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

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Message-ID: <20230907082446.a4o46vka2vtes3h4@localhost>
Date:   Thu, 7 Sep 2023 10:24:46 +0200
From:   Joel Granados <j.granados@...sung.com>
To:     Ingo Molnar <mingo@...nel.org>
CC:     Dave Hansen <dave.hansen@...el.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

On Wed, Sep 06, 2023 at 11:58:47PM +0200, Ingo Molnar wrote:
> 
> * 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
Done. Will wait to see if other ppl have more comments to send out V2

Thx.
> 
> With that propagated into the whole series:
> 
>    Reviewed-by: Ingo Molnar <mingo@...nel.org>
> 
> Thanks,
> 
> 	Ingo

-- 

Joel Granados

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