linux-kernel - Re: [PATCH V2] sparse: Allow override of sizeof(bool) warning

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Message-ID: <20140227152435.GA7982@thunk.org>
Date:	Thu, 27 Feb 2014 10:24:35 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Borislav Petkov <bp@...en8.de>, Joe Perches <joe@...ches.com>,
	Ben Pfaff <blp@...ira.com>,
	Christopher Li <sparse@...isli.org>,
	Josh Triplett <josh@...htriplett.org>,
	linux-sparse@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] sparse: Allow override of sizeof(bool) warning

On Thu, Feb 27, 2014 at 07:10:25AM -0800, H. Peter Anvin wrote:
> Keep in mind, too, that for the kernel we don't care about the full
> C standard but a subset.  We rely on extrastandard behavior all over
> the place.  For all ABIs supported by the kernel, sizeof(_Book) == 1
> and so everything is sane.

Do we have a fairly comprehensive list of what these extrastandard
requirements / assumptions are?  It might be a good idea to have one
that we can point to, so that (a) people who are trying to define a
new architecture knows what they need to handle, (b) and so we can
give a list of things that static code analyzers like smatch and
coverity and sparse should be able to suppress (perhaps in a Linux
kernel-only mode).

					- Ted
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