On Tuesday, June 12, 2018 12:32:34 PM Mikulas Patocka wrote:
>
> On Mon, 4 Jun 2018, kbuild test robot wrote:
>
> > Hi Mikulas,
> >
> > I love your patch! Perhaps something to improve:
> >
> > [auto build test WARNING on drm/drm-next]
> > [also build test WARNING on v4.17-rc7 next-20180601]
> > [if your patch is applied to the wrong git tree, please drop us a note to
> > help improve the system]
> >
> > url:
> > https://github.com/0day-ci/linux/commits/Mikulas-Patocka/USB-DisplayLink-patches/20180603-233013
>
> What is it really complaining about? That URL shows 404 Not Found and this
> email has no warnings at all.
screen_base in struct fb_info is annotated with __iomem tag:
...
char __iomem *screen_base; /* Virtual address */
...
and this tag should be preserved (or explicitly casted).
> > base: git://people.freedesktop.org/~airlied/linux.git drm-next
> > reproduce:
> > # apt-get install sparse
> > make ARCH=x86_64 allmodconfig
> > make C=1 CF=-D__CHECK_ENDIAN__
You should be able to reproduce the issue with the above sequence.
> > sparse warnings: (new ones prefixed by >>)
[...]
> > 1178 u32 old_len = info->fix.smem_len;
> > > 1179 unsigned char *old_fb = info->screen_base;
> > 1180 unsigned char *new_fb;
[...]
> > 1196 if (info->screen_base) {
> > 1197 memcpy(new_fb, old_fb, old_len);
> > > 1198 dlfb_deferred_vfree(dlfb,
> > > info->screen_base);
> > 1199 }
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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