tree 763dcbb9bab4588640392226e06789bc688db565
parent a9f180345f5378ac87d80ed0bea55ba421d83859
author H. Peter Anvin <hpa@linux.intel.com> 1392305670 -0800
committer H. Peter Anvin <hpa@linux.intel.com> 1392306625 -0800

x86, smap: Don't enable SMAP if CONFIG_X86_SMAP is disabled

If SMAP support is not compiled into the kernel, don't enable SMAP in
CR4 -- in fact, we should clear it, because the kernel doesn't contain
the proper STAC/CLAC instructions for SMAP support.

Found by Fengguang Wu's test system.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Link: http://lkml.kernel.org/r/20140213124550.GA30497@localhost
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: <stable@vger.kernel.org> # v3.7+