tests: add igt_subtest_f for snprintf'ing testnames

Useful when stitching together combinatorial testnames.

v2:
- ## rules are just fun. We need 2 indirections to actually get
  __LINE__ to properly expand.
- Kill stray ; which botched the logic.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 8 deletions

diff --git a/tests/gem_partial_pwrite_pread.c b/tests/gem_partial_pwrite_pread.c
index ce2f1c81..814c552b 100644
--- a/tests/gem_partial_pwrite_pread.c
+++ b/tests/gem_partial_pwrite_pread.c
@@ -254,21 +254,16 @@ static void test_partial_read_writes(void)
 
 static void do_tests(int cache_level, const char *suffix)
 {
-	char name[80];
-
 	if (cache_level != -1)
 		gem_set_caching(fd, scratch_bo->handle, cache_level);
 
-	snprintf(name, sizeof(name), "reads%s", suffix);
-	igt_subtest(name)
+	igt_subtest_f("reads%s", suffix)
 		test_partial_reads();
 
-	snprintf(name, sizeof(name), "writes%s", suffix);
-	igt_subtest(name)
+	igt_subtest_f("write%s", suffix)
 		test_partial_writes();
 
-	snprintf(name, sizeof(name), "writes-after-reads%s", suffix);
-	igt_subtest(name)
+	igt_subtest_f("writes-after-reads%s", suffix)
 		test_partial_read_writes();
 }