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@google.com>
Reviewed-by: Sergio González Collado <sergio.collado@gmail.com>
Tested-by: Sergio González Collado <sergio.collado@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 6982b63775da583735b8e5d52e4a784de719293c..a526ca1c688be66a219c8df1a0c5502ee331e06a 100644 (file)
--- 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 ad4ff3b0e91e5775b0642160a0d2a258ea2f8dff..4db186f019ae46675e3b3582544e0245b78fc4a8 100644 (file)
--- 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