netdev - Re: [PATCH] rtnl: Simplify ASSERT

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Date:	Thu, 11 Oct 2007 16:28:45 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] rtnl: Simplify ASSERT_RTNL

On Thu, Oct 11, 2007 at 02:23:35AM -0600, Eric W. Biederman wrote:
>
> > So I would object to a patch that caused the RTNL_ASSERT to not
> > warn about being called in an atomic context.
> 
> ASSERT_RTNL does not warn about being called in an atomic context
> today!

Well it did didn't it or we wouldn't be having this thread :)
 
> Way way deep in mutex debugging on the slowpath there is a unreadable
> and incomprehensible WARN_ON in muxtex_trylock that will trigger if
> you have 10 tons of debugging turned on, and you are in,
> interrupt context, and you manage to hit the slow path.  I think that
> is a pretty unlikely scenario.

Well thanks to that warning we're on our way of improving the
code that triggered it in such a way that this warning will soon
go silent.

That's precisely the reason why I object to having this warning
removed.  Now you have a good point that this warning doesn't
trigger all the time.  The fix to that is to *make* it trigger
always, not removing it.

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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