netdev - [PATCH bpf-next 2/2] samples/bpf: fix a compilation error with fallthrough marking

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Message-ID: <20201003021904.1468772-1-yhs@fb.com>
Date:   Fri, 2 Oct 2020 19:19:04 -0700
From:   Yonghong Song <yhs@...com>
To:     <bpf@...r.kernel.org>, <netdev@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, <kernel-team@...com>
Subject: [PATCH bpf-next 2/2] samples/bpf: fix a compilation error with fallthrough marking

Compiling samples/bpf hits an error related to fallthrough marking.
    ...
    CC  samples/bpf/hbm.o
  samples/bpf/hbm.c: In function ‘main’:
  samples/bpf/hbm.c:486:4: error: ‘fallthrough’ undeclared (first use in this function)
      fallthrough;
      ^~~~~~~~~~~

The "fallthrough" is not defined under tools/include directory.
Rather, it is "__fallthrough" is defined in linux/compiler.h.
Including "linux/compiler.h" and using "__fallthrough" fixed the issue.

Signed-off-by: Yonghong Song <yhs@...com>
---
 samples/bpf/hbm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/samples/bpf/hbm.c b/samples/bpf/hbm.c
index 4b22ace52f80..ff4c533dfac2 100644
--- a/samples/bpf/hbm.c
+++ b/samples/bpf/hbm.c
@@ -40,6 +40,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <linux/unistd.h>
+#include <linux/compiler.h>
 
 #include <linux/bpf.h>
 #include <bpf/bpf.h>
@@ -483,7 +484,7 @@ int main(int argc, char **argv)
 					"Option -%c requires an argument.\n\n",
 					optopt);
 		case 'h':
-			fallthrough;
+			__fallthrough;
 		default:
 			Usage();
 			return 0;
-- 
2.24.1