[PATCH] Add __private_ss to s390 struct tcbhead.

[Stefan Liebler]

This is okay for s390.

Adhemerval, is this okay for 2.23?

It is needed to enable split-stack support on s390 (See gcc bug #68191).

Bye Stefan

On 01/02/2016 05:34 PM, Marcin Kościelnicki wrote:
> Preparation for gcc -fsplit-stack support (gcc bug #68191).  The new
> field is basically identical to the one on x86.  Its TCB offset needs
> to be constant, as it'll be hardcoded in gcc.
>
> 	* sysdeps/s390/nptl/tls.h: Add __private_ss to struct tcbhead.
> ---
>   ChangeLog               | 4 ++++
>   sysdeps/s390/nptl/tls.h | 4 ++++
>   2 files changed, 8 insertions(+)
>
> diff --git a/ChangeLog b/ChangeLog
> index 8c339d2..e39e2ce 100644
> --- a/ChangeLog
> +++ b/ChangeLog
> @@ -1,3 +1,7 @@
> +2015-01-02  Marcin Kościelnicki  <koriakin@0x04.net>
> +
> +	* sysdeps/s390/nptl/tls.h: Add __private_ss to struct tcbhead.
> +
>   2016-01-01  Mike Frysinger  <vapier@gentoo.org>
>
>   	[BZ #15421]
> diff --git a/sysdeps/s390/nptl/tls.h b/sysdeps/s390/nptl/tls.h
> index 28a2119..0e61154 100644
> --- a/sysdeps/s390/nptl/tls.h
> +++ b/sysdeps/s390/nptl/tls.h
> @@ -53,7 +53,11 @@ typedef struct
>     int gscope_flag;
>   #ifndef __ASSUME_PRIVATE_FUTEX
>     int private_futex;
> +#else
> +  int __glibc_reserved1;
>   #endif
> +  /* GCC split stack support.  */
> +  void *__private_ss;
>   } tcbhead_t;
>
>   # ifndef __s390x__
>