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sh: Guard against early IPIs in flush_cache_all().

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flush_cache_all() gets called in to when we do some early ioremapping.
Unfortunately on SDK7786 the interrupt controller itself requires
ioremapping, leading to a bit of a chicken and egg scenario. For now,
don't bother with IPI crosscalls if there aren't any other CPUs online.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2010-01-15 14:21:37 +09:00
parent a09d2831b3
commit a6198a238b
1 changed files with 11 additions and 2 deletions
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13
arch/sh/mm/cache.c
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@ -2,7 +2,7 @@
* arch/sh/mm/cache.c
*
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
* Copyright (C) 2002 - 2009 Paul Mundt
* Copyright (C) 2002 - 2010 Paul Mundt
*
* Released under the terms of the GNU GPL v2.0.
*/
@ -41,8 +41,17 @@ static inline void cacheop_on_each_cpu(void (*func) (void *info), void *info,
int wait)
{
preempt_disable();
smp_call_function(func, info, wait);
/*
* It's possible that this gets called early on when IRQs are
* still disabled due to ioremapping by the boot CPU, so don't
* even attempt IPIs unless there are other CPUs online.
*/
if (num_online_cpus() > 1)
smp_call_function(func, info, wait);
func(info);
preempt_enable();
}