linux-kernel - Re: [PATCH] Fix an uninitialised variable warning in the 8250 driver

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Message-ID: <20081114190149.7f5c20f2@lxorguk.ukuu.org.uk>
Date:	Fri, 14 Nov 2008 19:01:49 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Howells <dhowells@...hat.com>
Cc:	dhowells@...hat.com, linux-serial@...r.kernel.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix an uninitialised variable warning in the 8250
 driver

On Fri, 14 Nov 2008 16:51:08 +0000
David Howells <dhowells@...hat.com> wrote:

> Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
> > Current versions of gcc that I've tested get this all correct just fine
> > for x86 at least.
> 
> gcc version 4.1.2 20070925 (Red Hat 4.1.2-33)

Newer gcc (4.3 and above) gets it right.

> x86_64 - which doesn't do that.  It uses asm volatile and an infinite for-loop.

Which it seems 4.3 knows about

> Surely having BUG() retreat through a noreturn function may lose important
> state, such as the function that issued the bug as the compiler is under no
> requirement to save the return value, and the file/line info may not be
> available.

Its arch specific code so arch specific things can be done.

Alan
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