[PATCH v5 3/6] arm64: Add framework for legacy instruction emulation

[Greg Hackmann]

If it's not too late to chime in, I ran across one issue testing this patchset:

On Tue, Nov 18, 2014 at 3:41 AM, Punit Agrawal <punit.agrawal at arm.com> wrote:
> +       ret = update_insn_emulation_mode(insn, prev_mode);
> +       if (!ret) {
> +               /* Mode change failed, revert to previous mode. */
> +               insn->current_mode = prev_mode;
> +               update_insn_emulation_mode(insn, INSN_UNDEF);
> +       }

update_insn_emulation_mode() returns 0 on success, so the condition
needs to be "if (ret)".  Otherwise writes to the sysctl file are
immediately rolled back.