linux-kernel - Re: [PATCH] introduce lower_32

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Message-ID: <ada63qtvg57.fsf@cisco.com>
Date:	Fri, 25 Jul 2008 13:54:28 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, joerg.roedel@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] introduce lower_32_bits() macro

 > There's some readability benefit.  Sometimes it is hard to understand
 > why some random open-coded cast was used.  But I seem to recall that
 > there was another reason why we decided we needed this.  I forget, and
 > so apparently did the changelog author ;)

The guy who added the macro explained it in a comment ;)

 * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
 * the "right shift count >= width of type" warning when that quantity is
 * 32-bits.

 - R.
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