[PATCH 1/2] drm/i915/gem: stop using PAGE_KERNEL_IO

[Lucas De Marchi <lucas.demarchi@xxxxxxxxx>]

PAGE_KERNEL_IO is only defined for x86 and nowadays is the same as
PAGE_KERNEL. It was different for some time, OR'ing a `_PAGE_IOMAP` flag
in commit be43d72835ba ("x86: add _PAGE_IOMAP pte flag for IO
mappings").  This got removed in commit f955371ca9d3 ("x86: remove the
Xen-specific _PAGE_IOMAP PTE flag"), so today they are just the same.

This is the same that was done in commit ac96b5566926 ("io-mapping.h:
s/PAGE_KERNEL_IO/PAGE_KERNEL/").

There is a subsequent commit with
'Fixes: ac96b5566926 ("io-mapping.h: s/PAGE_KERNEL_IO/PAGE_KERNEL/")' -
but that is not relevant here since is it's actually fixing the different
names for pgprot_writecombine(), which we also don't have today since
all archs expose pgprot_writecombine(). Microblaze, mentioned in that
discussion, gained pgprot_writecombine() in
commit 97ccedd793ac ("microblaze: Provide pgprot_device/writecombine
macros for nommu").

So, just use PAGE_KERNEL, and just use pgprot_writecombine().

Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Link: 
https://patchwork.freedesktop.org/patch/msgid/20211020090625.1037517-1-lucas.demarchi@xxxxxxxxx
---
 drivers/gpu/drm/i915/gem/i915_gem_pages.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c 
b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 8eb1c3a6fc9c..68fe1837ef54 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -289,7 +289,7 @@ static void *i915_gem_object_map_page(struct 
drm_i915_gem_object *obj,
                pgprot = PAGE_KERNEL;
                break;
        case I915_MAP_WC:
-               pgprot = pgprot_writecombine(PAGE_KERNEL_IO);
+               pgprot = pgprot_writecombine(PAGE_KERNEL);
                break;
        }
 
@@ -333,7 +333,7 @@ static void *i915_gem_object_map_pfn(struct 
drm_i915_gem_object *obj,
        i = 0;
        for_each_sgt_daddr(addr, iter, obj->mm.pages)
                pfns[i++] = (iomap + addr) >> PAGE_SHIFT;
-       vaddr = vmap_pfn(pfns, n_pfn, pgprot_writecombine(PAGE_KERNEL_IO));
+       vaddr = vmap_pfn(pfns, n_pfn, pgprot_writecombine(PAGE_KERNEL));
        if (pfns != stack)
                kvfree(pfns);
 
-- 
2.33.1