netdev - RE: [PATCH 03/15] batman-adv: add biggest_unsigned

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B6EF4@saturn3.aculab.com>
Date:	Wed, 25 Apr 2012 15:57:39 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"David Laight" <David.Laight@...LAB.COM>,
	"Antonio Quartulli" <ordex@...istici.org>, <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>, <b.a.t.m.a.n@...ts.open-mesh.org>
Subject: RE: [PATCH 03/15] batman-adv: add biggest_unsigned_int(x) macro

 
> > +/* Returns the biggest unsigned integer with the sizeof x */
> > +#define biggest_unsigned_int(x) (~(x)0)
> 
> Nope - biggest_unsigned_int(unsigned char) is probably 0xffffffff

To correct myself, it is actually ((int)(-1)) (ie a signed value).

	David


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