Re: [PATCH] fbmem: don't allow too huge resolutions

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.

Gr{oetje,eeting}s,

Geert