From: H. Peter Anvin <hpa@linux.intel.com>
Date: Fri, 21 Sep 2012 19:43:15 +0000 (-0700)
Subject: x86, smap: Reduce the SMAP overhead for signal handling
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~68^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e88353d8b5f483bc1c873ad24ac2b59a6b66c73;p=pandora-kernel.git

x86, smap: Reduce the SMAP overhead for signal handling

Signal handling contains a bunch of accesses to individual user space
items, which causes an excessive number of STAC and CLAC
instructions.  Instead, let get/put_user_try ... get/put_user_catch()
contain the STAC and CLAC instructions.

This means that get/put_user_try no longer nests, and furthermore that
it is no longer legal to use user space access functions other than
__get/put_user_ex() inside those blocks.  However, these macros are
x86-specific anyway and are only used in the signal-handling paths; a
simple reordering of moving the larger subroutine calls out of the
try...catch blocks resolves that problem.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-12-git-send-email-hpa@linux.intel.com
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