[RFC PATCH v1 0/1] ARCH_FIXED_CONFIG introduction for randconfig

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

Brief Overview:
In the earlier patch series [1], it was introduced a comprehensive set of changes
enabling a full Xen build for RISC-V.
This early support primarily provides the minimum stubs required for the RISC-V
Xen build. At this stage of development, many configs are deemed unnecessary and
are expected to be disabled.

Without ARCH_FIXED_CONFIG (or an alternative mechanism), the alternative is
updating CI's build.yaml in multiple instances with the same configs,
mirroring the approach taken in [1] to prevent the inadvertent activation of
unsupported configs.

For example, in scenarios like dom0less, we can exclude grant tables by setting
"CONFIG_GRANT_TABLE=n" in ARCH_FIXED_CONFIG. This eliminates the need for intricate
modifications to Kconfig configurations with conditions like "depends on X86 || ARM"
or the introduction of HAS_* conditions followed by Kconfig updates with
"depends on HAS_*," as illustrated in examples [2] or [3].

It might be useful for other architectures as well, especially for PPC, which is
currently under development.

There are several open questions:
- Does introduction of ARCH_FIXED_CONFIG make sense?
- Should ARCH_FIXED_CONFIG be re-used for *defconfig?

[1] https://lore.kernel.org/xen-devel/b4e85f8f58787b4d179022973ce25673d6b56e36.1700761381.git.oleksii.kurochko@gmail.com/
[2] https://lore.kernel.org/xen-devel/cdc20255540a66ba0b6946ac6d48c11029cd3385.1701453087.git.oleksii.kurochko@gmail.com/
[3] https://lore.kernel.org/xen-devel/d42a34866edc70a12736b5c6976aa1b44b4ebd8a.1701453087.git.oleksii.kurochko@gmail.com/

Oleksii Kurochko (1):
  xen/Makefile: introduce ARCH_FIXED_CONFIG for randconfig

 xen/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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2.43.0