linux-kernel - Re: [PATCH 3/7] Add assertion checking macros

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Date:	Tue, 20 Dec 2011 15:38:05 +0000
From:	David Howells <dhowells@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	dhowells@...hat.com, linux-arch@...r.kernel.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] Add assertion checking macros

Andi Kleen <andi@...stfloor.org> wrote:

> David Howells <dhowells@...hat.com> writes:
> >
> >      There is no need to display val here in the case the expression fails
> >      since it can only be 0.  If this fails, it produces an error like the
> >      following:
> >
> > 	------------[ cut here ]------------
> > 	kernel BUG at fs/fscache/main.c:109!
> > 	ASSERTION FAILED
> 
> It would be nice to display the expression here like an user space
> assert. While it can be looked up in the source it would
> make quick eyeballing easier. 
> 
> Probably wouldn't cost too much additional text size?

It can easily be made selectable.  I don't think text size should be much of
an issue - but it will also add a bunch of strings (preprocessed expressions)
to the rodata, and I'm not sure how big those can get - particularly if
they've got nested macros within (test_bit() for example).

David
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