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[PATCH] x86-64: dump_trace() atomicity fix

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Fix

BUG: using smp_processor_id() in preemptible [00000001] code:

in backtracer on preemptible debug kernels.

Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>
This commit is contained in:
Andrew Morton 2006-12-07 02:14:02 +01:00 committed by Andi Kleen
parent bb0d977ed4
commit da68933e0a
1 changed files with 5 additions and 3 deletions
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8
arch/x86_64/kernel/traps.c
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@ -254,7 +254,7 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
unsigned long *stack,
struct stacktrace_ops *ops, void *data)
{
const unsigned cpu = smp_processor_id();
const unsigned cpu = get_cpu();
unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr;
unsigned used = 0;
struct thread_info *tinfo;
@ -286,11 +286,11 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
MSG("Leftover inexact backtrace:");
stack = (unsigned long *)UNW_SP(&info);
if (!stack)
return;
goto out;
} else
MSG("Full inexact backtrace again:");
} else if (call_trace >= 1)
return;
goto out;
else
MSG("Full inexact backtrace again:");
} else
@ -385,6 +385,8 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
tinfo = current_thread_info();
HANDLE_STACK (valid_stack_ptr(tinfo, stack));
#undef HANDLE_STACK
out:
put_cpu();
}
EXPORT_SYMBOL(dump_trace);