From a343c75d338aa2afaea4a2a8e40de9e67b6fb4a7 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Mon, 12 Oct 2009 14:11:09 -0700
Subject: [PATCH] x86: use kernel_stack_pointer() in dumpstack.c

The way to obtain a kernel-mode stack pointer from a struct pt_regs in
32-bit mode is "subtle": the stack doesn't actually contain the stack
pointer, but rather the location where it would have been marks the
actual previous stack frame.  For clarity, use kernel_stack_pointer()
instead of coding this weirdness explicitly.

Furthermore, user_mode() is only valid when the process is known to
not run in V86 mode.  Use the safer user_mode_vm() instead.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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