From: Andy Lutomirski <luto@amacapital.net>
Date: Sun, 23 Nov 2014 02:00:31 +0000 (-0800)
Subject: x86_64, traps: Fix the espfix64 #DF fixup and rewrite it in C
X-Git-Tag: v3.2.65~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6ac298db86a1add225ca7e655176bb5249f9a9d;p=pandora-kernel.git

x86_64, traps: Fix the espfix64 #DF fixup and rewrite it in C

commit af726f21ed8af2cdaa4e93098dc211521218ae65 upstream.

There's nothing special enough about the espfix64 double fault fixup to
justify writing it in assembly.  Move it to C.

This also fixes a bug: if the double fault came from an IST stack, the
old asm code would return to a partially uninitialized stack frame.

Fixes: 3891a04aafd668686239349ea58f3314ea2af86b
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.2:
 - Keep using the paranoiderrorentry macro to generate the asm code
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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