linux-kernel - Re: [PATCH 1/4] of: add struct page support to rmem

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Date:   Tue, 12 Jul 2022 11:13:51 +0800
From:   Li Chen <me@...ux.beauty>
To:     "Arnd Bergmann" <arnd@...db.de>
Cc:     "Catalin Marinas" <catalin.marinas@....com>,
        "Will Deacon" <will@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Frank Rowand" <frowand.list@...il.com>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Li Chen" <lchen@...arella.com>,
        "Linux ARM" <linux-arm-kernel@...ts.infradead.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        "DTML" <devicetree@...r.kernel.org>,
        "Linux-MM" <linux-mm@...ck.org>
Subject: Re: [PATCH 1/4] of: add struct page support to rmem

Hi Arnd,
 ---- On Mon, 11 Jul 2022 23:06:50 +0800  Arnd Bergmann <arnd@...db.de> wrote --- 
 > On Mon, Jul 11, 2022 at 4:51 PM Li Chen <me@...ux.beauty> wrote:
 > >  ---- On Mon, 11 Jul 2022 21:36:12 +0800  Arnd Bergmann <arnd@...db.de> wrote ---
 > >  > On Mon, Jul 11, 2022 at 2:24 PM Li Chen <me@...ux.beauty> wrote:
 > >  >
 > >  > > +config OF_RESERVED_MEM_DIO_SUPPORT
 > >  > > +       bool "add Direct I/O support to reserved_mem"
 > >  > > +       depends on ZONE_DEVICE && ARCH_KEEP_MEMBLOCK
 > >  > > +       help
 > >  > > +          By default, reserved memory don't get struct page support, which
 > >  > > +                means you cannot do Direct I/O from this region. This config takes
 > >  > > +                uses of ZONE_DEVICE and treats rmem as hotplug mem to get struct
 > >  > > +                page and DIO support.
 > >  >
 > >  > This probably does not need to be user visible, it's enough to select it from
 > >  > the drivers that need it.
 > >
 > > When you say "user visible", do you mean the config can be dropped or something else like Kconfig type other than bool?
 > 
 > I mean this can be a hidden option, which you can do by leaving out the
 > one-line description after the 'bool' keyword. The option will still
 > be selectable
 > in Kconfig files from other options, but not shown in 'make menuconfig'.
 > 
 >         Arnd
 > 

Roger that. I will do it in v2.

Regards,
Li