linux-kernel - Re: [PATCH 01/31] bitops: add parity functions

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Message-ID: <56F3A77D.6060802@redhat.com>
Date:	Thu, 24 Mar 2016 09:38:21 +0100
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Martin Kepplinger <martink@...teo.de>,
	Sasha Levin <sasha.levin@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Yury Norov <yury.norov@...il.com>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 01/31] bitops: add parity functions

On 03/24/2016 04:03 AM, Zhaoxiu Zeng wrote:
> +/*
> + * Type invariant interface to the compile time constant parity functions.
> + */
> +#define PARITY(w)    PARITY64((u64)w)

Can result in incorrect expansion of w. Should be PARITY64((u64)(w))