[PATCH v2 1/3] rust: make mutually exclusive with CFI_CLANG

[Conor Dooley]

From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>

On RISC-V, and presumably x86/arm64, if CFI_CLANG is enabled loading a
rust module will trigger a kernel panic. Support for sanitisers,
including kcfi (CFI_CLANG), is in the works, but for now they're
nightly-only options in rustc. Make RUST depend on !CFI_CLANG to prevent
configuring a kernel without symmetrical support for kfi.

Fixes: 2f7ab1267dc9 ("Kbuild: add Rust support")
cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
This probably needs to go to stable. The correct fixes tag for that I am
not sure of however, but since CFI_CLANG predates RUST, I blamed the
commit adding rust support.
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index 8d4e836e1b6b..6cf05824859e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1895,6 +1895,7 @@ config RUST
 	bool "Rust support"
 	depends on HAVE_RUST
 	depends on RUST_IS_AVAILABLE
+	depends on !CFI_CLANG
 	depends on !MODVERSIONS
 	depends on !GCC_PLUGINS
 	depends on !RANDSTRUCT
-- 
2.43.0