linux-kernel - Re: [GIT PULL] Staging driver changes for 6.13-rc1

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Message-ID: <f4ded99e-35c7-4651-8c73-376390ceb130@roeck-us.net>
Date: Mon, 2 Dec 2024 06:52:28 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Dave Penkler <dpenkler@...il.com>
Cc: Greg KH <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [GIT PULL] Staging driver changes for 6.13-rc1

On Mon, Dec 02, 2024 at 10:50:07AM +0100, Dave Penkler wrote:
[ ... ]
> That is weird: the type of resource.start is resource_size_t which resolves to u32 via phys_addr_t on i386 which should be the same size as void *
> For compile check purposes simply changing iobase type to phys_addr_t the following error message appears:
> 
> drivers/staging/gpib/ines/ines_gpib.c: In function 'ines_common_pci_attach':
> drivers/staging/gpib/ines/ines_gpib.c:783:28: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
>   783 |         nec_priv->iobase = (void *)(pci_resource_start(ines_priv->pci_device,
>       |                            ^
> drivers/staging/gpib/ines/ines_gpib.c:783:26: error: assignment to 'phys_addr_t' {aka 'long long unsigned int'} from 'void *' makes integer from pointer without a cast [-Wint-conversion]
>   783 |         nec_priv->iobase = (void *)(pci_resource_start(ines_priv->pci_device,
>       |                          ^
> 
> It would seem that for some reason phys_addr_t resolves to long long unsigned int

Check out CONFIG_X86_PAE, which adds 64-bit physical address support to
32-bit x86 images. Pointers are still 32 bit in that mode, though.

Guenter