linux-kernel - Re: [PATCH] utilities: add helper functions for safe 64-bit integer operations as 32-bit halves

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Message-ID: <20070422133823.4bd3eaed@the-village.bc.nu>
Date:	Sun, 22 Apr 2007 13:38:23 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"John Anthony Kazos Jr." <jakj@...-k-j.com>,
	James Bottomley <James.Bottomley@...elEye.com>,
	"Cameron, Steve" <Steve.Cameron@...com>,
	"Miller, Mike (OS Dev)" <Mike.Miller@...com>,
	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, trivial@...nel.org
Subject: Re: [PATCH] utilities: add helper functions for safe 64-bit integer
 operations as 32-bit halves

> > > over-engineering. Call it sector_upper32() do it the simple way and stop
> > > trying to solve a problem we don't have
> > 
> > James said we have the same problem with dma_addr_t.
> 
> Yes.  It's in fact the far more common case and we have a bread of
> macros dealing with the issue in various drivers.

So we still only need it for unsigned 32/64bit values ?



Alan
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