From: Hugh Dickins <hughd@google.com>
Date: Fri, 23 Mar 2012 21:02:55 +0000 (-0700)
Subject: x86: Stop recursive fault in print_context_stack after stack overflow
X-Git-Tag: v3.4-rc1~43^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65c0ff4079c011232e795e62c74a0a95512b7ac3;p=pandora-kernel.git

x86: Stop recursive fault in print_context_stack after stack overflow

After printing out the first line of a stack backtrace,
print_context_stack() calls print_ftrace_graph_addr() to check
if it's making a graph of function calls, usually not the case.

But unfortunate ordering of assignments causes this to oops if
an earlier stack overflow corrupted threadinfo->task.  Reorder
to avoid that irritation.

( The fact that there was a stack overflow may often be more
  interesting than the stack that can now be shown; but
  integrating that information with this stacktrace is awkward,
  so leave it to overflow reporting. )

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20120323225648.15DD5A033B@akpm.mtv.corp.google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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