On Mon, Jul 11, 2022 at 4:51 PM Li Chen <me@linux.beauty> wrote:
> ---- On Mon, 11 Jul 2022 21:36:12 +0800 Arnd Bergmann <arnd@xxxxxxxx> wrote ---
> > On Mon, Jul 11, 2022 at 2:24 PM Li Chen <me@linux.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
