linux-kernel - Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

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Message-ID: <adapsba2bvj.fsf@cisco.com>
Date:	Sun, 26 Nov 2006 12:26:08 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Andrew Morton <akpm@...l.org>, David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, openib-general@...nib.org,
	tom@...ngridcomputing.com, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

 > +#define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
 > +#define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))

Fine by me, but it loses the extra (typeof(x)) cast that Al wanted to
make sure that the result of ALIGN() is not wider than x.

 - R.
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