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Re: [PATCH RESEND 2/2] xen: Allow EXPERT mode to be selected from the menuconfig directly

Hi Jan,

On 04/05/2020 10:18, Jan Beulich wrote:
On 30.04.2020 17:35, Julien Grall wrote:
On 30/04/2020 15:50, Jan Beulich wrote:
On 30.04.2020 16:25, Julien Grall wrote:
EXPERT mode is currently used to gate any options that are in technical
preview or not security supported At the moment, the only way to select
it is to use XEN_CONFIG_EXPERT=y on the make command line.

However, if the user forget to add the option of one of the make
command (even a clean), then .config will get rewritten. This may lead
to a rather frustrating experience as it is difficult to diagnostic the

Is / will this still be true after Anthony's rework of the build
system? Right now we already have

clean-targets := %clean
no-dot-config-targets := $(clean-targets) \

I haven't tried Anthony's rework yet. But I guess the problem would
be the same if you forget to add XEN_CONFIG_EXPERT=y on make.

Why? xen/.config would get re-written only if kconfig got run in
the first place. It is my understanding that no-dot-config-targets
exist to avoid including .config, and as a result make won't find
a need anymore to cause it to re-made if out of date.

kconfig may be executed because you change one of the */Kconfig file. So if you happen to forget XEN_CONFIG_EXPERT=y on your build command line, then you will have your .config rewritten without expert options.


Julien Grall



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