linux-kernel - Re: Linux 2.6.26-rc5

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Date:	Thu, 5 Jun 2008 10:32:23 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alejandro Riveira Fernández 
	<ariveira@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Linux 2.6.26-rc5

On Thursday 05 June 2008 10:19:01 am Linus Torvalds wrote:
> 
> On Thu, 5 Jun 2008, Bjorn Helgaas wrote:
> >  
> >  	for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
> > -		if (res->flags & IORESOURCE_DISABLED)
> > +		if (res->flags & IORESOURCE_UNSET ||
> > +		    res->flags & IORESOURCE_DISABLED)
> >  			continue;
> 
> Umm. If I was a compiler, I'd be warning about this. You don't get a 
> warning about suggesting parentheses around the '&'?

Geez, I dreamed about this very question last night, but forgot to
take care this morning.

Actually, I didn't get a warning (gcc 4.1.3), but your way is better.
Here's the updated patch if you haven't fixed it already:



PNP: skip UNSET MEM resources as well as DISABLED ones

We don't need to reserve "unset" resources.  Trying to reserve
them results in messages like this, which are ugly but harmless:

    system 00:08: iomem range 0x0-0x0 could not be reserved

Future PNP patches will remove use of IORESOURCE_UNSET, but
we still need it for now.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>

Index: work11/drivers/pnp/system.c
===================================================================
--- work11.orig/drivers/pnp/system.c	2008-06-05 09:46:33.000000000 -0600
+++ work11/drivers/pnp/system.c	2008-06-05 10:29:10.000000000 -0600
@@ -81,7 +81,7 @@ static void reserve_resources_of_dev(str
 	}
 
 	for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
-		if (res->flags & IORESOURCE_DISABLED)
+		if (res->flags & (IORESOURCE_UNSET | IORESOURCE_DISABLED))
 			continue;
 
 		reserve_range(dev, res->start, res->end, 0);
--
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