genetlink: replace custom CONCATENATE() implementation

Replace custom implementation of the macros from args.h.

Link: https://lkml.kernel.org/r/20230718211147.18647-5-andriy.shevchenko@linux.intel.comSigned-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Gow <davidgow@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/genl_magic_func.h

@@ -2,6 +2,7 @@
 #ifndef GENL_MAGIC_FUNC_H
 #define GENL_MAGIC_FUNC_H
 
+#include <linux/args.h>
 #include <linux/build_bug.h>
 #include <linux/genl_magic_struct.h>
 
@@ -23,7 +24,7 @@
 #define GENL_struct(tag_name, tag_number, s_name, s_fields)		\
 	[tag_name] = { .type = NLA_NESTED },
 
-static struct nla_policy CONCAT_(GENL_MAGIC_FAMILY, _tla_nl_policy)[] = {
+static struct nla_policy CONCATENATE(GENL_MAGIC_FAMILY, _tla_nl_policy)[] = {
 #include GENL_MAGIC_INCLUDE_FILE
 };
 
@@ -209,7 +210,7 @@ static int s_name ## _from_attrs_for_change(struct s_name *s,		\
  * Magic: define op number to op name mapping				{{{1
  *									{{{2
  */
-static const char *CONCAT_(GENL_MAGIC_FAMILY, _genl_cmd_to_str)(__u8 cmd)
+static const char *CONCATENATE(GENL_MAGIC_FAMILY, _genl_cmd_to_str)(__u8 cmd)
 {
 	switch (cmd) {
 #undef GENL_op
@@ -235,7 +236,7 @@ static const char *CONCAT_(GENL_MAGIC_FAMILY, _genl_cmd_to_str)(__u8 cmd)
 	.cmd = op_name,						\
 },
 
-#define ZZZ_genl_ops		CONCAT_(GENL_MAGIC_FAMILY, _genl_ops)
+#define ZZZ_genl_ops		CONCATENATE(GENL_MAGIC_FAMILY, _genl_ops)
 static struct genl_ops ZZZ_genl_ops[] __read_mostly = {
 #include GENL_MAGIC_INCLUDE_FILE
 };
@@ -248,32 +249,32 @@ static struct genl_ops ZZZ_genl_ops[] __read_mostly = {
  * and provide register/unregister functions.
  *									{{{2
  */
-#define ZZZ_genl_family		CONCAT_(GENL_MAGIC_FAMILY, _genl_family)
+#define ZZZ_genl_family		CONCATENATE(GENL_MAGIC_FAMILY, _genl_family)
 static struct genl_family ZZZ_genl_family;
 /*
  * Magic: define multicast groups
  * Magic: define multicast group registration helper
  */
-#define ZZZ_genl_mcgrps		CONCAT_(GENL_MAGIC_FAMILY, _genl_mcgrps)
+#define ZZZ_genl_mcgrps		CONCATENATE(GENL_MAGIC_FAMILY, _genl_mcgrps)
 static const struct genl_multicast_group ZZZ_genl_mcgrps[] = {
 #undef GENL_mc_group
 #define GENL_mc_group(group) { .name = #group, },
 #include GENL_MAGIC_INCLUDE_FILE
 };
 
-enum CONCAT_(GENL_MAGIC_FAMILY, group_ids) {
+enum CONCATENATE(GENL_MAGIC_FAMILY, group_ids) {
 #undef GENL_mc_group
-#define GENL_mc_group(group) CONCAT_(GENL_MAGIC_FAMILY, _group_ ## group),
+#define GENL_mc_group(group) CONCATENATE(GENL_MAGIC_FAMILY, _group_ ## group),
 #include GENL_MAGIC_INCLUDE_FILE
 };
 
 #undef GENL_mc_group
 #define GENL_mc_group(group)						\
-static int CONCAT_(GENL_MAGIC_FAMILY, _genl_multicast_ ## group)(	\
+static int CONCATENATE(GENL_MAGIC_FAMILY, _genl_multicast_ ## group)(	\
 	struct sk_buff *skb, gfp_t flags)				\
 {									\
 	unsigned int group_id =						\
-		CONCAT_(GENL_MAGIC_FAMILY, _group_ ## group);		\
+		CONCATENATE(GENL_MAGIC_FAMILY, _group_ ## group);		\
 	return genlmsg_multicast(&ZZZ_genl_family, skb, 0,		\
 				 group_id, flags);			\
 }
@@ -289,8 +290,8 @@ static struct genl_family ZZZ_genl_family __ro_after_init = {
 #ifdef GENL_MAGIC_FAMILY_HDRSZ
 	.hdrsize = NLA_ALIGN(GENL_MAGIC_FAMILY_HDRSZ),
 #endif
-	.maxattr = ARRAY_SIZE(CONCAT_(GENL_MAGIC_FAMILY, _tla_nl_policy))-1,
-	.policy	= CONCAT_(GENL_MAGIC_FAMILY, _tla_nl_policy),
+	.maxattr = ARRAY_SIZE(CONCATENATE(GENL_MAGIC_FAMILY, _tla_nl_policy))-1,
+	.policy	= CONCATENATE(GENL_MAGIC_FAMILY, _tla_nl_policy),
 	.ops = ZZZ_genl_ops,
 	.n_ops = ARRAY_SIZE(ZZZ_genl_ops),
 	.mcgrps = ZZZ_genl_mcgrps,
@@ -299,12 +300,12 @@ static struct genl_family ZZZ_genl_family __ro_after_init = {
 	.module = THIS_MODULE,
 };
 
-int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void)
+int CONCATENATE(GENL_MAGIC_FAMILY, _genl_register)(void)
 {
 	return genl_register_family(&ZZZ_genl_family);
 }
 
-void CONCAT_(GENL_MAGIC_FAMILY, _genl_unregister)(void)
+void CONCATENATE(GENL_MAGIC_FAMILY, _genl_unregister)(void)
 {
 	genl_unregister_family(&ZZZ_genl_family);
 }

include/linux/genl_magic_struct.h

@@ -14,14 +14,12 @@
 # error "you need to define GENL_MAGIC_INCLUDE_FILE before inclusion"
 #endif
 
+#include <linux/args.h>
 #include <linux/genetlink.h>
 #include <linux/types.h>
 
-#define CONCAT__(a,b)	a ## b
-#define CONCAT_(a,b)	CONCAT__(a,b)
-
-extern int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void);
-extern void CONCAT_(GENL_MAGIC_FAMILY, _genl_unregister)(void);
+extern int CONCATENATE(GENL_MAGIC_FAMILY, _genl_register)(void);
+extern void CONCATENATE(GENL_MAGIC_FAMILY, _genl_unregister)(void);
 
 /*
  * Extension of genl attribute validation policies			{{{2