On 07/20/2018 05:08 PM, Boris Ostrovsky wrote:
On 07/20/2018 05:01 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com
This work is in response to my previous attempt to introduce Xen/DRM zero-copy driver [1] to enable Linux dma-buf API [2] for Xen based frontends/backends. There is also an existing hyper_dmabuf approach available [3] which, if reworked to utilize the proposed solution, can greatly benefit as well.
Lot of warnings on i386 build:
In file included from /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.c:24: /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In function ‘xen_drm_front_fb_to_cookie’: /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h:129:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] return (u64)fb; ^ /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In function ‘xen_drm_front_dbuf_to_cookie’: /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h:134:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] return (u64)gem_obj; ^ CC [M] net/netfilter/ipset/ip_set_hash_ipport.o CC drivers/media/rc/keymaps/rc-tango.o CC [M] drivers/gpu/drm/vmwgfx/vmwgfx_fifo.o AR drivers/misc/built-in.a In file included from /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front_kms.c:20: /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h: In function ‘xen_drm_front_fb_to_cookie’: CC [M] drivers/gpu/drm/xen/xen_drm_front_conn.o /data/upstream/linux-xen/drivers/gpu/drm/xen/xen_drm_front.h:129:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] return (u64)fb; (and more)
The above warnings already have a fix [1] which is expected in 4.19
and then
data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c: In function ‘gntdev_ioctl_dmabuf_exp_from_refs’: /data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:503:6: warning: ‘args.fd’ may be used uninitialized in this function [-Wmaybe-uninitialized] *fd = args.fd; ~~~~^~~~~~~~~ /data/upstream/linux-xen/drivers/xen/gntdev-dmabuf.c:467:35: note: ‘args.fd’ was declared here struct gntdev_dmabuf_export_args args; ^~~~
Strangely, but my i386 build goes smooth. Which version of gcc you use and could you please give me your .config, so I can test the same?
-boris
Thank you, Oleksandr
[1] https://cgit.freedesktop.org/drm/drm-misc/commit/?id=9eece5d9c6e0316f17091e3...