linux-kernel - Re: [PATCH 2/2] kbuild: Disable CONFIG_LD_ORPHAN

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Message-ID: <202011171350.F95127F@keescook>
Date:   Tue, 17 Nov 2020 13:51:43 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Nick Desaulniers <ndesaulniers@...gle.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, clang-built-linux@...glegroups.com,
        "kernelci . org bot" <bot@...nelci.org>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 2/2] kbuild: Disable CONFIG_LD_ORPHAN_WARN for ld.lld
 10.0.1

On Fri, Nov 13, 2020 at 12:55:53PM -0700, Nathan Chancellor wrote:
>  config LD_ORPHAN_WARN
> -	def_bool ARCH_WANT_LD_ORPHAN_WARN && $(ld-option,--orphan-handling=warn)
> +	def_bool ARCH_WANT_LD_ORPHAN_WARN && $(ld-option,--orphan-handling=warn) && (!LD_IS_LLD || LLD_VERSION >= 110000)

Readability nit-pick... I prefer separate "depends" lines to make things
a little easier to parse, change, etc:

config LD_ORPHAN_WARN
	def_bool y
	depends on ARCH_WANT_LD_ORPHAN_WARN
	depends on !LD_IS_LLD || LLD_VERSION >= 110000
	depends on $(ld-option,--orphan-handling=warn)

Otherwise, yeah, looks good to me. With this and the other suggestions,
please consider it:

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

-- 
Kees Cook