linux-kernel - Re: [PATCH 3/8] arch/x86: Remove sentinel elem from ctl

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Message-ID: <ZPj2F4retSgg3vAj@gmail.com>
Date:   Wed, 6 Sep 2023 23:58:47 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     j.granados@...sung.com, Luis Chamberlain <mcgrof@...nel.org>,
        willy@...radead.org, josh@...htriplett.org,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Guo Ren <guoren@...nel.org>, linux-fsdevel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        linux-ia64@...r.kernel.org, linux-csky@...r.kernel.org
Subject: Re: [PATCH 3/8] arch/x86: Remove sentinel elem from ctl_table arrays


* Dave Hansen <dave.hansen@...el.com> wrote:

> On 9/6/23 03:03, Joel Granados via B4 Relay wrote:
> > This commit comes at the tail end of a greater effort to remove the
> > empty elements at the end of the ctl_table arrays (sentinels) which
> > will reduce the overall build time size of the kernel and run time
> > memory bloat by ~64 bytes per sentinel (further information Link :
> > https://lore.kernel.org/all/ZO5Yx5JFogGi%2FcBo@bombadil.infradead.org/)
> > 
> > Remove sentinel element from sld_sysctl and itmt_kern_table.
> 
> There's a *LOT* of content to read for a reviewer to figure out what's
> going on here between all the links.  I would have appreciated one more
> sentence here, maybe:
> 
> 	This is now safe because the sysctl registration code
> 	(register_sysctl()) implicitly uses ARRAY_SIZE() in addition
> 	to checking for a sentinel.
> 
> That needs to be more prominent _somewhere_.  Maybe here, or maybe in
> the cover letter, but _somewhere_.
> 
> That said, feel free to add this to the two x86 patches:
> 
> Acked-by: Dave Hansen <dave.hansen@...ux.intel.com> # for x86

Absolutely needs to be in the title as well, something like:

   arch/x86: Remove now superfluous sentinel elem from ctl_table arrays

With that propagated into the whole series:

   Reviewed-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo