Re: [PATCH] m68k: Wire up clone3() syscall

[Christian Brauner]

On Mon, Jan 13, 2020 at 10:34:35AM +0100, Geert Uytterhoeven wrote:
> Hi Christian,
> 
> On Mon, Jan 13, 2020 at 10:18 AM Christian Brauner
> <christian.brauner@xxxxxxxxxx> wrote:
> > On Mon, Jan 13, 2020 at 10:10:26AM +0100, Geert Uytterhoeven wrote:
> > > On Sun, Jan 12, 2020 at 5:06 PM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > > > On Sun, Nov 24, 2019 at 8:52 PM Kars de Jong <jongk@xxxxxxxxxxxxxx> wrote:
> > > > > Wire up the clone3() syscall for m68k. The special entry point is done in
> > > > > assembler as was done for clone() as well. This is needed because all
> > > > > registers need to be saved. The C wrapper then calls the generic
> > > > > sys_clone3() with the correct arguments.
> > > > >
> > > > > Tested on A1200 using the simple test program from:
> > > > >
> > > > >   https://lore.kernel.org/lkml/20190716130631.tohj4ub54md25dys@xxxxxxxxxx/
> > > > >
> > > > > Cc: linux-m68k@xxxxxxxxxxxxxxx
> > > > > Signed-off-by: Kars de Jong <jongk@xxxxxxxxxxxxxx>
> > > >
> > > > Thanks, applied and queued for v5.6.
> > >
> > > Which is now broken because of commit dd499f7a7e342702 ("clone3: ensure
> > > copy_thread_tls is implemented") in v5.5-rc6 :-(
> >
> > Sorry, just for clarification what and how is it broken by
> > dd499f7a7e342702 ("clone3: ensure > copy_thread_tls is implemented")
> > ?
> 
> Because m68k does not implement copy_thread_tls() yet, and doesn't
> select HAVE_COPY_THREAD_TLS yet.

Oh right, sorry. I forgot that m68k has a patchset to enable clone3() up
for merging. I should've remembered that and warned you that we will
have to require copy_thread_tls() going forward. I hope the merge is
explanatory enough why we're doing it this way.

> 
> Looking into fixing that...

Thank you! Much appreciated!
Christian