https://github.com/torvalds/linux
Revision 6667deb69ee3b8a31ea88e1303cf3ad7d4f221da authored by Maksim Rayskiy on 12 February 2011, 18:21:32 UTC, committed by Ralf Baechle on 14 March 2011, 20:07:27 UTC
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: Maksim Rayskiy <mrayskiy@broadcom.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2070/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent ba9786f
History
Tip revision: 6667deb69ee3b8a31ea88e1303cf3ad7d4f221da authored by Maksim Rayskiy on 12 February 2011, 18:21:32 UTC
MIPS: Move idle task creation to work queue
Tip revision: 6667deb
File Mode Size
Documentation
arch
block
crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 941 bytes
.mailmap -rw-r--r-- 4.0 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 91.7 KB
Kbuild -rw-r--r-- 2.4 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 187.2 KB
Makefile -rw-r--r-- 50.9 KB
README -rw-r--r-- 17.1 KB
REPORTING-BUGS -rw-r--r-- 3.3 KB

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