linux-kernel - Re: [PATCH] drm: vmwgfx: include linux/highmem.h

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Date:   Mon, 11 May 2020 09:52:30 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     VMware Graphics <linux-graphics-maintainer@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Christian König <christian.koenig@....com>,
        Christoph Hellwig <hch@....de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Andy Lutomirski <luto@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Chris Zankel <chris@...kel.net>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Helge Deller <deller@....de>, "H. Peter Anvin" <hpa@...or.com>,
        Huang Rui <ray.huang@....com>, Ingo Molnar <mingo@...hat.com>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm: vmwgfx: include linux/highmem.h

On Mon, May 11, 2020 at 4:53 AM Ira Weiny <ira.weiny@...el.com> wrote:
>
> On Sat, May 09, 2020 at 12:01:31AM +0200, Arnd Bergmann wrote:
> > In order to call kmap_atomic() etc, we need to include linux/highmem.h:
> >
> > drivers/gpu/drm/vmwgfx/vmwgfx_blit.c: In function 'vmw_bo_cpu_blit_line':
> > drivers/gpu/drm/vmwgfx/vmwgfx_blit.c:377:4: error: implicit declaration of function 'kunmap_atomic'; did you mean 'in_atomic'? [-Werror=implicit-function-declaration]
> >   377 |    kunmap_atomic(d->src_addr);
> >       |    ^~~~~~~~~~~~~
> >       |    in_atomic
> > drivers/gpu/drm/vmwgfx/vmwgfx_blit.c:391:5: error: implicit declaration of function 'kmap_atomic_prot' [-Werror=implicit-function-declaration]
> >   391 |     kmap_atomic_prot(d->dst_pages[dst_page],
> >       |     ^~~~~~~~~~~~~~~~
> > drivers/gpu/drm/vmwgfx/vmwgfx_blit.c:390:16: warning: assignment to 'u8 *' {aka 'unsigned char *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
> >   390 |    d->dst_addr =
> >       |                ^
> > drivers/gpu/drm/vmwgfx/vmwgfx_blit.c:403:16: warning: assignment to 'u8 *' {aka 'unsigned char *'} from 'int' makes pointer from integer without a cast [-Wint-conversion]
> >   403 |    d->src_addr =
> >       |                ^
> >
> > Fixes: 46385a895322 ("drm: remove drm specific kmap_atomic code")
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> I'm curious about the config which failed...  Because this compiled for me.
> Regardless it was stupid of me to not include this.
>
> Thanks,
>
> Reviewed-by: Ira Weiny <ira.weiny@...el.com>

I do a lot of randconfig build tests and only one of them had this problem.

See https://pastebin.com/LmX0Jfbg for reference, I did not check further
which of the options caused this.

      Arnd