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

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Date:	Tue, 31 Jul 2007 22:46:19 +0800
From:	WANG Cong <xiyou.wangcong@...il.com>
To:	Satyam Sharma <satyam@...radead.org>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	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, Jul 31, 2007 at 08:00:12PM +0530, Satyam Sharma wrote:
>
>
>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 :-) ]
>

I agree.

However, I think using resource_size_t is a bit better than unsigned long,
so that we don't need to check the defination of it.

- res->start = (unsigned long)kmalloc(*size, GFP_KERNEL);
+ res->start = (resource_size_t)kmalloc(*size, GFP_KERNEL);

Is this change OK?

-- 
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mathematics. Everything else is human weakness. Accepting prizes is showing
weakness.

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