linux-kernel - Re: powerpc: hv{cs, si}_close() both unsigned hp->count and hvcsd->open

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Date:	Sun, 30 Nov 2008 11:16:14 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	roel kluin <roel.kluin@...il.com>, benh@...nel.crashing.org,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: powerpc: hv{cs, si}_close() both unsigned hp->count and
 hvcsd->open_count cannot be negative

> Also, I don't see why those changes have anything to do with "unsigned
> things cannot be negative".  As long as those counts are never zero on
> entry to those code sections, the existing code is fine, and I believe
> that assertion can be maintained.  If you believe the code needs to
> defend against the possibility of a zero count on entry, that should
> have been explicitly stated in the patch description.

See the tty_port patches in -next - this is an argument about code which
ought eventually to go away replaced by standard helper functions.
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