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.
Signed-off-by: Andy Lutomirski <email@example.com>
Reviewed-by: Thomas Gleixner <firstname.lastname@example.org>
Signed-off-by: Linus Torvalds <email@example.com>
Signed-off-by: Greg Kroah-Hartman <firstname.lastname@example.org>
2 files changed