linux-kernel - Re: [PATCH] [RFC] arm64: enable HAVE_LD_DEAD_CODE_DATA

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Message-ID: <20210317143757.GD12269@arm.com>
Date:   Wed, 17 Mar 2021 14:37:57 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Will Deacon <will@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Mark Brown <broonie@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Ionela Voinescu <ionela.voinescu@....com>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Scull <ascull@...gle.com>,
        David Brazdil <dbrazdil@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] [RFC] arm64: enable HAVE_LD_DEAD_CODE_DATA_ELIMINATION

On Thu, Feb 25, 2021 at 12:20:56PM +0100, Arnd Bergmann wrote:
> diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
> index bad2b9eaab22..926cdb597a45 100644
> --- a/arch/arm64/kernel/vmlinux.lds.S
> +++ b/arch/arm64/kernel/vmlinux.lds.S
> @@ -217,7 +217,7 @@ SECTIONS
>  		INIT_CALLS
>  		CON_INITCALL
>  		INIT_RAM_FS
> -		*(.init.altinstructions .init.bss .init.bss.*)	/* from the EFI stub */
> +		*(.init.altinstructions .init.data.* .init.bss .init.bss.*)	/* from the EFI stub */

INIT_DATA already covers .init.data and .init.data.*, so I don't think
we need this change.

Also, mainline doesn't have .init.bss.*, do you know where this came
from? I can't find it in -next either.

-- 
Catalin