linux-kernel - RE: [PATCH] cciss: Fix warnings during compilation under 32bitenvironment

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Message-ID: <226E1C65E4F6164E8EA5FD3CC913AE8CF4632C@G3W0639.americas.hpqcorp.net>
Date:	Thu, 19 Apr 2007 16:26:22 -0000
From:	"Miller, Mike (OS Dev)" <Mike.Miller@...com>
To:	"James Bottomley" <James.Bottomley@...elEye.com>
Cc:	"Hisashi Hifumi" <hifumi.hisashi@....ntt.co.jp>,
	<akpm@...ux-foundation.org>, <jens.axboe@...cle.com>,
	<linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	"Cameron, Steve" <steve.cameron@...com>
Subject: RE: [PATCH] cciss: Fix warnings during compilation under 32bitenvironment

 

> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@...elEye.com] 
> Sent: Thursday, April 19, 2007 11:22 AM
> To: Miller, Mike (OS Dev)
> Cc: Hisashi Hifumi; akpm@...ux-foundation.org; 
> jens.axboe@...cle.com; linux-kernel@...r.kernel.org; 
> linux-scsi@...r.kernel.org; Cameron, Steve
> Subject: RE: [PATCH] cciss: Fix warnings during compilation 
> under 32bitenvironment
> 
> On Thu, 2007-04-19 at 16:12 +0000, Miller, Mike (OS Dev) wrote:
> > > > Nak. You still haven't told where you saw these warnings. What 
> > > > compiler are you using? I do not see these in my 32-bit 
> environment.
> > > 
> > > I think it's seen with CONFIG_LBD=n on 32 bits
> > > 
> > > In that configuration, sector_t is a u32 (it's u64 even 
> on 32 bits 
> > > with CONFIG_LBD=y).  The proposed code change is a simple cut and 
> > > paste from the sd driver.
> > 
> > Isn't there a better way than testing each one?
> 
> It's not such a bad option.  The sizeof() test is compile 
> time determinable, so the compiler simply zeros the fields in 
> the CONFIG_LBD=n case and does the shift for CONFIG_LBD=y.  
> It certainly never compiles to four inline condition checks.
> 
OKIE-DOKIE then, add the change.

Acked-by: Mike Miller <mike.miller@...com>
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