[PATCH 0/3] Support MODVERSIONS by disabling Rust modules

[Matthew Maurer <mmaurer@google.com>]

The goal of this patch series is to allow MODVERSIONS to be turned on
alongside RUST. Gary Guo previously proposed to adjust the API to
support Rust symbols' greater length:
https://lore.kernel.org/lkml/CANiq72n4MbR+AE7eHfVQZOu26FeSttQnEEMT3Jpft+CcGwk9jw@mail.gmail.com/T/

This did not land, so I'm proposing an alternate solution - users who
want to use Rust, but who do not need Rust modules, can disable Rust
module support in order to retain modversions support. This has the
added bonus of removing exported symbols from the kernel surface if we
know they won't be used due to lack of Rust module support in the
environment.

Matthew Maurer (3):
  kconfig: Extend expr_depends_symbol to recurse
  kconfig: Add special rust_modules config option
  rust: Require RUST_MODULES for module support

 init/Kconfig               | 21 +++++++++++++++++----
 kernel/module/Kconfig      |  1 +
 rust/exports.c             |  4 ++++
 scripts/kconfig/confdata.c |  3 +++
 scripts/kconfig/expr.c     | 22 ++++++++++++++++------
 scripts/kconfig/expr.h     |  3 ++-
 scripts/kconfig/lexer.l    |  1 +
 scripts/kconfig/lkc.h      |  1 +
 scripts/kconfig/menu.c     |  9 ++++++---
 scripts/kconfig/parser.y   | 12 ++++++++++++
 scripts/kconfig/symbol.c   | 31 +++++++++++++++++++++++++++++--
 11 files changed, 92 insertions(+), 16 deletions(-)

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2.42.0.869.gea05f2083d-goog