From: James Morse james.morse@arm.com
mainline inclusion from mainline-v6.8-rc1 commit 0d122fb60046cd888877a6029cc23863d4a1b9e3 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8XMTL CVE: NA
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LoongArch provides its own arch_unregister_cpu(). This clears the hotpluggable flag, then unregisters the CPU.
It isn't necessary to clear the hotpluggable flag when unregistering a cpu. unregister_cpu() writes NULL to the percpu cpu_sys_devices pointer, meaning cpu_is_hotpluggable() will return false, as get_cpu_device() has returned NULL.
Remove arch_unregister_cpu() and use the __weak version.
Signed-off-by: James Morse james.morse@arm.com Reviewed-by: Jonathan Cameron Jonathan.Cameron@huawei.com Reviewed-by: Gavin Shan gshan@redhat.com Signed-off-by: "Russell King (Oracle)" rmk+kernel@armlinux.org.uk Reviewed-by: Thomas Gleixner tglx@linutronix.de Link: https://lore.kernel.org/r/E1r5R46-00Ct0A-GJ@rmk-PC.armlinux.org.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: liwei liwei728@huawei.com --- arch/loongarch/kernel/topology.c | 8 -------- 1 file changed, 8 deletions(-)
diff --git a/arch/loongarch/kernel/topology.c b/arch/loongarch/kernel/topology.c index 7dfb46c68f58..866c2c9ef6ab 100644 --- a/arch/loongarch/kernel/topology.c +++ b/arch/loongarch/kernel/topology.c @@ -18,12 +18,4 @@ int arch_register_cpu(int cpu) c->hotpluggable = !io_master(cpu); return register_cpu(c, cpu); } - -void arch_unregister_cpu(int cpu) -{ - struct cpu *c = &per_cpu(cpu_devices, cpu); - - c->hotpluggable = 0; - unregister_cpu(c); -} #endif