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Re: S390: Add support for vdso getcpu symbol.

From: Stefan Liebler <stli at linux dot vnet dot ibm dot com>
To: libc-alpha at sourceware dot org
Date: Wed, 4 May 2016 15:15:20 +0200
Subject: Re: S390: Add support for vdso getcpu symbol.
Authentication-results: sourceware.org; auth=none
References: <nfv38m$q7v$1 at ger dot gmane dot org>

ping

Any objection? Otherwise, I'll commit this patch.

On 04/29/2016 09:42 AM, Stefan Liebler wrote:

Hi,

This patch adds support for symbol __kernel_getcpu in vDSO,
which is available with kernel 4.5.
Now sched_getcpu is using this symbol if available in mapped vDSO
by defining macro HAVE_GETCPU_VSYSCALL. If not available at runtime,
the former syscall is used.

Bye
Stefan

ChangeLog:

     * sysdeps/unix/sysv/linux/s390/init-first.c:
     Add VDSO_SYMBOL(getcpu).
     (_libc_vdso_platform_setup): Initialize VDSO_SYMBOL(getcpu).
     * sysdeps/unix/sysv/linux/s390/libc-vdso.h:
     Add VDSO_SYMBOL(getcpu).
     * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h:
     New define HAVE_GETCPU_VSYSCALL.
     * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h: Likewise.

Follow-Ups:
- Re: S390: Add support for vdso getcpu symbol.
  - From: Adhemerval Zanella

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