Re: [PATCH 02/14] rseq: Introduce restartable sequences system call (v13)

On Mon, Apr 30, 2018 at 06:44:21PM -0400, Mathieu Desnoyers wrote:

Expose a new system call allowing each thread to register one userspace
memory area to be used as an ABI between kernel and user-space for two
purposes: user-space restartable sequences and quick access to read the
current CPU number value from user-space.

---
 MAINTAINERS                 |  11 ++
 arch/Kconfig                |   7 +
 fs/exec.c                   |   1 +
 include/linux/sched.h       | 134 +++++++++++++++++
 include/linux/syscalls.h    |   4 +-
 include/trace/events/rseq.h |  57 +++++++
 include/uapi/linux/rseq.h   | 133 +++++++++++++++++
 init/Kconfig                |  23 +++
 kernel/Makefile             |   1 +
 kernel/fork.c               |   2 +
 kernel/rseq.c               | 357 ++++++++++++++++++++++++++++++++++++++++++++
 kernel/sched/core.c         |   2 +
 kernel/sys_ni.c             |   3 +
 13 files changed, 734 insertions(+), 1 deletion(-)
 create mode 100644 include/trace/events/rseq.h
 create mode 100644 include/uapi/linux/rseq.h
 create mode 100644 kernel/rseq.c

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>