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powerpc: Make /proc/self/stack always print the current stack 

For the current task, the kernel stack would only tell the last time the
process was rescheduled, if ever. Use the current stack pointer for the
current task.

Otherwise, every once in a while, the stacktrace printed when reading
/proc/self/stack would look like the process is running in userspace,
while it's not, which some may consider as a bug.

This is also consistent with some other architectures, like x86 and arm,
at least.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2017-03-27 16:32:33 -03:00 committed by Michael Ellerman
parent 5511a45fc1
commit 4f9b514b76
1 changed files with 8 additions and 1 deletions
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9
arch/powerpc/kernel/stacktrace.c
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@ -59,7 +59,14 @@ EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
save_context_stack(trace, tsk->thread.ksp, tsk, 0);
unsigned long sp;
if (tsk == current)
sp = current_stack_pointer();
else
sp = tsk->thread.ksp;
save_context_stack(trace, sp, tsk, 0);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);