An addition to compiler_attributes.h thanks to:

- Remove CONFIG_ENABLE_MUST_CHECK (Masahiro Yamada)
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Merge tag 'compiler-attributes-for-linus-v5.11' of git://github.com/ojeda/linux

Pull ENABLE_MUST_CHECK removal from Miguel Ojeda:
 "Remove CONFIG_ENABLE_MUST_CHECK (Masahiro Yamada)"

Note that this removes the config option by making the must-check
unconditional, not by removing must check itself.

* tag 'compiler-attributes-for-linus-v5.11' of git://github.com/ojeda/linux:
  Compiler Attributes: remove CONFIG_ENABLE_MUST_CHECK

include/linux/compiler_attributes.h

@@ -272,6 +272,12 @@
  */
 #define __used                          __attribute__((__used__))
 
+/*
+ *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-warn_005funused_005fresult-function-attribute
+ * clang: https://clang.llvm.org/docs/AttributeReference.html#nodiscard-warn-unused-result
+ */
+#define __must_check                    __attribute__((__warn_unused_result__))
+
 /*
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-weak-function-attribute
  *   gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-weak-variable-attribute

include/linux/compiler_types.h

@@ -121,12 +121,6 @@ struct ftrace_likely_data {
 	unsigned long			constant;
 };
 
-#ifdef CONFIG_ENABLE_MUST_CHECK
-#define __must_check		__attribute__((__warn_unused_result__))
-#else
-#define __must_check
-#endif
-
 #if defined(CC_USING_HOTPATCH)
 #define notrace			__attribute__((hotpatch(0, 0)))
 #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY)

lib/Kconfig.debug

@@ -295,14 +295,6 @@ config GDB_SCRIPTS
 
 endif # DEBUG_INFO
 
-config ENABLE_MUST_CHECK
-	bool "Enable __must_check logic"
-	default y
-	help
-	  Enable the __must_check logic in the kernel build.  Disable this to
-	  suppress the "warning: ignoring return value of 'foo', declared with
-	  attribute warn_unused_result" messages.
-
 config FRAME_WARN
 	int "Warn for stack frames larger than"
 	range 0 8192

tools/testing/selftests/wireguard/qemu/debug.config

@@ -1,5 +1,4 @@
 CONFIG_LOCALVERSION="-debug"
-CONFIG_ENABLE_MUST_CHECK=y
 CONFIG_FRAME_POINTER=y
 CONFIG_STACK_VALIDATION=y
 CONFIG_DEBUG_KERNEL=y