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Re: [PATCH v3 13/14] xen/dt: Allow CONFIG_DOM0LESS_BOOT to include device-tree/
- To: Alejandro Vallejo <agarciav@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 16 Jun 2025 08:55:23 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 16 Jun 2025 06:55:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.06.2025 17:13, Alejandro Vallejo wrote:
> --- a/xen/common/Kconfig
> +++ b/xen/common/Kconfig
> @@ -14,6 +14,7 @@ config CORE_PARKING
>
> config DOM0LESS_BOOT
> bool "Dom0less boot support" if EXPERT
> + select LIBFDT
> depends on HAS_DOM0LESS && HAS_DEVICE_TREE && DOMAIN_BUILD_HELPERS
> default y
> help
Nit: Imo it is good practice to have the select-s after the "depends on",
and perhaps also after any default(s).
> --- a/xen/common/Makefile
> +++ b/xen/common/Makefile
> @@ -8,7 +8,7 @@ obj-y += cpu.o
> obj-$(CONFIG_DEBUG_TRACE) += debugtrace.o
> obj-$(CONFIG_HAS_DEVICE_TREE) += device.o
> obj-$(filter-out $(CONFIG_X86),$(CONFIG_ACPI)) += device.o
> -obj-$(CONFIG_HAS_DEVICE_TREE) += device-tree/
> +obj-$(firstword $(CONFIG_HAS_DEVICE_TREE) $(CONFIG_DOM0LESS_BOOT)) +=
> device-tree/
Why not
obj-$(CONFIG_HAS_DEVICE_TREE) += device-tree/
obj-$(CONFIG_DOM0LESS_BOOT) += device-tree/
as we have it in a few similar situations?
And why would the duplication be needed in the first place? Shouldn't
DOM0LESS_BOOT imply HAS_DEVICE_TREE? Sadly the description once again
only says what is intended, but not why. And the dependency is actually
visible in patch context above, in the hunk altering xen/common/Kconfig.
Jan
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