[PATCH v2] selftests/seccomp: Unconditionally define seccomp_metadata

[Luke Nowakowski-Krijger]

Unconditonally define seccomp_metadata and remove the linux/ptrace.h
include.

There are conflicts between glibc system headers sys/ptrace.h and
linux/ptrace.h that can likely cause seccomp_metadata to not be
defined depending on what system header versions are installed,
leading to compile errors. This fix makes this test more likely to
compile on a wider variety of systems.

Signed-off-by: Luke Nowakowski-Krijger <luke.nowakowskikrijger@xxxxxxxxxxxxx>
---
v2 + resend: 
Added comment to explain why there is a header definiton being
defined in the file and to suggest to future developers that they
might have to do the same for future fixes for definition issues like
this.

 tools/testing/selftests/seccomp/seccomp_bpf.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/selftests/seccomp/seccomp_bpf.c
index d425688cf59c..19d0b448511c 100644
--- a/tools/testing/selftests/seccomp/seccomp_bpf.c
+++ b/tools/testing/selftests/seccomp/seccomp_bpf.c
@@ -26,7 +26,6 @@
 #include <sys/ptrace.h>
 #include <sys/user.h>
 #include <linux/prctl.h>
-#include <linux/ptrace.h>
 #include <linux/seccomp.h>
 #include <pthread.h>
 #include <semaphore.h>
@@ -171,12 +170,17 @@ struct seccomp_data {
 
 #ifndef PTRACE_SECCOMP_GET_METADATA
 #define PTRACE_SECCOMP_GET_METADATA	0x420d
+#endif
 
+/*
+ * There are conflicting definitions in ptrace system headers that lead to
+ * struct seccomp_metadata to not be defined. So until those conflicts get
+ * sorted out, we should rely on some of our own in-tree ptrace definitions.
+ */
 struct seccomp_metadata {
 	__u64 filter_off;       /* Input: which filter */
 	__u64 flags;             /* Output: filter's flags */
 };
-#endif
 
 #ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER
 #define SECCOMP_FILTER_FLAG_NEW_LISTENER	(1UL << 3)
-- 
2.32.0