[PATCH] powerpc: fix /proc/self/stack

From	Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Newsgroups	linux.kernel
Subject	[PATCH] powerpc: fix /proc/self/stack
Date	2017-03-17 17:00 +0100
Message-ID	<tm2sh-kO-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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.

This is also consistent with some other architectures.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
---
 arch/powerpc/kernel/stacktrace.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c
index 6671195..2446066 100644
--- a/arch/powerpc/kernel/stacktrace.c
+++ b/arch/powerpc/kernel/stacktrace.c
@@ -59,7 +59,12 @@ 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 = tsk->thread.ksp;
+
+	if (tsk == current)
+		sp = current_stack_pointer();
+
+	save_context_stack(trace, sp, tsk, 0);
 }
 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
 
-- 
2.9.3

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[PATCH] powerpc: fix /proc/self/stack Thadeu Lima de Souza Cascardo <cascardo@canonical.com> - 2017-03-17 17:00 +0100
  Re: [PATCH] powerpc: fix /proc/self/stack Michael Ellerman <mpe@ellerman.id.au> - 2017-03-22 12:20 +0100

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