Re: linux-next: manual merge of the tip tree with the kbuild tree

Josh Poimboeuf
2022-05-27T04:47:21Z

On Fri, May 27, 2022 at 11:19:02AM +0900, Masahiro Yamada wrote:
> [1] original behavior in Josh's commit
>
> $ git checkout 753da4179d08b625d8df72e97724e22749969fd3
> $ make defconfig
> $ make -j8 kernel/
> $ head -n 1 kernel/.fork.o.cmd
>
>
> I do not see the "--linked" parameter in the objtool command.
>
>
>
>
> [2] behavior in linux-next
>
>
> $ git checkout next-20220523
> $ make defconfig
> $ make -j8 kernel/
> $ head -n 1 kernel/.fork.o.cmd
>
> I see the "--linked" parameter in the objtool command.
>
> kernel/fork.o is a direct output from GCC,
> not from linker.

Yes, good catch. That flag should only be used for linked objects like
vmlinux.o or some_module.o.

Objtool only runs on such objects when CONFIG_LTO_CLANG,
CONFIG_X86_KERNEL_IBT, or CONFIG_NOINSTR_VALIDATION (vmlinux.o-only) is
enabled.

--
Josh