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| author | Paul Mundt <lethal@linux-sh.org> | 2010-01-15 14:21:37 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-01-15 14:21:37 +0900 |
| commit | a6198a238baceae9d4e0ce3915f6d239c89b5c08 (patch) | |
| tree | 512b77781c1e4af78873f58a9bea8733aa06c117 /arch/sh/mm/cache.c | |
| parent | a09d2831b3457a92a58d67bddfed370516acfe28 (diff) | |
| download | op-kernel-dev-a6198a238baceae9d4e0ce3915f6d239c89b5c08.zip op-kernel-dev-a6198a238baceae9d4e0ce3915f6d239c89b5c08.tar.gz | |
sh: Guard against early IPIs in flush_cache_all().
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>
Diffstat (limited to 'arch/sh/mm/cache.c')
| -rw-r--r-- | arch/sh/mm/cache.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/arch/sh/mm/cache.c b/arch/sh/mm/cache.c index b8607fa..0f4095d 100644 --- a/arch/sh/mm/cache.c +++ b/arch/sh/mm/cache.c @@ -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(); } |
