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Commit 0da938c4 authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
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sched: Check if lowest_mask is initialized in find_lowest_rq()



On system boot up, the lowest_mask is initialized with an
early_initcall(). But RT tasks may wake up on other
early_initcall() callers before the lowest_mask is initialized,
causing a system crash.

Commit "d72bce0e rcu: Cure load woes" was the first commit
to wake up RT tasks in early init. Before this commit this bug
should not happen.

Reported-by: default avatarAndrew Theurer <habanero@linux.vnet.ibm.com>
Tested-by: default avatarAndrew Theurer <habanero@linux.vnet.ibm.com>
Tested-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20110614223657.824872966@goodmis.org


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8dd0de8b
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