selftests/ring-buffer: Handle meta-page bigger than the system

Handle the case where the meta-page content is bigger than the system
page-size. This prepares the ground for extending features covered by
the meta-page.

Cc: Shuah Khan <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/[e-mail]
Acked-by: Shuah Khan <[e-mail]>
Signed-off-by: Vincent Donnefort <[e-mail]>
Signed-off-by: Steven Rostedt (Google) <[e-mail]>

tools/testing/selftests/ring-buffer/map_test.c

···
 	if (desc->cpu_fd < 0)
 		return -ENODEV;
 
+again:
 	map = mmap(NULL, page_size, PROT_READ, MAP_SHARED, desc->cpu_fd, 0);
 	if (map == MAP_FAILED)
 		return -errno;
 
 	desc->meta = (struct trace_buffer_meta *)map;
+
+	/* the meta-page is bigger than the original mapping */
+	if (page_size < desc->meta->meta_struct_len) {
+		int meta_page_size = desc->meta->meta_page_size;
+
+		munmap(desc->meta, page_size);
+		page_size = meta_page_size;
+		goto again;
+	}
 
 	return 0;
 }