tree d28ad2b40830eec152d94030b2f75777f26dd869
parent 2c136efcf6f58d07512c4df83eb494597fe0d229
author Nick Piggin <npiggin@suse.de> 1159863244 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1159887846 -0700

[PATCH] sched: force /sbin/init off isolated cpus

Force /sbin/init off isolated cpus (unless every CPU is specified as an
isolcpu).

Users seem to think that the isolated CPUs shouldn't have much running on
them to begin with.  That's fair enough: intuitive, I guess.  It also means
that the cpu affinity masks of tasks will not include isolcpus by default,
which is also more intuitive, perhaps.

/sbin/init is spawned from the boot CPU's idle thread, and /sbin/init
starts the rest of userspace. So if the boot CPU is specified to be an
isolcpu, then prior to this patch, all of userspace will be run there.

(throw in a couple of plausible devinit -> cpuinit conversions I spotted
while we're here).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Acked-by: Paul Jackson <pj@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>