linux-kernel - Re: [Patch 09/16] Remove unnecessary kmalloc casts in the pci subsystem.

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Date:	Tue, 31 Jul 2007 20:00:12 +0530 (IST)
From:	Satyam Sharma <satyam@...radead.org>
To:	Christian Borntraeger <borntraeger@...ibm.com>
cc:	jack@...keye.stone.uk.eu.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org, Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [Patch 09/16] Remove unnecessary kmalloc casts in the pci
 subsystem.



On Tue, 31 Jul 2007, Christian Borntraeger wrote:

> Am Dienstag, 31. Juli 2007 schrieb jack@...keye.stone.uk.eu.org:
> > --- a/drivers/pci/rom.c
> > +++ b/drivers/pci/rom.c
> > @@ -185,7 +185,7 @@ void __iomem *pci_map_rom_copy(struct pc
> >  			  IORESOURCE_ROM_BIOS_COPY))
> >  		return rom;
> > 
> > -	res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
> > +	res->start = kmalloc(*size, GFP_KERNEL);
> 
> This looks wrong.

Yup, a warning at the very least.

> void * doesnt need a cast to a pointer, but res->start is an 
> integer u32 type,

It better not be, else we have a bug already anyway. Pointers are 64-bit
on 64-bit archs. [ it turns out res->start is resource_size_t which is
set properly as per CONFIG_RESOURCES_64BIT which itself is set properly
as per CONFIG_64BIT, so everything is healthy and fine :-) ]

> and therefore we need a cast, no?

Yes, void * -> unsigned long cast is always ok, and what we need here.


Satyam
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