linux-kernel - Re: [PATCH] csky: Fixup ioremap function losing

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Date:   Tue, 20 Aug 2019 16:26:28 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-csky@...r.kernel.org, zhang_jian5@...uatech.com,
        Guo Ren <ren_guo@...ky.com>
Subject: Re: [PATCH] csky: Fixup ioremap function losing

On Mon, Aug 19, 2019 at 2:21 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Sun, Aug 18, 2019 at 10:20:18AM +0800, Guo Ren wrote:
> > > > Also change flag VM_ALLOC to VM_IOREMAP in get_vm_area_caller.
> > >
> > > Looks generally fine, but two comments:
> > >
> > >  - do you have a need for ioremap_cache?  We are generally try to
> > >    phase it out in favour of memremap, and it is generally only used
> > >    by arch specific code.
> > Yes, some drivers of our customers use ioremap_cache to map phy_addr
> > which isn't belong to system memory.
>
> Which driver?  We should move it over to memremap instead of adding
> a new ioremap_cache.
The driver hasn't been upstreamed. OK, just remove ioremap_cache and
seems it's not a big problem.

-- 
Best Regards
 Guo Ren

ML: https://lore.kernel.org/linux-csky/