Re: [PATCH V9 07/21] csky: MMU and page table management

[Arnd Bergmann]

On Tue, Oct 16, 2018 at 5:01 AM Guo Ren <ren_guo@xxxxxxxxx> wrote:
>
> This patch adds files related to memory management and here is our
> memory-layout:
>
>    Fixmap       : 0xffc02000 â 0xfffff000       (4 MB - 12KB)
>    Pkmap        : 0xff800000 â 0xffc00000       (4 MB)
>    Vmalloc      : 0xf0200000 â 0xff000000       (238 MB)
>    Lowmem       : 0x80000000 â 0xc0000000       (1GB)
>
> abiv1 CPU (CK610) is VIPT cache and it doesn't support highmem.
> abiv2 CPUs are all PIPT cache and they could support highmem.
>
> Lowmem is directly mapped by msa0 & msa1 reg, and we needn't setup
> memory page table for it.
>
> Link:https://lore.kernel.org/lkml/20180518215548.GH17671@xxxxxxxxxxxxxxxxxxxxx/
> Signed-off-by: Guo Ren <ren_guo@xxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>

Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>

Christoph had all the useful comments on this one, I just checked that I didn't
spot anything beyond that.

      Arnd