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Subject[PATCH 3/3] rust: arch/um: Add support for CONFIG_RUST under x86_64 UML
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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@google.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
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