To pick up the changes in this cset:
3941e37f62fe2c3c uapi/fcntl: add FD_PIDFS_ROOT
cd5d2006327b6d84 uapi/fcntl: add FD_INVALID
67fcec2919e4ed31 fcntl/pidfd: redefine PIDFD_SELF_THREAD_GROUP
a4c746f06853f91d uapi/fcntl: mark range as reserved
This addresses these perf build warnings:
Warning: Kernel ABI header differences:
diff -u tools/perf/trace/beauty/include/uapi/linux/fcntl.h include/uapi/linux/fcntl.h
Please see tools/include/uapi/README for further details.
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
.../trace/beauty/include/uapi/linux/fcntl.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/tools/perf/trace/beauty/include/uapi/linux/fcntl.h b/tools/perf/trace/beauty/include/uapi/linux/fcntl.h
index a15ac2fa4b202fa0..f291ab4f94ebccac 100644
--- a/tools/perf/trace/beauty/include/uapi/linux/fcntl.h
+++ b/tools/perf/trace/beauty/include/uapi/linux/fcntl.h
@@ -90,10 +90,28 @@
#define DN_ATTRIB 0x00000020 /* File changed attibutes */
#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
+/* Reserved kernel ranges [-100], [-10000, -40000]. */
#define AT_FDCWD -100 /* Special value for dirfd used to
indicate openat should use the
current working directory. */
+/*
+ * The concept of process and threads in userland and the kernel is a confusing
+ * one - within the kernel every thread is a 'task' with its own individual PID,
+ * however from userland's point of view threads are grouped by a single PID,
+ * which is that of the 'thread group leader', typically the first thread
+ * spawned.
+ *
+ * To cut the Gideon knot, for internal kernel usage, we refer to
+ * PIDFD_SELF_THREAD to refer to the current thread (or task from a kernel
+ * perspective), and PIDFD_SELF_THREAD_GROUP to refer to the current thread
+ * group leader...
+ */
+#define PIDFD_SELF_THREAD -10000 /* Current thread. */
+#define PIDFD_SELF_THREAD_GROUP -10001 /* Current thread group leader. */
+
+#define FD_PIDFS_ROOT -10002 /* Root of the pidfs filesystem */
+#define FD_INVALID -10009 /* Invalid file descriptor: -10000 - EBADF = -10009 */
/* Generic flags for the *at(2) family of syscalls. */
--
2.51.0.261.g7ce5a0a67e-goog
