linux-kernel - Re: Must check what?

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Message-Id: <200610041358.36515.vlobanov@speakeasy.net>
Date:	Wed, 4 Oct 2006 13:58:36 -0700
From:	Vadim Lobanov <vlobanov@...akeasy.net>
To:	Andrew Morton <akpm@...l.org>
Cc:	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org
Subject: Re: Must check what?

On Wednesday 04 October 2006 12:43, Andrew Morton wrote:
> > > It should have a slot for documenting caller-provided locking
> > > requirements too.  And for permissible calling-contexts.  They're all
> > > part of the caller-provided environment, and these two tend to be a
> > > heck of a lot more subtle than the function's formal arguments.
> >
> > Indeed.  And reference count assumptions.  It's almost like we want a
> > pre-condition assertion ...
>
> We have might_sleep(), assert_spin_locked(), BUG_ON(!irqs_disabled()), etc.
>
> I like assertions personally.  If we had something like:
>
> void foo(args)
> {
> 	locals;
>
> 	assert_irqs_enabled();
> 	assert_spin_locked(some_lock);
> 	assert_in_atomic();
> 	assert_mutex_locked(some_mutex);
>
> then we get documentation which is (optionally) checked at runtime - best
> of both worlds.  Better than doing it in kernel-doc.  Automatically
> self-updating (otherwise kernels go BUG).

Uhoh! How much is that going to hurt runtime? :) It actually seems to me like 
this should be doable by static code analysis tools without terribly much 
pain (in the relative sense of the term). Or am I wrong on this thought?

> And we still need to document those return values in English.

Definitely.

-- Vadim Lobanov
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