linux-kernel - Re: [PATCH v3 1/4] array_size.h: Add ARRAY

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Message-ID: <amjs73mcxeq2zcni5rkbbugm7jgboejrtk6qxfov76hr2fca6m@zjdljyhkkaqs>
Date: Sun, 9 Nov 2025 20:18:41 +0100
From: Alejandro Colomar <alx@...nel.org>
To: "Maciej W. Rozycki" <macro@...am.me.uk>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	Kees Cook <kees@...nel.org>, Christopher Bazley <chris.bazley.wg14@...il.com>, 
	Rasmus Villemoes <linux@...musvillemoes.dk>, Marco Elver <elver@...gle.com>, Michal Hocko <mhocko@...e.com>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Alexander Potapenko <glider@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Jann Horn <jannh@...gle.com>, 
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 1/4] array_size.h: Add ARRAY_END()

Hi Maciej,

On Sun, Nov 09, 2025 at 07:05:40PM +0000, Maciej W. Rozycki wrote:
> On Sun, 9 Nov 2025, Alejandro Colomar wrote:
> 
> > diff --git a/include/linux/array_size.h b/include/linux/array_size.h
> > index 06d7d83196ca..b5775b8f13de 100644
> > --- a/include/linux/array_size.h
> > +++ b/include/linux/array_size.h
> > @@ -10,4 +10,10 @@
> >   */
> >  #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
> >  
> > +/**
> > + * ARRAY_END - get a pointer to one past the last element in array @a
> > + * @a: array
> > + */
> > +#define ARRAY_END(a)  (&(a)[ARRAY_SIZE(a)])
> 
>  Why `a' rather than `arr' as with the other macro?

It's simpler, and equally informative.  I wish ARRAY_SIZE() would have
also used 'a'.  On the other hand, consistency is important.  I'll make
it 'arr'.

Thanks!


Have a lovely night!
Alex


> 
>   Maciej

-- 
<https://www.alejandro-colomar.es>
Use port 80 (that is, <...:80/>).

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