[PATCH v2 2/2] test/cbpf_filter: fix build when openat2.h is not available

[Yang Xiuwei <yangxiuwei@kylinos.cn>]

cbpf_filter.c included <linux/openat2.h> for struct open_how and
RESOLVE_IN_ROOT, so the test failed to build on systems without that
header (e.g. older distros). liburing's compat already provides
struct open_how; add a fallback #define for RESOLVE_IN_ROOT (0x10)
when the header is missing, so the test both builds and runs on
old headers with a current kernel.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
---
 test/cbpf_filter.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/test/cbpf_filter.c b/test/cbpf_filter.c
index 41fd284e..b80b1503 100644
--- a/test/cbpf_filter.c
+++ b/test/cbpf_filter.c
@@ -15,12 +15,15 @@
 #include <sys/wait.h>
 #include <sys/prctl.h>
 #include <linux/filter.h>
-#include <linux/openat2.h>
 
 #include "liburing.h"
 #include "liburing/io_uring/bpf_filter.h"
 #include "helpers.h"
 
+#ifndef RESOLVE_IN_ROOT
+#define RESOLVE_IN_ROOT	0x10
+#endif
+
 /*
  * cBPF filter context layout (struct io_uring_bpf_ctx):
  *   offset 0:  user_data (u64)
-- 
2.25.1