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Commit 6667deb6 authored by Maksim Rayskiy's avatar Maksim Rayskiy Committed by Ralf Baechle
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MIPS: Move idle task creation to work queue



To avoid forking usermode thread when creating an idle task, move fork_idle
to a work queue.

If kernel starts with maxcpus= option which does not bring all available
cpus online at boot time, idle tasks for offline cpus are not created. If
later offline cpus are hotplugged through sysfs, __cpu_up is called in
the context of the user task, and fork_idle copies its non-zero mm
pointer.  This causes BUG() in per_cpu_trap_init.

This also avoids issues with resource limits of the CPU writing to sysfs,
containers, maybe others.

Signed-off-by: default avatarMaksim Rayskiy <mrayskiy@broadcom.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2070/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent ba9786f3
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