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Re: [Xen-devel] [PATCH 3/8] drm/xen-front: fix 32-bit build warning



Hi,

On 05/25/2018 06:50 PM, Arnd Bergmann wrote:
In 32-bit kernel builds, we cannot cast between a pointer and a 64-bit
type:

In file included from drivers/gpu/drm/xen/xen_drm_front_cfg.c:18:
drivers/gpu/drm/xen/xen_drm_front.h: In function 'xen_drm_front_fb_to_cookie':
drivers/gpu/drm/xen/xen_drm_front.h:129:9: error: cast from pointer to integer 
of different size [-Werror=pointer-to-int-cast]
   return (u64)fb;

drivers/gpu/drm/xen/xen_drm_front.h: In function 'xen_drm_front_dbuf_to_cookie':
drivers/gpu/drm/xen/xen_drm_front.h:134:9: error: cast from pointer to integer 
of different size [-Werror=pointer-to-int-cast]
   return (u64)gem_obj;

drivers/gpu/drm/xen/xen_drm_front_shbuf.c: In function 'backend_unmap':
drivers/gpu/drm/xen/xen_drm_front_shbuf.c:125:4: error: cast from pointer to 
integer of different size [-Werror=pointer-to-int-cast]
    ((phys_addr_t)pfn_to_kaddr(page_to_xen_pfn(page)))

Using uintptr_t instead probably does what we want here, although it's
not clear to me why we assign a virtual address pointer to a phys_addr_t
in backend_unmap().

Fixes: c575b7eeb89f ("drm/xen-front: Add support for Xen PV display frontend")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
  drivers/gpu/drm/xen/xen_drm_front.h       | 4 ++--
  drivers/gpu/drm/xen/xen_drm_front_shbuf.c | 2 +-
  2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xen/xen_drm_front.h 
b/drivers/gpu/drm/xen/xen_drm_front.h
index 2c2479b571ae..5693b4a4b02b 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.h
+++ b/drivers/gpu/drm/xen/xen_drm_front.h
@@ -126,12 +126,12 @@ struct xen_drm_front_drm_info {
static inline u64 xen_drm_front_fb_to_cookie(struct drm_framebuffer *fb)
  {
-       return (u64)fb;
+       return (uintptr_t)fb;
  }
static inline u64 xen_drm_front_dbuf_to_cookie(struct drm_gem_object *gem_obj)
  {
-       return (u64)gem_obj;
+       return (uintptr_t)gem_obj;
  }
int xen_drm_front_mode_set(struct xen_drm_front_drm_pipeline *pipeline,
diff --git a/drivers/gpu/drm/xen/xen_drm_front_shbuf.c 
b/drivers/gpu/drm/xen/xen_drm_front_shbuf.c
index 8099cb343ae3..d333b67cc1a0 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_shbuf.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_shbuf.c
@@ -122,7 +122,7 @@ static void guest_calc_num_grefs(struct xen_drm_front_shbuf 
*buf)
  }
#define xen_page_to_vaddr(page) \
-               ((phys_addr_t)pfn_to_kaddr(page_to_xen_pfn(page)))
+               ((uintptr_t)pfn_to_kaddr(page_to_xen_pfn(page)))
static int backend_unmap(struct xen_drm_front_shbuf *buf)
  {
Thank you for your patch: this issue was already discussed [1] and applied [2] to
drm-misc-next.

Thank you,
Oleksandr

[1] https://patchwork.freedesktop.org/patch/224359/
[2] https://patchwork.freedesktop.org/patch/224920/

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