tree 5f8c8069364c227d77c54c2e1bdc2f3b79a1b6a7
parent fdc6c1052bc7d89a5826904fbb4318677e8442ce
author Andy Lutomirski <luto@amacapital.net> 1416708031 -0800
committer Greg Hackmann <ghackmann@google.com> 1455063968 -0800

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>