Re: [PATCH v2 2/6] userfaultfd: add /dev/userfaultfd for fine grained access control

On Fri, Apr 22, 2022 at 02:29:41PM -0700, Axel Rasmussen wrote: [...]

--- a/include/uapi/linux/userfaultfd.h +++ b/include/uapi/linux/userfaultfd.h @@ -12,6 +12,10 @@ #include <linux/types.h> +/* ioctls for /dev/userfaultfd */ +#define USERFAULTFD_IOC 0xAA +#define USERFAULTFD_IOC_NEW _IOWR(USERFAULTFD_IOC, 0x00, int)

Why this new ioctl is defined using _IOWR()? Since it neither reads from user memory nor writes into user memory, it should rather be defined using _IO(), shouldn't it?