From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
syzbot <syzbot+04168c8063cfdde1db5e@syzkaller.appspotmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Colin King <colin.king@canonical.com>,
DRI Development <dri-devel@lists.freedesktop.org>,
Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Masahiro Yamada <masahiroy@kernel.org>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
Randy Dunlap <rdunlap@infradead.org>
Subject: Re: [PATCH] fbmem: don't allow too huge resolutions
Date: Tue, 31 Aug 2021 20:53:21 +0200 [thread overview]
Message-ID: <CAKMK7uF1cnen2UVWeOL164z1CCqOuRMC5SmM+5GvRvi7C-UOTw@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdWbSUGRGAVi-17C3hyDBZnGLAsmbAs+wXPHiCNWWLbMpA@mail.gmail.com>
On Tue, Aug 31, 2021 at 7:19 PM Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>
> Hi Handa-san,
>
> On Tue, Aug 31, 2021 at 5:24 PM Tetsuo Handa
> <penguin-kernel@i-love.sakura.ne.jp> wrote:
> > On 2021/08/31 15:48, Geert Uytterhoeven wrote:
> > > Furthermore, this restricts the virtual frame buffer size on 64-bit,
> > > too, while graphics cards can have much more than 4 GiB of RAM.
> >
> > Excuse me, but do you mean that some hardware allows allocating more than
> > UINT_MAX bytes of memory for kernel frame buffer drivers?
>
> While smem_len is u32 (there have been complaints about such
> limitations on 64-bit platforms as far as 10 years ago), I see no
> reason why a graphics card with more than 4 GiB of RAM would not be
> able to provide a very large virtual screen.
>
> Of course e.g. vga16fb cannot, as it is limited to 64 KiB.
The first gpus with 4GB or more memory started shipping in 2012. We're
not going to have fbdev drivers for these, so let's not invent code
for use-cases that aren't please.
Thanks, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
next prev parent reply other threads:[~2021-08-31 18:53 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-14 5:16 [syzbot] BUG: unable to handle kernel paging request in vga16fb_fillrect syzbot
2021-08-30 0:24 ` Randy Dunlap
2021-08-30 2:27 ` Tetsuo Handa
2021-08-30 2:31 ` Randy Dunlap
2021-08-30 16:05 ` [PATCH] fbmem: don't allow too huge resolutions Tetsuo Handa
2021-08-31 6:48 ` Geert Uytterhoeven
2021-08-31 15:23 ` Tetsuo Handa
2021-08-31 16:20 ` Daniel Vetter
2021-08-31 17:19 ` Geert Uytterhoeven
2021-08-31 18:53 ` Daniel Vetter [this message]
2021-08-31 18:56 ` Geert Uytterhoeven
2021-08-31 19:04 ` Daniel Vetter
2021-09-01 1:14 ` [PATCH v2] " Tetsuo Handa
2021-09-01 7:12 ` Geert Uytterhoeven
2021-08-30 12:00 ` [syzbot] BUG: unable to handle kernel paging request in vga16fb_fillrect Geert Uytterhoeven
2021-08-30 13:00 ` Dan Carpenter
2021-08-30 13:37 ` Tetsuo Handa
2021-08-30 13:47 ` Dan Carpenter
2021-08-30 14:25 ` Tetsuo Handa
2021-08-30 14:29 ` Dan Carpenter
2021-08-30 14:30 ` Geert Uytterhoeven
2021-08-30 14:38 ` Tetsuo Handa
2021-08-30 14:53 ` Geert Uytterhoeven
2021-08-30 15:00 ` Geert Uytterhoeven
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