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

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Message-ID: <20100819125957.GB6729@basil.fritz.box>
Date:	Thu, 19 Aug 2010 14:59:57 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Bernd Petrovitsch <bernd@...prog.at>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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()

> 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.

-andi
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