On Tue, May 25, 2021 at 9:40 AM Olivier Langlois <olivier@xxxxxxxxxxxxxx> wrote:
>
> If I look in the create_io_thread() function, I can see that CLONE_VM
> isn't set...
That would indeed be horribly buggy, but I'm not seeing it:
.flags = ((lower_32_bits(flags) | CLONE_VM |
CLONE_UNTRACED) & ~CSIGNAL),
Yeah, it has that odd "first create 'flags' without the CLONE_VM, but
that is only used for that
lower_32_bits(flags)
thing, and then we explicitly add CLONE_VM in there in the actual
kernel_clone_args.
It's because of how 'kernel_thread()' is written (that has historical
reasons), and the oddity is copied from there.
Linus
