From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Date: Sat, 5 Mar 2022 04:16:43 +0530
Subject: compiler_types.h: Add unified __diag_ignore_all for GCC/LLVM
Patch-mainline: v5.18-rc1
Git-commit: 4d1ea705d797e66edd70ffa708b83888a210a437
References: jsc#PED-1377

Add a __diag_ignore_all macro, to ignore warnings for both GCC and LLVM,
without having to specify the compiler type and version. By default, GCC
8 and clang 11 are used. This will be used by bpf subsystem to ignore
-Wmissing-prototypes warning for functions that are meant to be global
functions so that they are in vmlinux BTF, but don't have a prototype.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220304224645.3677453-7-memxor@gmail.com
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 include/linux/compiler-clang.h |    3 +++
 include/linux/compiler-gcc.h   |    3 +++
 include/linux/compiler_types.h |    4 ++++
 3 files changed, 10 insertions(+)

--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -103,3 +103,6 @@
 #else
 #define __diag_clang_11(s)
 #endif
+
+#define __diag_ignore_all(option, comment) \
+	__diag_clang(11, ignore, option)
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -132,6 +132,9 @@
 #define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
 #endif
 
+#define __diag_ignore_all(option, comment) \
+	__diag_GCC(8, ignore, option)
+
 /*
  * Turn individual warnings and errors on and off locally, depending
  * on version.
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -353,4 +353,8 @@ struct ftrace_likely_data {
 #define __diag_error(compiler, version, option, comment) \
 	__diag_ ## compiler(version, error, option)
 
+#ifndef __diag_ignore_all
+#define __diag_ignore_all(option, comment)
+#endif
+
 #endif /* __LINUX_COMPILER_TYPES_H */