From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: lkml@morethan.org, linux-kernel@vger.kernel.org
Subject: Re: [Compile Warning] 2.6.30-rc8 build
Date: Fri, 5 Jun 2009 23:06:41 +0100 [thread overview]
Message-ID: <20090605230641.2b3013c4@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20090605145756.ed566f48.akpm@linux-foundation.org>
> 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
next prev parent reply other threads:[~2009-06-05 22:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-05 16:43 Michael S. Zick
2009-06-05 17:22 ` Roland Dreier
2009-06-05 17:40 ` Michael S. Zick
2009-06-05 17:50 ` Roland Dreier
2009-06-05 18:06 ` Alan Cox
2009-06-05 18:01 ` Alan Cox
2009-06-05 21:57 ` Andrew Morton
2009-06-05 22:06 ` Alan Cox [this message]
2009-06-05 22:13 ` Andrew Morton
2009-06-05 16:50 Michael S. Zick
2009-06-05 17:28 ` Roland Dreier
2009-06-05 17:49 ` Michael S. Zick
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