linux-kernel - Re: [PATCH v3 0/2] Stop some of the abuse of BUG() where compile time checks should be used.

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Message-ID: <CA+55aFx9x7Q0urXJHk7g2Fxqot0J=9YxaWcdmduwy=sm0DOduA@mail.gmail.com>
Date:	Thu, 24 Nov 2011 10:31:45 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	David Daney <ddaney.cavm@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	David Rientjes <rientjes@...gle.com>, DM <dm.n9107@...il.com>,
	David Daney <david.daney@...ium.com>,
	"Pinski, Andrew" <Andrew.Pinski@...iumnetworks.com>
Subject: Re: [PATCH v3 0/2] Stop some of the abuse of BUG() where compile time
 checks should be used.

On Thu, Nov 24, 2011 at 2:24 AM, David Howells <dhowells@...hat.com> wrote:
>
> Have you tried asking the gcc folks if this is likely to get fixed soon?

I actually don't think it's a bug. The error message is associated
with the function declaration symbol, so it actually makes sense that
there can be only one error message per callee - not per caller.

Using "__LINE__" to then create fairly unique symbols (modulo
#include, of course) gets around it in a pretty natural way as ddaney
said, so if we care enough.  I don't think it's a big issue (as
mentioned, I'd worry more about us making sure it's reliable enough to
be used - we've had gcc sometimes fail to compile things out just
because some optimization was not working well enough).

               Linus
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