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MIPS: SMP: Allow boot_secondary SMP op to return errors

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Allow the boot_secondary SMP op to return an error to __cpu_up(), which
will in turn return it to its caller.

This will allow SMP implementations to return errors quickly in cases
they they know have failed, rather than relying upon __cpu_up()
eventually timing out waiting for the cpu_running completion.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/17014/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2017-08-12 19:49:40 -07:00
committed by Ralf Baechle
parent 68923cdc2e
commit d595d423d0
14 changed files with 37 additions and 15 deletions
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6
arch/mips/kernel/smp.c
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@@ -439,7 +439,11 @@ void smp_prepare_boot_cpu(void)
int __cpu_up(unsigned int cpu, struct task_struct *tidle)
{
mp_ops->boot_secondary(cpu, tidle);
int err;
err = mp_ops->boot_secondary(cpu, tidle);
if (err)
return err;
/*
* We must check for timeout here, as the CPU will not be marked