linux-kernel - Re: [RFC][PATCH] introduce ptr

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Date:	Thu, 19 Aug 2010 15:05:13 +0200
From:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Namhyung Kim <namhyung@...il.com>, Arnd Bergmann <arnd@...db.de>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] introduce ptr_diff()

On Don, 2010-08-19 at 14:59 +0200, Andi Kleen wrote:
> > If so, the warning seems valid as sizeof(struct page) is probably not
> > (always) a power of 2. On a native build on x86_64 it is 56 bytes
> > hereover.
> > Hmm ....
> 
> gcc just generats a mull with inverted value. mull is cheap on any
> reasonable CPU.  Please fix sparse.

Not that I really know the code of sparse but what would be an
acceptable condition (except plain simply disabling/removing the warning
as such)?
No warning if it's a constant value (read: explicit or sizeof())?

	Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at

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