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powerpc/ppc32: Fix the bug in the init of non-base exception stack for UP 

We would allocate one specific exception stack for each kind of
non-base exceptions for every CPU. For ppc32 the CPU hard ID is
used as the subscript to get the specific exception stack for
one CPU. But for an UP kernel, there is only one element in the
each kind of exception stack array. We would get stuck if the
CPU hard ID is not equal to '0'. So in this case we should use the
subscript '0' no matter what the CPU hard ID is.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kevin Hao 2014-01-29 18:24:54 +08:00 committed by Benjamin Herrenschmidt
parent d2b496e5e1
commit 04a341138d
2 changed files with 10 additions and 0 deletions
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5
arch/powerpc/kernel/irq.c
View File

@ -559,8 +559,13 @@ void exc_lvl_ctx_init(void)
#ifdef CONFIG_PPC64
cpu_nr = i;
#else
#ifdef CONFIG_SMP
cpu_nr = get_hard_smp_processor_id(i);
#else
cpu_nr = 0;
#endif
#endif
memset((void *)critirq_ctx[cpu_nr], 0, THREAD_SIZE);
tp = critirq_ctx[cpu_nr];
tp->cpu = cpu_nr;

5
arch/powerpc/kernel/setup_32.c
View File

@ -247,7 +247,12 @@ static void __init exc_lvl_early_init(void)
/* interrupt stacks must be in lowmem, we get that for free on ppc32
* as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
for_each_possible_cpu(i) {
#ifdef CONFIG_SMP
hw_cpu = get_hard_smp_processor_id(i);
#else
hw_cpu = 0;
#endif
critirq_ctx[hw_cpu] = (struct thread_info *)
__va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
#ifdef CONFIG_BOOKE