Re: [PATCH] userfaultfd: register syscall numbers for x86 32bit and x86-64 64bit

* Ingo Molnar (mingo@kernel.org) wrote:

* Andrea Arcangeli [off-list ref] wrote:

quoted

This registers the official numbers of the userfaultfd syscall for x86
32bit and x86-64 64bit. This registration allows to ship kernels in
production using these two syscall numbers for userfaultfd.

Acked-by: Pavel Emelyanov <redacted>
Signed-off-by: Andrea Arcangeli <redacted>
---
 arch/x86/entry/syscalls/syscall_32.tbl | 1 +
 arch/x86/entry/syscalls/syscall_64.tbl | 1 +
 include/linux/syscalls.h               | 1 +
 kernel/sys_ni.c                        | 1 +
 4 files changed, 4 insertions(+)

Hm, is there consensus on the upstream desirability of this sytem call?

I hope so:
   a) It's generic enough that there's interest in using it in
      a range of projects - there's nothing QEMU specific in it.
   b) It's worked very well on the QEMU code that I wrote that uses it
      for postcopy, and has been solid doing that for many months now.
   c) I'm not aware of any suggestions for a different, generic solution
      to solve the same set of problems.
   d) It's got a good self test, that's survived heavy testing.
   e) I think Andrea has addressed all previous comments on it.

Dave

Thanks,

	Ingo

--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK