From: H. Peter Anvin <hpa@linux.intel.com>
Date: Sat, 31 Aug 2013 00:29:29 +0000 (-0700)
Subject: x86-32, ftrace: Fix static ftrace when early microcode is enabled
X-Git-Tag: v3.12-rc1~79^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af058ab04d3d11383e5159132fc78a3700be3af5;p=pandora-kernel.git

x86-32, ftrace: Fix static ftrace when early microcode is enabled

Early microcode loading runs C code before paging is enabled on 32
bits.  Since ftrace puts a hook into every function, that hook needs
to be safe to execute in the pre-paging environment.  This is
currently true for dynamic ftrace but not for static ftrace.

Static ftrace is obsolescent and assumed to not be
performance-critical, so we can simply test that the stack pointer
falls within the valid range of kernel addresses.

Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

Reading git-diff-tree failed