linux-kernel - Re: [PATCH] Make WARN_ON/WARN_ON_ONCE no-ops when CONFIG

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Date:	Sat, 15 Dec 2007 17:22:50 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Make WARN_ON/WARN_ON_ONCE no-ops when CONFIG_BUG is off


On Fri, 2007-12-14 at 12:02 -0600, Matt Mackall wrote:
> 
> I added CONFIG_BUG, and I think the current behavior is correct. As
> you've noticed, we have to evaluate condition, it may have
> side-effects. And if code does:
> 
>         /* this indicates a driver bug, report and fail gracefully */
>         if (WARN_ON(val == NULL))
>                 return -EFAULT;
> 
> ..we surely want it to continue returning -EFAULT, regardless of
> whether we log it, no? What use case did you have in mind?

I find such code totally distateful.

Ben.

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