From: Al Viro <viro@ftp.linux.org.uk>
To: "Kok, Auke" <auke-jan.h.kok@intel.com>
Cc: Richard Knutsson <ricknu-0@student.ltu.se>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Josh Triplett <josh@freedesktop.org>
Subject: Re: generic bool and sparse errors?
Date: Wed, 6 Jun 2007 21:24:09 +0100 [thread overview]
Message-ID: <20070606202409.GY4095@ftp.linux.org.uk> (raw)
In-Reply-To: <46671668.4090805@intel.com>
On Wed, Jun 06, 2007 at 01:17:44PM -0700, Kok, Auke wrote:
> well the sparse warning is about signedness. Either sparse needs to "know"
> that bool is unsigned, or the kernel headers need to somehow make bool
> unsigned... the latter choice would come down to just that, but it doesn't
> look like a good idea to me either somehow.
sparse treats _Bool as 1-bit integer type. It's considerably more
complicated beast; for one thing (_Bool)2 is 1, not 0. For another,
several places make unpleasant assumptions that size in bits is a
multiple of bits_in_char. Which would be fine, but sparse has it
set to 1 for _Bool. With obvious results...
prev parent reply other threads:[~2007-06-06 20:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-06 18:29 generic bool and sparse errors? Kok, Auke
2007-06-06 19:00 ` Jeff Garzik
2007-06-06 19:19 ` Richard Knutsson
2007-06-06 20:17 ` Kok, Auke
2007-06-06 20:24 ` Al Viro [this message]
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