linux-kernel - Re: [PATCH v2] kbuild: Make $(LLVM) more flexible

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Date:   Fri, 4 Mar 2022 10:09:03 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shuah Khan <shuah@...nel.org>, llvm@...ts.linux.dev,
        linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2] kbuild: Make $(LLVM) more flexible

On Fri, Mar 04, 2022 at 10:08:14AM -0700, Nathan Chancellor wrote:
> [...]
> 
> Update and reorder the documentation to reflect these new additions.
> At the same time, notate that LLVM=0 is not the same as just omitting it
> altogether, which has confused people in the past.

Is it worth making LLVM=0 actually act the way it's expected to?

> Link: https://lore.kernel.org/r/20200317215515.226917-1-ndesaulniers@google.com/
> Link: https://lore.kernel.org/r/20220224151322.072632223@infradead.org/
> Suggested-by: Masahiro Yamada <masahiroy@...nel.org>
> Suggested-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Nathan Chancellor <nathan@...nel.org>

Looks good; minor .rst nit below...

Reviewed-by: Kees Cook <keescook@...omium.org>

> [...]
> -LLVM has substitutes for GNU binutils utilities. Kbuild supports ``LLVM=1``
> -to enable them. ::
> -
> -	make LLVM=1
> -
> -They can be enabled individually. The full list of the parameters: ::
> +LLVM has substitutes for GNU binutils utilities. They can be enabled individually.
> +The full list of supported make variables: ::

": ::" and "::" yield the same result. I think the latter is more
readable in non-rendered form. *shrug*

-Kees

-- 
Kees Cook