linux-kernel - Re: [RFC PATCH 23/33] subarch TLB support

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Message-ID: <20060718210058.GF2654@sequoia.sous-sol.org>
Date:	Tue, 18 Jul 2006 14:00:58 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	David Miller <davem@...emloft.net>
Cc:	chrisw@...s-sol.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org, xen-devel@...ts.xensource.com,
	jeremy@...p.org, ak@...e.de, akpm@...l.org, rusty@...tcorp.com.au,
	zach@...are.com, ian.pratt@...source.com,
	Christian.Limpach@...cam.ac.uk
Subject: Re: [RFC PATCH 23/33] subarch TLB support

* David Miller (davem@...emloft.net) wrote:
> From: Chris Wright <chrisw@...s-sol.org>
> Date: Tue, 18 Jul 2006 00:00:23 -0700
> 
> > +        BUG_ON(HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF) < 0);
> 
> Although it happens to work currently, I think we should get out of
> the habit of putting operations with wanted side effects into BUG_ON()
> calls.  The following is therefore more preferable:
> 
> 	ret = HYPERVISOR_mmuext_op(&op, 1, NULL, DOMID_SELF);
> 	BUG_ON(ret < 0);
> 
> If this were ASSERT() in userspace, turning off debugging at build
> time would make the evaluations inside of the macro never occur.  It
> is my opinion that BUG_ON() should behave similarly.

Good point, I'll clean those up.

thanks,
-chris
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