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

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Date:	Sat, 25 Nov 2006 14:56:22 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	David Miller <davem@...emloft.net>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org,
	openib-general@...nib.org, tom@...ngridcomputing.com
Subject: Re: [PATCH] Avoid truncating to 'long' in ALIGN() macro

 > Perhaps a better way to fix this is to use
 > typeof() like other similar macros do.

I tried doing

#define ALIGN(x,a)				\
	({					\
		typeof(x) _a = (a);		\
		((x) + _a - 1) & ~(_a - 1);	\
	})

but that won't compile because of <net/neighbour.h>:

	unsigned char		ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];

gcc says:

/scratch/Ksrc/linux-merge/include/net/neighbour.h:104: error: braced-group within expression allowed only inside a function

I guess that could be fixed by changing that declaration but now this
is starting to feel like early 2.6.20 material.

 - R.
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