tools headers: Sync uapi/linux/fcntl.h with the kernel source

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@kernel.org>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/trace/beauty/include/uapi/linux/fcntl.h b/tools/perf/trace/beauty/include/uapi/linux/fcntl.h
index a15ac2fa4b202fa0f9d8350e347dbc2560a1c08b..f291ab4f94ebccacfd966de03a08c4948aa89e60 100644 (file)
--- 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. */