd4 e100de60 c1033320 00000000 00000000 c0942274 00000000 00000000
	GPR08: 00000000 00000000 00000001 00000063 00000007 00000000 c0006f30 00000000
	GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000005
	GPR24: c0c67d74 c0c67f1c c0c60000 c0c67d70 c0c0c558 1efdf000 c0c00020 00000000
	NIP [c0a04110] topology_init+0x8c/0x138
	LR [c0a040d8] topology_init+0x54/0x138
	Call Trace:
	[e100de60] [80808080] 0x80808080 (unreliable)
	[e100de90] [c0006bd4] do_one_initcall+0x48/0x1bc
	[e100def0] [c0a0150c] kernel_init_freeable+0x1c8/0x278
	[e100df20] [c0006f44] kernel_init+0x14/0x10c
	[e100df30] [c00190fc] ret_from_kernel_thread+0x14/0x1c
	Instruction dump:
	7c692e70 7d290194 7c035040 7c7f1b78 5529103a 546706fe 5468103a 39400001
	7c641b78 40800054 80c690b4 7fb9402e <81060034> 7fbeea14 2c080000 7fa3eb78
	---[ end trace b246ffbc6bbbb6fb ]---

Fix it by checking smp_ops before using it, as already done in
several other places in the arch/powerpc/kernel/smp.c

Fixes: 39f8756145 ("powerpc/smp: Move ppc_md.cpu_die() to smp_ops.cpu_offline_self()")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/75287841cbb8740edd44880fe60be66d489160d9.1628097995.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-08-18 08:59:17 +02:00
..
boot powerpc/boot: Fixup device-tree on little endian 2021-07-20 16:05:45 +02:00
configs powerpc updates for 5.10 2020-10-16 12:21:15 -07:00
crypto crypto: powerpc/crc-vpmsum_test - Fix sparse endianness warning 2020-09-04 17:57:15 +10:00
include powerpc/ps3: Add dma_mask to ps3_dma_region 2021-07-20 16:05:42 +02:00
kernel powerpc/smp: Fix OOPS in topology_init() 2021-08-18 08:59:17 +02:00
kexec powerpc/kexec_file: Use current CPU info while setting up FDT 2021-05-11 14:47:35 +02:00
kvm KVM: PPC: Book3S HV Nested: Sanitise H_ENTER_NESTED TM state 2021-07-28 14:35:43 +02:00
lib powerpc/64s: Fix crashes when toggling entry flush barrier 2021-05-19 10:13:10 +02:00
math-emu
mm powerpc/mm/book3s64: Fix possible build error 2021-07-20 16:05:43 +02:00
net bpf: Introduce BPF nospec instruction for mitigating Spectre v4 2021-08-04 12:46:44 +02:00
oprofile
perf powerpc/perf: Fix the threshold event selection for memory events in power10 2021-05-14 09:50:42 +02:00
platforms powerpc/pseries: Fix regression while building external modules 2021-08-04 12:46:45 +02:00
purgatory
sysdev powerpc/xive: Fix xmon command "dxi" 2021-05-14 09:50:38 +02:00
tools powerpc/tools: Remove 90 line limit in checkpatch script 2020-09-08 22:57:11 +10:00
xmon powerpc/xmon: Change printk() to pr_cont() 2020-12-30 11:54:16 +01:00
Kbuild
Kconfig powerpc: Fix HAVE_HARDLOCKUP_DETECTOR_ARCH build configuration 2021-05-14 09:50:31 +02:00
Kconfig.debug powerpc: iommu: fix build when neither PCI or IBMVIO is set 2021-05-14 09:50:34 +02:00
Makefile Kbuild fixes for v5.10 (2nd) 2020-12-06 10:31:39 -08:00
Makefile.postlink powerpc: unrel_branch_check.sh: use nm to find symbol value 2020-09-02 11:00:22 +10:00