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x86: Fix dumpstack_64 irq stack handling 

Commit 2223f6f6ee "x86: Clean up dumpstack_64.c code" changed
the irq_stack processing a little from what it was before.
The irq_stack_end variable needed to be cleared after its first
use. By setting irq_stack to the per cpu irq_stack and passing
that to analyze_stack(), and then clearing it after it is processed,
we can get back the original behavior.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-04-02 13:26:41 -04:00 committed by Linus Torvalds
parent 1aabc5990d
commit 63c95654d8
1 changed files with 10 additions and 9 deletions
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19
arch/x86/kernel/dumpstack_64.c
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@ -116,9 +116,9 @@ enum stack_type {
static enum stack_type
analyze_stack(int cpu, struct task_struct *task, unsigned long *stack,
unsigned long **stack_end, unsigned *used, char **id)
unsigned long **stack_end, unsigned long *irq_stack,
unsigned *used, char **id)
{
unsigned long *irq_stack;
unsigned long addr;
addr = ((unsigned long)stack & (~(THREAD_SIZE - 1)));
@ -130,11 +130,11 @@ analyze_stack(int cpu, struct task_struct *task, unsigned long *stack,
if (*stack_end)
return STACK_IS_EXCEPTION;
*stack_end = (unsigned long *)per_cpu(irq_stack_ptr, cpu);
if (!*stack_end)
return STACK_IS_UNKNOWN;
if (!irq_stack)
return STACK_IS_NORMAL;
irq_stack = *stack_end - irq_stack_size;
*stack_end = irq_stack;
irq_stack = irq_stack - irq_stack_size;
if (in_irq_stack(stack, irq_stack, *stack_end))
return STACK_IS_IRQ;
@ -155,7 +155,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
{
const unsigned cpu = get_cpu();
struct thread_info *tinfo;
unsigned long *irq_stack;
unsigned long *irq_stack = (unsigned long *)per_cpu(irq_stack_ptr, cpu);
unsigned long dummy;
unsigned used = 0;
int graph = 0;
@ -186,7 +186,8 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
enum stack_type stype;
char *id;
stype = analyze_stack(cpu, task, stack, &stack_end, &used, &id);
stype = analyze_stack(cpu, task, stack, &stack_end,
irq_stack, &used, &id);
/* Default finish unless specified to continue */
done = 1;
@ -226,7 +227,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
* pointer (index -1 to end) in the IRQ stack:
*/
stack = (unsigned long *) (stack_end[-1]);
irq_stack = stack_end - irq_stack_size;
irq_stack = NULL;
ops->stack(data, "EOI");
done = 0;
break;