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x86/smp: Replace cpu_up/down() with add/remove_cpu()

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The core device API performs extra housekeeping bits that are missing
from directly calling cpu_up/down().

See commit a6717c01dd ("powerpc/rtas: use device model APIs and
serialization during LPM") for an example description of what might go
wrong.

This also prepares to make cpu_up/down() a private interface of the CPU
subsystem.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200323135110.30522-10-qais.yousef@arm.com
This commit is contained in:
Qais Yousef
2020-03-23 13:51:02 +00:00
committed by Thomas Gleixner
parent e646ac5bb8
commit af7aa04683
3 changed files with 9 additions and 19 deletions
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2
arch/x86/xen/smp.c
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@@ -132,7 +132,7 @@ void __init xen_smp_cpus_done(unsigned int max_cpus)
if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
continue;
rc = cpu_down(cpu);
rc = remove_cpu(cpu);
if (rc == 0) {
/*