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alpha: Fix preemption handling in idle loop

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cpu_idle() is called on the boot CPU by the init code with
preemption disabled. But the cpu_idle() function in alpha
doesn't handle this when it calls schedule() directly.

Fix it by converting it into schedule_preempt_disabled().

Also disable preemption before calling cpu_idle() from
secondary CPU entry code to stay consistent with this
state.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Tested-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: alpha <linux-alpha@vger.kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
This commit is contained in:
Frederic Weisbecker 2012-08-23 14:11:25 +02:00 committed by Paul E. McKenney
parent a10d206ef1
commit 6a6c0272f1
2 changed files with 3 additions and 1 deletions
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3
arch/alpha/kernel/process.c
View File

@ -56,7 +56,8 @@ cpu_idle(void)
while (!need_resched())
cpu_relax();
schedule();
schedule_preempt_disabled();
}
}

1
arch/alpha/kernel/smp.c
View File

@ -166,6 +166,7 @@ smp_callin(void)
DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n",
cpuid, current, current->active_mm));
preempt_disable();
/* Do nothing. */
cpu_idle();
}