linux-kernel - [PATCH 2/2] selftests/hid: fix bpf compilations due to -fms-extensions

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Message-Id: <20260106-wip-fix-bpf-compilation-v1-2-0b29c85f1157@kernel.org>
Date: Tue, 06 Jan 2026 16:30:55 +0100
From: Benjamin Tissoires <bentiss@...nel.org>
To: Jiri Kosina <jikos@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, Benjamin Tissoires <bentiss@...nel.org>
Subject: [PATCH 2/2] selftests/hid: fix bpf compilations due to
 -fms-extensions

Similar to commit 835a50753579 ("selftests/bpf: Add -fms-extensions to
bpf build flags") and commit 639f58a0f480 ("bpftool: Fix build warnings
due to MS extensions")

The kernel is now built with -fms-extensions, therefore
generated vmlinux.h contains types like:
struct slab {
   ..
   struct freelist_counters;
};

Use -fms-extensions and -Wno-microsoft-anon-tag flags
to build bpf programs that #include "vmlinux.h"

Signed-off-by: Benjamin Tissoires <bentiss@...nel.org>
---
 tools/testing/selftests/hid/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile
index 2839d2612ce3..50ec9e0406ab 100644
--- a/tools/testing/selftests/hid/Makefile
+++ b/tools/testing/selftests/hid/Makefile
@@ -184,6 +184,8 @@ MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
 
 CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
 BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) 		\
+	     -Wno-microsoft-anon-tag                                    \
+	     -fms-extensions                                            \
 	     -I$(INCLUDE_DIR)
 
 CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \

-- 
2.52.0