perf trace: Introduce SCA_TIMESPEC_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

···
 	{ .name     = "clock_gettime",
 	  .arg = { [0] = STRARRAY(clk_id, clockid), }, },
 	{ .name	    = "clock_nanosleep",
-	  .arg = { [2] = { .scnprintf = SCA_TIMESPEC,  /* rqtp */ }, }, },
+	  .arg = { [2] = SCA_TIMESPEC_FROM_USER(req), }, },
 	{ .name	    = "clone",	    .errpid = true, .nr_args = 5,
 	  .arg = { [0] = { .name = "flags",	    .scnprintf = SCA_CLONE_FLAGS, },
 		   [1] = { .name = "child_stack",   .scnprintf = SCA_HEX, },
···
 	{ .name	    = "name_to_handle_at",
 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
 	{ .name	    = "nanosleep",
-	  .arg = { [0] = { .scnprintf = SCA_TIMESPEC,  /* req */ }, }, },
+	  .arg = { [0] = SCA_TIMESPEC_FROM_USER(req), }, },
 	{ .name	    = "newfstatat", .alias = "fstatat",
 	  .arg = { [0] = { .scnprintf = SCA_FDAT,	  /* dirfd */ },
 		   [1] = SCA_FILENAME_FROM_USER(pathname),

tools/perf/trace/beauty/beauty.h

···
 size_t syscall_arg__scnprintf_timespec(char *bf, size_t size, struct syscall_arg *arg);
 #define SCA_TIMESPEC syscall_arg__scnprintf_timespec
 
+// 'argname' is just documentational at this point, to remove the previous comment with that info
+#define SCA_TIMESPEC_FROM_USER(argname) \
+	  { .scnprintf	= SCA_TIMESPEC, \
+	    .from_user	= true, }
+
 size_t open__scnprintf_flags(unsigned long flags, char *bf, size_t size, bool show_prefix);
 
 void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,