From 6471fbc6eb71dd615075f58576ad813697700873 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Sun, 14 Oct 2012 17:59:40 -0700
Subject: [PATCH] sparc64: Like x86 we should check current->mm during perf
 backtrace generation.

[ Upstream commit 08280e6c4c2e8049ac61d9e8e3536ec1df629c0d ]

If the MM is not active, only report the top-level PC.  Do not try to
access the address space.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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Reading git-format-patch failed