linux-kernel - [PATCH 3/3] rust: arch/um: Add support for CONFIG_RUST under x86

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Date:   Sat, 17 Dec 2022 12:44:36 +0800
From:   David Gow <davidgow@...gle.com>
To:     Miguel Ojeda <ojeda@...nel.org>,
        "Björn Roy Baron" <bjorn3_gh@...tonmail.com>,
        Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     David Gow <davidgow@...gle.com>, rust-for-linux@...r.kernel.org,
        linux-um@...ts.infradead.org, llvm@...ts.linux.dev,
        linux-doc@...r.kernel.org, kunit-dev@...glegroups.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        Daniel Latypov <dlatypov@...gle.com>,
        Jonathan Corbet <corbet@....net>
Subject: [PATCH 3/3] rust: arch/um: Add support for CONFIG_RUST under x86_64 UML

CONFIG_RUST currently supports x86_64, but does not support it under
UML. With the previous patches applied, adding support is trivial:
add CONFIG_HAVE_RUST to UML if X86_64 is set.

The scripts/generate_rust_target.rs file already checks for
CONFIG_X86_64, not CONFIG_X86, so is prepared for UML support.

The Rust support does not currently support X86_32.

Also, update the Rust architecture support documentation to not that
this is being maintained: I intend to look after this as best I can.

Signed-off-by: David Gow <davidgow@...gle.com>
---
 Documentation/rust/arch-support.rst | 2 ++
 arch/um/Kconfig                     | 1 +
 2 files changed, 3 insertions(+)

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 6982b63775da..a526ca1c688b 100644
--- a/Documentation/rust/arch-support.rst
+++ b/Documentation/rust/arch-support.rst
@@ -17,3 +17,5 @@ Architecture  Level of support  Constraints
 ============  ================  ==============================================
 ``x86``       Maintained        ``x86_64`` only.
 ============  ================  ==============================================
+``um``        Maintained        ``x86_64`` only.
+============  ================  ==============================================
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index ad4ff3b0e91e..4db186f019ae 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -28,6 +28,7 @@ config UML
 	select TRACE_IRQFLAGS_SUPPORT
 	select TTY # Needed for line.c
 	select HAVE_ARCH_VMAP_STACK
+	select HAVE_RUST			if X86_64
 
 config MMU
 	bool
-- 
2.39.0.314.g84b9a713c41-goog