From: H. Peter Anvin <hpa@zytor.com>
Date: Tue, 25 Aug 2009 23:47:16 +0000 (-0700)
Subject: x86: allow "=rm" in native_save_fl()
X-Git-Tag: v2.6.32-rc1~714^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab94fcf528d127fcb490175512a8910f37e5b346;p=pandora-kernel.git

x86: allow "=rm" in native_save_fl()

This is a partial revert of f1f029c7bfbf4ee1918b90a431ab823bed812504.

"=rm" is allowed in this context, because "pop" is explicitly defined
to adjust the stack pointer *before* it evaluates its effective
address, if it has one.  Thus, we do end up writing to the correct
address even if we use an on-stack memory argument.

The original reporter for f1f029c7bfbf4ee1918b90a431ab823bed812504 was
apparently using a broken x86 simulator.

[ Impact: performance ]

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Gabe Black <spamforgabe@umich.edu>
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