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This prepares the ground for extending features covered by the meta-page. Cc: Shuah Khan Cc: linux-kselftest@vger.kernel.org Signed-off-by: Vincent Donnefort diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing= /selftests/ring-buffer/map_test.c index ba12fd31de87..d10a847130fb 100644 Acked-by: Shuah Khan Acked-by: Steven Rostedt (Google) --- a/tools/testing/selftests/ring-buffer/map_test.c +++ b/tools/testing/selftests/ring-buffer/map_test.c @@ -92,12 +92,22 @@ int tracefs_cpu_map(struct tracefs_cpu_map_desc *desc, = int cpu) if (desc->cpu_fd < 0) return -ENODEV; =20 +again: map =3D mmap(NULL, page_size, PROT_READ, MAP_SHARED, desc->cpu_fd, 0); if (map =3D=3D MAP_FAILED) return -errno; =20 desc->meta =3D (struct trace_buffer_meta *)map; =20 + /* the meta-page is bigger than the original mapping */ + if (page_size < desc->meta->meta_struct_len) { + int meta_page_size =3D desc->meta->meta_page_size; + + munmap(desc->meta, page_size); + page_size =3D meta_page_size; + goto again; + } + return 0; } =20 --=20 2.46.0.598.g6f2099f65c-goog