Re: [PATCH v2 2/2] mmap-alloc: Include osdep.h before checking CONFIG_LINUX

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Mar 16, 2020 at 07:20:02PM +0000, Peter Maydell wrote:
> On Mon, 16 Mar 2020 at 18:40, Eduardo Habkost <ehabkost@redhat.com> wrote:
> >
> > On Mon, Mar 16, 2020 at 06:08:54PM +0000, Peter Maydell wrote:
> > > The usual approach is that if you don't have the Linux-specific
> > > feature available you quietly fall back to whatever the sensible
> > > behaviour is for when the feature isn't present. We definitely
> > > don't want to be printing warnings on non-Linux systems that
> > > are effectively just saying "you're not running Linux". Same goes
> > > for "host happens not to be running a bleeding-edge Linux kernel
> > > and this feature isn't available yet".
> >
> > I don't think using pmem=on without MAP_SYNC is expected to be a
> > supported use case, is it?  If a use case is not supported, the
> > sensible behavior is to tell the user it is not supported.
> 
> Yeah, that's fair. But the code at the moment does a fallback
> to "proceed without SHARED_VALIDATE | SYNC", so I assumed it
> was supposed to work.
> 
> thanks
> -- PMM

Oh I remember now. pmem=on was introduced without MAP_SYNC first.
So yes, it's ok to set it to 0 for mips.

-- 
MST