[LTP] [PATCH v4 1/2] pty04: Use guarded buffers for transmission

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> Hi Jan,
> 
> > > > > Probably the best thing todo for now is to remove the test before the
> > > > > release as this requires some more investigation.
> 
> > > > We can keep it in tree, I'd just disable it in runtest file(s), so it's
> > > > not
> > > > run by default.
> 
> 
> > > But we still facing the compiled errors in the old kernels, that will
> > > break
> > > the LTP build in the compiling phase.
> 
> > I see, that will fail on anything older than 4.10. I don't have strong
> > preference how to deal with that, just want to avoid running pty04 for now.
> 
> > diff --git a/testcases/kernel/pty/pty04.c b/testcases/kernel/pty/pty04.c
> > index eaf172504a64..55923a0af006 100644
> > --- a/testcases/kernel/pty/pty04.c
> > +++ b/testcases/kernel/pty/pty04.c
> > @@ -38,7 +38,10 @@
> >  #include "tst_buffers.h"
> >  #include "config.h"
> 
> > -#if defined(HAVE_LINUX_IF_PACKET_H) && defined(HAVE_LINUX_IF_ETHER_H)
> > +#include <linux/version.h>
> Shouldn't we also check for <linux/version.h> with autotools? Or are kernel
> headers mandatory for LTP build?

We already include this header in some syscalls tests, so I assumed it won't be an issue.

> 
> > +
> > +#if defined(HAVE_LINUX_IF_PACKET_H) && defined(HAVE_LINUX_IF_ETHER_H) \
> > +       && LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
> 
> >  #include <linux/if_packet.h>
> >  #include <linux/if_ether.h>
> > @@ -373,6 +376,6 @@ static struct tst_test test = {
> 
> >  #else
> 
> > -TST_TEST_TCONF("Need <linux/if_packet.h> and <linux/if_ether.h>");
> > +TST_TEST_TCONF("Need <linux/if_packet.h> and <linux/if_ether.h> and
> > 4.10+");
> 
> +1.
> 
> BTW, why this tests requires 4.10 for runtime?

It's for compilation. struct can_frame fields it's using were introduced in 4.10.