Merge pull request torvalds#524 from ojeda/kconfig-werror

Kconfig: document `CONFIG_WERROR` applies to Rust too

Author: ojeda

init/Kconfig

@@ -151,7 +151,8 @@ config WERROR
 	default COMPILE_TEST
 	help
 	  A kernel build should not cause any compiler warnings, and this
-	  enables the '-Werror' flag to enforce that rule by default.
+	  enables the '-Werror' (for C) and '-Dwarnings' (for Rust) flags
+	  to enforce that rule by default.
 
 	  However, if you have a new (or very old) compiler with odd and
 	  unusual warnings, or you have some architecture with problems,