Re: [Xen-devel] [PATCH v5 07/10] arm: add a tiny kconfig configuration

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 12 Jun 2018, Julien Grall wrote:
> Hi Stefano,
> 
> On 12/06/18 01:50, Stefano Stabellini wrote:
> > On Tue, 5 Jun 2018, Julien Grall wrote:
> > > Hi Stefano,
> > > 
> > > On 04/06/18 18:24, Stefano Stabellini wrote:
> > > > Add a tiny kconfig configuration. Enabled NULL and Credit schedulers.
> > > > Support only 8 cpus. It only carries non-default options (use make
> > > 
> > > I don't see where 8 CPUs would only be supported as the default value is
> > > 128
> > > cpus.
> >   I need to update the commit message reflecting the changes to the patch
> > 
> > 
> > > > olddefconfig to produce a complete .config file).
> > > 
> > > With all the series I did the following things:
> > >   1) copy tiny.config to .config
> > >   2) make olddefconfig
> > >   3) make menuconfig and select QEMU
> > > 
> > > After 1) the numbers of CPUs are set to 128. After 3) I would expect the
> > > number of CPUs to go down to 8. Unfortunately this is not the cases.
> > > 
> > > So your command does not seem to be enough here.
> > 
> > NR_CPUS cannot go down. It is a limitation of Kconfig, similar to the
> > fact that option cannot be de-selected.
> > 
> > It is not 1) that sets NR_CPUS to 128, it would be 2) above. For this to
> > work you have to skip 2) and just do:
> > 
> >     - copy tiny.config to .config
> >     - make menuconfig and select QEMU
> 
> Well I suggested a way during one of our recent chat and I am a bit surprised
> this was not considered here.
> 
> For reminder, the way was to provide a makefile target that will select tiny
> and the platform at the same time.
> 
> make tiny_defconfig PLAT=qemu

I prefer not to add additional targets

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