[Intel-gfx] [PATCH] io-mapping.h: s/PAGE_KERNEL_IO/PAGE_KERNEL/

[Chris Wilson]

On Tue, Aug 23, 2016 at 02:05:18PM +0200, Daniel Vetter wrote:
> On Tue, Aug 23, 2016 at 11:04:03AM +0300, Joonas Lahtinen wrote:
> > On ti, 2016-08-23 at 08:22 +0100, Chris Wilson wrote:
> > > PAGE_KERNEL_IO is an x86-ism. Though it is used to define the pgprot_t
> > > used for the iomapped region, it itself is just PAGE_KERNEL. On all
> > > other arches, PAGE_KERNEL_IO is undefined so in a general header we must
> > > refrain from using it.
> > > 
> > 
> > There is;
> > 
> > #define __PAGE_KERNEL_IO           (__PAGE_KERNEL)
> > 
> > So no functional change, but will compile on all archs.
> > 
> > Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> 
> Still not happy:
> 
>   CC      drivers/gpio/gpiolib-of.o
> In file included from drivers/gpio/gpiolib-of.c:19:0:
> ./include/linux/io-mapping.h: In function ‘io_mapping_init_wc’:
> ./include/linux/io-mapping.h:125:16: error: implicit declaration of function ‘pgprot_writecombine’ [-Werror=implicit-function-declaration]
>   iomap->prot = pgprot_writecombine(PAGE_KERNEL);
>                 ^~~~~~~~~~~~~~~~~~~
> ./include/linux/io-mapping.h:125:36: error: ‘PAGE_KERNEL’ undeclared (first use in this function)
>   iomap->prot = pgprot_writecombine(PAGE_KERNEL);
>                                     ^~~~~~~~~~~

That was pulled in by the x86 headers,

#include <asm/pgtable.h>

-- 
Chris Wilson, Intel Open Source Technology Centre