linux-kernel - Re: [Compile Warning] 2.6.30-rc8 build

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Message-ID: <20090605230641.2b3013c4@lxorguk.ukuu.org.uk>
Date:	Fri, 5 Jun 2009 23:06:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	lkml@...ethan.org, linux-kernel@...r.kernel.org
Subject: Re: [Compile Warning] 2.6.30-rc8 build

> I don't think there's any way in which gcc can deduce that h->first is
> non-zero on entry to that loop.  Even if it inlines
> serial_unlink_irq_chain() into serial8250_shutdown().

Why does it care ?

Suppose the list is empty, n is loaded with NULL

That follows the BUG_ON path which expands to include a function marked
as not returning

gcc is just rather smarter than your average cc



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