linux-kernel - Re: [PATCH 6/7] Add /sys/kernel/notes

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Message-Id: <20070712003719.A803E4D0555@magilla.localdomain>
Date:	Wed, 11 Jul 2007 17:37:19 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] Add /sys/kernel/notes

> I'm curios to know what happens if nobody defines __start_notes and
> __end_notes.  We'll use the extern-attribute-weak thing, but those two
> locations won't even get instantiated in vmlinux, I think.
> 
> And the code relies upon the difference between two non-existent
> attribute-weak locations being zero.

The well-defined meaning of weak externs is that they resolve to zero if
undefined.  It relies on zero-zero being zero.  It relies on noone defining
one of __start_notes and __stop_notes but not both.


Thanks,
Roland
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