linux-kernel - Re: [PATCH RESEND]Remove a warning for drivers/edac/i82975x

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Date:	Thu, 9 Jun 2011 10:37:47 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Harry Wei <jiaweiwei.xiyou@...il.com>,
	Doug Thompson <dougthompson@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, ravi@...ztechnologies.com,
	arvino55@...il.com, greg@...ah.com, akpm@...ux-foundation.org,
	randy.dunlap@...cle.com, joe@...ches.com
Subject: Re: [PATCH RESEND]Remove a warning for drivers/edac/i82975x_edac.c

On Thu, 9 Jun 2011 11:04:13 +0800 Harry Wei wrote:

> From: Harry Wei <harryxiyou@...il.com>
> 
> When i compile 2.6.39.1, a warning shows like below.
> This patch can fix the warning. And i works well with
> my PC.
> 
> [...]
> CC [M]  drivers/edac/e752x_edac.o
> CC [M]  drivers/edac/i82875p_edac.o
> CC [M]  drivers/edac/i82975x_edac.o
> drivers/edac/i82975x_edac.c: In function ���i82975x_process_error_info���:
> drivers/edac/i82975x_edac.c:298: warning: integer constant is too large for ���unsigned long��� type
> CC [M]  drivers/edac/i3000_edac.o
> CC [M]  drivers/edac/i3200_edac.o
> CC [M]  drivers/edac/x38_edac.o
> CC [M]  drivers/edac/i82860_edac.o
> [...]
> 
> 
> Signed-off-by: Harry Wei <harryxiyou@...il.com>
> Index: prj/drivers/edac/i82975x_edac.c
> ===================================================================
> --- prj.orig/drivers/edac/i82975x_edac.c	2011-06-04 10:09:55.351174516 +0800
> +++ prj/drivers/edac/i82975x_edac.c	2011-06-04 10:10:30.875168437 +0800
> @@ -293,9 +293,9 @@
>  		info->errsts = info->errsts2;
>  	}
>  
> -	page = (unsigned long) info->eap;
> +	page = (unsigned long long) info->eap;

But page is still unsigned long, not unsigned long long...

>  	if (info->xeap & 1)
> -		page |= 0x100000000ul;
> +		page |= 0x100000000ull;

and just making this second change fixes the warning.

I don't know what the right answer is, but this patch does not look
complete to me.

Back in April there was a discussion about this warning message and the
conclusion was that this driver should be replaced.  See
https://lkml.org/lkml/2011/4/21/232 and its replies.
But we seem to be having problems reaching the EDAC subsystem maintainer
(again cc-ed).


>  	chan = page & 1;
>  	page >>= 1;
>  	offst = page & ((1 << PAGE_SHIFT) - 1);
> --

---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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