linux-kernel - Re: New bcache compiler warning (was: Re: bcache: Minor fixes from kbuild robot)

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Message-ID: <20140217224645.GC11655@kmo>
Date:	Mon, 17 Feb 2014 14:46:45 -0800
From:	Kent Overstreet <kmo@...erainc.com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-bcache@...r.kernel.org
Subject: Re: New bcache compiler warning (was: Re: bcache: Minor fixes from
 kbuild robot)

On Mon, Feb 17, 2014 at 02:44:47PM -0800, Randy Dunlap wrote:
> Could that cause a truncation?  unsigned means unsigned int.
> Can unsigned int be smaller (fewer bits) than the k pointer?
> If so, is that OK or a problem?

It's just truncating the offset of the pointer within the struct bset, which is
part of a btree node - the thing that's being cast is restricted to be no bigger
than a btree node, which is at most a few mb.
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