[PATCH] x86_64: Save original IST values for checking stack addresses
The values in init_tss.ist[] can change when an IST event occurs. Save the original IST values for checking stack addresses when debugging or doing stack traces. Signed-off-by: Keith Owens <kaos@ocs.com.au> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -46,4 +46,9 @@ EXPORT_SYMBOL(init_task);
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*/
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DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_internodealigned_in_smp = INIT_TSS;
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/* Copies of the original ist values from the tss are only accessed during
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* debugging, no special alignment required.
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*/
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DEFINE_PER_CPU(struct orig_ist, orig_ist);
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#define ALIGN_TO_4K __attribute__((section(".data.init_task")))
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@ -189,6 +189,7 @@ void __cpuinit cpu_init (void)
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{
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int cpu = stack_smp_processor_id();
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struct tss_struct *t = &per_cpu(init_tss, cpu);
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struct orig_ist *orig_ist = &per_cpu(orig_ist, cpu);
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unsigned long v;
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char *estacks = NULL;
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struct task_struct *me;
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@ -256,7 +257,7 @@ void __cpuinit cpu_init (void)
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estacks += EXCEPTION_STKSZ;
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break;
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}
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t->ist[v] = (unsigned long)estacks;
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orig_ist->ist[v] = t->ist[v] = (unsigned long)estacks;
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}
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t->io_bitmap_base = offsetof(struct tss_struct, io_bitmap);
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@ -178,7 +178,7 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
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break;
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#endif
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default:
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end = per_cpu(init_tss, cpu).ist[k];
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end = per_cpu(orig_ist, cpu).ist[k];
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break;
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}
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/*
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@ -232,8 +232,14 @@ struct tss_struct {
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unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
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} __attribute__((packed)) ____cacheline_aligned;
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extern struct cpuinfo_x86 boot_cpu_data;
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DECLARE_PER_CPU(struct tss_struct,init_tss);
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/* Save the original ist values for checking stack pointers during debugging */
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struct orig_ist {
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unsigned long ist[7];
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};
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DECLARE_PER_CPU(struct orig_ist, orig_ist);
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#ifdef CONFIG_X86_VSMP
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#define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
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