Re: [PATCH 12/27] kbuild: Defer running objtool to link time for all CFG features

Hi Josh,

On Thu, Aug 27, 2026 at 09:51:41PM -0700, Josh Poimboeuf wrote:
> diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
> index 9bac917e8b819..df1e3584883e6 100644
> --- a/scripts/Makefile.vmlinux_o
> +++ b/scripts/Makefile.vmlinux_o
> @@ -30,20 +30,12 @@ endif
>  # objtool for vmlinux.o
>  # ---------------------------------------------------------------------------
>  #
> -# For CONFIG_OBJTOOL_DEFERRED (IBT or LTO), objtool doesn't run on individual
> -# translation units.  Instead it runs on vmlinux.o.
> -#
> -# For !CONFIG_OBJTOOL_DEFERRED + CONFIG_NOINSTR_VALIDATION, it runs on both
> -# translation units and vmlinux.o, with the latter only used for noinstr/unret
> -# validation.
> +# For CONFIG_OBJTOOL_DEFERRED, objtool doesn't run on individual translation
> +# units.  Instead it runs on vmlinux.o.
>  
> -objtool-enabled := $(or $(CONFIG_OBJTOOL_DEFERRED),$(CONFIG_NOINSTR_VALIDATION))
> +objtool-enabled := $(CONFIG_OBJTOOL_DEFERRED)
>  
> -ifeq ($(CONFIG_OBJTOOL_DEFERRED),y)
>  vmlinux-objtool-args-y					+= $(objtool-args-y)
> -else
> -vmlinux-objtool-args-$(CONFIG_OBJTOOL_WERROR)		+= --werror

Did you mean to drop this line or did it accidentally get culled in
cleaning up the conditional statements?

> -endif
>  
>  vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION)	+= --noinstr \
>  							   $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)

-- 
Cheers,
Nathan