linux-kernel - Re: [PATCH V2] include: linux: Regularise the use of FIELD

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Message-ID: <c3b83ba7f9b003dd4fb9cad885461ce93165dc04.camel@perches.com>
Date:   Sat, 29 Jun 2019 09:45:10 -0700
From:   Joe Perches <joe@...ches.com>
To:     Alexey Dobriyan <adobriyan@...il.com>,
        Andreas Dilger <adilger@...ger.ca>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shyam Saini <shyam.saini@...rulasolutions.com>,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        keescook@...omium.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        netdev@...r.kernel.org, linux-ext4 <linux-ext4@...r.kernel.org>,
        devel@...ts.orangefs.org, linux-mm@...ck.org,
        linux-sctp@...r.kernel.org, bpf@...r.kernel.org,
        kvm@...r.kernel.org, mayhs11saini@...il.com
Subject: Re: [PATCH V2] include: linux: Regularise the use of FIELD_SIZEOF
 macro

On Sat, 2019-06-29 at 17:25 +0300, Alexey Dobriyan wrote:
> On Tue, Jun 11, 2019 at 03:00:10PM -0600, Andreas Dilger wrote:
> > On Jun 11, 2019, at 2:48 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini <shyam.saini@...rulasolutions.com> wrote:
> > I did a check, and FIELD_SIZEOF() is used about 350x, while sizeof_field()
> > is about 30x, and SIZEOF_FIELD() is only about 5x.
> > 
> > That said, I'm much more in favour of "sizeof_field()" or "sizeof_member()"
> > than FIELD_SIZEOF().  Not only does that better match "offsetof()", with
> > which it is closely related, but is also closer to the original "sizeof()".
> > 
> > Since this is a rather trivial change, it can be split into a number of
> > patches to get approval/landing via subsystem maintainers, and there is no
> > huge urgency to remove the original macros until the users are gone.  It
> > would make sense to remove SIZEOF_FIELD() and sizeof_field() quickly so
> > they don't gain more users, and the remaining FIELD_SIZEOF() users can be
> > whittled away as the patches come through the maintainer trees.
> 
> The signature should be
> 
> 	sizeof_member(T, m)
> 
> it is proper English,
> it is lowercase, so is easier to type,
> it uses standard term (member, not field),
> it blends in with standard "sizeof" operator,

yes please.

Also, a simple script conversion applied
immediately after an rc1 might be easiest
rather than individual patches.