perf trace: Introduce SCA_SOCKADDR_FROM_USER() to set .from_user = true

Paving the way for the generic BPF BTF based syscall arg augmenter.

Cc: Adrian Hunter <[e-mail]>
Cc: Howard Chu <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-trace.c

···
 		   [1] = { .scnprintf = SCA_PTR, /* arg2 */ }, }, },
 	{ .name	    = "bind",
 	  .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
-		   [1] = { .scnprintf = SCA_SOCKADDR, /* umyaddr */ },
+		   [1] = SCA_SOCKADDR_FROM_USER(umyaddr),
 		   [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
 	{ .name	    = "bpf",
 	  .arg = { [0] = STRARRAY(cmd, bpf_cmd), }, },
···
 	  .arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },
 	{ .name	    = "connect",
 	  .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
-		   [1] = { .scnprintf = SCA_SOCKADDR, /* servaddr */ },
+		   [1] = SCA_SOCKADDR_FROM_USER(servaddr),
 		   [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
 	{ .name	    = "epoll_ctl",
 	  .arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },
···
 	  .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
 	{ .name	    = "sendto",
 	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ },
-		   [4] = { .scnprintf = SCA_SOCKADDR, /* addr */ }, }, },
+		   [4] = SCA_SOCKADDR_FROM_USER(addr), }, },
 	{ .name	    = "set_tid_address", .errpid = true, },
 	{ .name	    = "setitimer",
 	  .arg = { [0] = STRARRAY(which, itimers), }, },

tools/perf/trace/beauty/beauty.h

···
 size_t syscall_arg__scnprintf_sockaddr(char *bf, size_t size, struct syscall_arg *arg);
 #define SCA_SOCKADDR syscall_arg__scnprintf_sockaddr
 
+// 'argname' is just documentational at this point, to remove the previous comment with that info
+#define SCA_SOCKADDR_FROM_USER(argname) \
+	  { .scnprintf	= SCA_SOCKADDR, \
+	    .from_user	= true, }
+
 size_t syscall_arg__scnprintf_socket_protocol(char *bf, size_t size, struct syscall_arg *arg);
 #define SCA_SK_PROTO syscall_arg__scnprintf_socket_protocol