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[POWERPC] Move to runtime allocated exception stacks

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For the additonal exception levels (critical, debug, machine check) on
40x/book-e we were using "static" allocations of the stack in the
associated head.S.

Move to a runtime allocation to make the code a bit easier to read as
we mimic how we handle IRQ stacks.  Its also a bit easier to setup the
stack with a "dummy" thread_info in C code.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala
2008-04-30 03:49:55 -05:00
parent c054065bc1
commit bcf0b08807
7 changed files with 85 additions and 50 deletions
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33
arch/powerpc/kernel/irq.c
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@@ -356,9 +356,42 @@ void __init init_IRQ(void)
{
if (ppc_md.init_IRQ)
ppc_md.init_IRQ();
exc_lvl_ctx_init();
irq_ctx_init();
}
#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
struct thread_info *critirq_ctx[NR_CPUS] __read_mostly;
struct thread_info *dbgirq_ctx[NR_CPUS] __read_mostly;
struct thread_info *mcheckirq_ctx[NR_CPUS] __read_mostly;
void exc_lvl_ctx_init(void)
{
struct thread_info *tp;
int i;
for_each_possible_cpu(i) {
memset((void *)critirq_ctx[i], 0, THREAD_SIZE);
tp = critirq_ctx[i];
tp->cpu = i;
tp->preempt_count = 0;
#ifdef CONFIG_BOOKE
memset((void *)dbgirq_ctx[i], 0, THREAD_SIZE);
tp = dbgirq_ctx[i];
tp->cpu = i;
tp->preempt_count = 0;
memset((void *)mcheckirq_ctx[i], 0, THREAD_SIZE);
tp = mcheckirq_ctx[i];
tp->cpu = i;
tp->preempt_count = HARDIRQ_OFFSET;
#endif
}
}
#endif
#ifdef CONFIG_IRQSTACKS
struct thread_info *softirq_ctx[NR_CPUS] __read_mostly;