diff options
| author |   Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-04-02 13:26:41 -0400 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-02 11:46:50 -0700 |
| commit | 63c95654d8256db8aed2a4699ad6eba359400ef8 (patch) | |
| tree | 33360aec89575c354bc7b086a2a0ad88f5ed9e51 /arch | |
| parent | x86: Fix dumpstack_64 to keep state of "used" variable in loop (diff) | |
| download | wireguard-linux-63c95654d8256db8aed2a4699ad6eba359400ef8.tar.xz wireguard-linux-63c95654d8256db8aed2a4699ad6eba359400ef8.zip | |
x86: Fix dumpstack_64 irq stack handling
Commit 2223f6f6eeaa "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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/dumpstack_64.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c index 74c262a9b9f1..1abcb50b48ae 100644 --- a/arch/x86/kernel/dumpstack_64.c +++ b/arch/x86/kernel/dumpstack_64.c @@ -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; |