On 01/21/16 10:34, Borislav Petkov wrote:
> From: Borislav Petkov <[email protected]>
>
> Add .altinstr_aux for additional instructions which will be used before
> and/or during patching. All stuff which needs more sophisticated
> patching should go there. See next patch.
>
> Signed-off-by: Borislav Petkov <[email protected]>
> ---
> arch/x86/kernel/vmlinux.lds.S | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
> index 74e4bf11f562..1335ff4854ae 100644
> --- a/arch/x86/kernel/vmlinux.lds.S
> +++ b/arch/x86/kernel/vmlinux.lds.S
> @@ -244,6 +244,15 @@ SECTIONS
> */
> .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
> *(.altinstr_replacement)
> + /*
> + * Section for code used exclusively before alternatives are
> + * run. All references to such code must be patched out by
> + * alternatives, normally by using a patch with
> + * X86_FEATURE_ALWAYS.
> + *
> + * See static_cpu_has() for an example.
> + */
> + *(.altinstr_aux)
> }
NAK on this being part of .altinstr_replacement (if anything it ought to
simply be part of .text.init). Otherwise fine.
-hpa
