On Fri, Oct 22, 2021 at 8:06 AM Catalin Marinas <catalin.marinas@xxxxxxx> wrote:
>
> Probing only the first byte(s) in fault_in() would be ideal, no need to
> go through all filesystems and try to change the uaccess/probing order.
Let's try that. Or rather: probing just the first page - since there
are users like that btrfs ioctl, and the direct-io path.
Linus
