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

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Date:   Thu, 18 Oct 2018 10:05:54 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        David Miller <davem@...emloft.net>,
        gregkh <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rob Herring <robh@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>, c-sky_gcc_upstream@...ky.com
Subject: Re: [PATCH V9 07/21] csky: MMU and page table management

On Wed, Oct 17, 2018 at 05:06:56PM +0200, Arnd Bergmann wrote:
> On Tue, Oct 16, 2018 at 5:01 AM Guo Ren <ren_guo@...ky.com> wrote:
> >
> > This patch adds files related to memory management and here is our
> > memory-layout:
> >
> >    Fixmap       : 0xffc02000 – 0xfffff000       (4 MB - 12KB)
> >    Pkmap        : 0xff800000 – 0xffc00000       (4 MB)
> >    Vmalloc      : 0xf0200000 – 0xff000000       (238 MB)
> >    Lowmem       : 0x80000000 – 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@n2100.armlinux.org.uk/
> > Signed-off-by: Guo Ren <ren_guo@...ky.com>
> > Cc: Christoph Hellwig <hch@...radead.org>
> > Cc: Arnd Bergmann <arnd@...db.de>
> 
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> 
> Christoph had all the useful comments on this one, I just checked that I didn't
> spot anything beyond that.
Yes, Christoph help a lot and find a critical bug of "sync_dma > 4K".

Best Regards
 Guo Ren