Re: [man-pages PATCH 2/5] s390_runtime_instr.2: document the removal of the second argument

[Heiko Carstens <heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>]

On Wed, Jan 31, 2018 at 08:41:39AM +0000, Eugene Syromyatnikov wrote:
> On Wed, Jan 31, 2018 at 7:20 AM, Heiko Carstens
> <heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org> wrote:
> > @@ -85,6 +91,12 @@ The run-time instrumentation facility is available beginning with System z EC12.
> >  Glibc does not provide a wrapper for this system call, use
> >  .BR syscall (2)
> >  to call it.
> > +.PP
> > +Support for signalling was removed with Linux 4.4. With Linux 4.4
> > +also the check if
> > +.IR signum
> > +is a valid real-time signal was removed. For backwards compatibility with old
> > +kernels it is recommended to pass a valid real-time signal number.
> I would recommend passing 0 instead, as passing non-zero signal number
> implies that the userspace process expects to receive this signal in
> the future in case of aforementioned events, and this will not happen
> on Linux 4.4 onwards.

Passing 0 as signum is not backwards compatible, since that will result in
an error with old kernels.

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