Re: [RESEND PATCH] gpio_addr_flash: Fix warnings
From: Alan Cox
Date: Tue Nov 17 2009 - 11:57:02 EST
On Tue, 17 Nov 2009 11:50:24 -0500
Mike Frysinger <vapier.adi@xxxxxxxxx> wrote:
> On Tue, Nov 17, 2009 at 10:46, Alan Cox wrote:
> > --- a/drivers/mtd/maps/gpio-addr-flash.c
> > +++ b/drivers/mtd/maps/gpio-addr-flash.c
> > - state->gpio_addrs = (void *)gpios->start;
> > + state->gpio_addrs = (void *)(unsigned long)gpios->start;
> > - state->map.virt = (void __iomem *)memory->start;
> > + state->map.virt = (void __iomem *)(unsigned long)memory->start;
>
> on what system do you see warnings ? start should be resource_size_t
> which should be phys_addr_t which should cast fine to a void*.
32bit x86 shows it up because resource_size_t is a physaddr_t which is
64bit (because of PAE). Now given you don't seem likely to be using the
top bits for any real world example that looks ok but really casting a
physical address to a pointer type needs care and the compiler can't
deduce your intent there.
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