Re: [PATCH 0/6] phase out CONFIG_VIRT_TO_BUS

Greg Kroah-Hartman
2022-06-06T09:25:44Z

On Mon, Jun 06, 2022 at 10:41:03AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> The virt_to_bus/bus_to_virt interface has been deprecated for
> decades. After Jakub Kicinski put a lot of work into cleaning out the
> network drivers using them, there are only a couple of other drivers
> left, which can all be removed or otherwise cleaned up, to remove the
> old interface for good.
>
> Any out of tree drivers using virt_to_bus() should be converted to
> using the dma-mapping interfaces, typically dma_alloc_coherent()
> or dma_map_single()).
>
> There are a few m68k and ppc32 specific drivers that keep using the
> interfaces, but these are all guarded with architecture-specific
> Kconfig dependencies, and are not actually broken.
>
> There are still a number of drivers that are using virt_to_phys()
> and phys_to_virt() in place of dma-mapping operations, and these
> are often broken, but they are out of scope for this series.

I'll take patches 1 and 2 right now through my staging tree if that's
ok.

thanks,

greg k-h