linux-kernel - Re: [PATCH 01/21] powerpc: Remove warning on array size when empty

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Date:   Sun, 25 Feb 2018 12:53:38 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
        Jiri Slaby <jslaby@...e.com>, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 01/21] powerpc: Remove warning on array size when empty

Hi!

On Sun, Feb 25, 2018 at 06:22:16PM +0100, Mathieu Malaterre wrote:
> When neither CONFIG_ALTIVEC, nor CONFIG_VSX or CONFIG_PPC64 is defined, the
> array feature_properties is defined as an empty array, which in turn
> triggers the following warning (treated as error on W=1):

> -	for (i = 0; i < ARRAY_SIZE(feature_properties); ++i, ++fp) {
> +	for (; fp != feature_properties + ARRAY_SIZE(feature_properties); ++fp) {

You could just write != instead of < ?  Seems more readable.

Maybe something can be done to ARRAY_SIZE to make this not warn.


Segher