selftests: bpf: Move bpf_printk to bpf_helpers.h

bpf_printk is a macro which is commonly used to print out debug messages
in BPF programs and it was copied in many selftests and samples. Since
all of them include bpf_helpers.h, this change moves the macro there.
Signed-off-by: Michal Rostecki <mrostecki@opensuse.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/bpf_helpers.h

@@ -8,6 +8,14 @@
  */
 #define SEC(NAME) __attribute__((section(NAME), used))
 
+/* helper macro to print out debug messages */
+#define bpf_printk(fmt, ...)				\
+({							\
+	char ____fmt[] = fmt;				\
+	bpf_trace_printk(____fmt, sizeof(____fmt),	\
+			 ##__VA_ARGS__);		\
+})
+
 /* helper functions called from eBPF programs written in C */
 static void *(*bpf_map_lookup_elem)(void *map, const void *key) =
 	(void *) BPF_FUNC_map_lookup_elem;

tools/testing/selftests/bpf/progs/sockmap_parse_prog.c

@@ -5,13 +5,6 @@
 
 int _version SEC("version") = 1;
 
-#define bpf_printk(fmt, ...)					\
-({								\
-	       char ____fmt[] = fmt;				\
-	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
-				##__VA_ARGS__);			\
-})
-
 SEC("sk_skb1")
 int bpf_prog1(struct __sk_buff *skb)
 {

tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c

@@ -5,13 +5,6 @@
 
 int _version SEC("version") = 1;
 
-#define bpf_printk(fmt, ...)					\
-({								\
-	       char ____fmt[] = fmt;				\
-	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
-				##__VA_ARGS__);			\
-})
-
 SEC("sk_msg1")
 int bpf_prog1(struct sk_msg_md *msg)
 {

tools/testing/selftests/bpf/progs/sockmap_verdict_prog.c

@@ -5,13 +5,6 @@
 
 int _version SEC("version") = 1;
 
-#define bpf_printk(fmt, ...)					\
-({								\
-	       char ____fmt[] = fmt;				\
-	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
-				##__VA_ARGS__);			\
-})
-
 struct bpf_map_def SEC("maps") sock_map_rx = {
 	.type = BPF_MAP_TYPE_SOCKMAP,
 	.key_size = sizeof(int),

tools/testing/selftests/bpf/progs/test_lwt_seg6local.c

@@ -6,13 +6,6 @@
 #include "bpf_helpers.h"
 #include "bpf_endian.h"
 
-#define bpf_printk(fmt, ...)				\
-({							\
-	char ____fmt[] = fmt;				\
-	bpf_trace_printk(____fmt, sizeof(____fmt),	\
-			##__VA_ARGS__);			\
-})
-
 /* Packet parsing state machine helpers. */
 #define cursor_advance(_cursor, _len) \
 	({ void *_tmp = _cursor; _cursor += _len; _tmp; })

tools/testing/selftests/bpf/progs/test_xdp_noinline.c

@@ -15,13 +15,6 @@
 #include <linux/udp.h>
 #include "bpf_helpers.h"
 
-#define bpf_printk(fmt, ...)				\
-({							\
-	char ____fmt[] = fmt;				\
-	bpf_trace_printk(____fmt, sizeof(____fmt),	\
-			##__VA_ARGS__);			\
-})
-
 static __u32 rol32(__u32 word, unsigned int shift)
 {
 	return (word << shift) | (word >> ((-shift) & 31));

tools/testing/selftests/bpf/test_sockmap_kern.h

@@ -28,13 +28,6 @@
  * are established and verdicts are decided.
  */
 
-#define bpf_printk(fmt, ...)					\
-({								\
-	       char ____fmt[] = fmt;				\
-	       bpf_trace_printk(____fmt, sizeof(____fmt),	\
-				##__VA_ARGS__);			\
-})
-
 struct bpf_map_def SEC("maps") sock_map = {
 	.type = TEST_MAP_TYPE,
 	.key_size = sizeof(int),