fcntl/pidfd: redefine PIDFD_SELF_THREAD_GROUP

Don't jump somewhere into the middle of the reserved range. We're still
able to change that value it won't be that widely used yet. If not, we
can revert.

Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

include/uapi/linux/fcntl.h

@@ -108,7 +108,7 @@
  * group leader...
  */
 #define PIDFD_SELF_THREAD		-10000 /* Current thread. */
-#define PIDFD_SELF_THREAD_GROUP		-20000 /* Current thread group leader. */
+#define PIDFD_SELF_THREAD_GROUP		-10001 /* Current thread group leader. */
 
 
 /* Generic flags for the *at(2) family of syscalls. */

tools/testing/selftests/pidfd/pidfd.h

@@ -56,7 +56,7 @@
 #endif
 
 #ifndef PIDFD_SELF_THREAD_GROUP
-#define PIDFD_SELF_THREAD_GROUP		-20000 /* Current thread group leader. */
+#define PIDFD_SELF_THREAD_GROUP		-10001 /* Current thread group leader. */
 #endif
 
 #ifndef PIDFD_SELF