From: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date: Wed, 13 Mar 2013 13:46:08 +0000 (-0300)
Subject: PowerPC: Change sched_getcpu to use vDSO getcpu instead of syscall.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60dc6d12c5c61b05013cb15f63349dd3d343f26d;p=thirdparty%2Fglibc.git

PowerPC: Change sched_getcpu to use vDSO getcpu instead of syscall.

Backport of d5e0b9bd6e296f3ec5263fa296d39f3fed9b8fa2.
---

diff --git a/ChangeLog b/ChangeLog
index ca3e120a21d..197da7ff950 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-01-09  Anton Blanchard  <anton@samba.org>
+
+	* sysdeps/unix/sysv/linux/powerpc/sched_getcpu.c: New file.
+	* sysdeps/unix/sysv/linux/powerpc/Versions: Add __vdso_getcpu.
+	* sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h: Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/init-first.c: Likewise.
+
 2013-03-04  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
 	* sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h: Add macro to
diff --git a/sysdeps/unix/sysv/linux/powerpc/Versions b/sysdeps/unix/sysv/linux/powerpc/Versions
index 1ef53b9e9c5..396a4236c1d 100644
--- a/sysdeps/unix/sysv/linux/powerpc/Versions
+++ b/sysdeps/unix/sysv/linux/powerpc/Versions
@@ -3,5 +3,6 @@ libc {
     __vdso_get_tbfreq;
     __vdso_clock_gettime;
     __vdso_clock_getres;
+    __vdso_getcpu;
   }
 }
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h b/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
index 97979431f5a..820079fc192 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/libc-vdso.h
@@ -30,6 +30,8 @@ extern void *__vdso_clock_getres;
 
 extern void *__vdso_get_tbfreq;
 
+extern void *__vdso_getcpu;
+
 /* Macro to return vdso_xxx value on IFUNC implementations.
    On PPC64 the returned value is actually an OPD entry.  */
 #if defined(__PPC64__) || defined(__powerpc64__)
diff --git a/sysdeps/unix/sysv/linux/powerpc/init-first.c b/sysdeps/unix/sysv/linux/powerpc/init-first.c
index 57b36afc403..7e7c4def622 100644
--- a/sysdeps/unix/sysv/linux/powerpc/init-first.c
+++ b/sysdeps/unix/sysv/linux/powerpc/init-first.c
@@ -26,6 +26,7 @@ void *__vdso_gettimeofday attribute_hidden;
 void *__vdso_clock_gettime;
 void *__vdso_clock_getres;
 void *__vdso_get_tbfreq;
+void *__vdso_getcpu;
 
 
 static inline void
@@ -40,6 +41,8 @@ _libc_vdso_platform_setup (void)
   __vdso_clock_getres = _dl_vdso_vsym ("__kernel_clock_getres", &linux2615);
 
   __vdso_get_tbfreq = _dl_vdso_vsym ("__kernel_vdso_get_tbfreq", &linux2615);
+
+  __vdso_getcpu = _dl_vdso_vsym ("__kernel_getcpu", &linux2615);
 }
 
 # define VDSO_SETUP _libc_vdso_platform_setup
diff --git a/sysdeps/unix/sysv/linux/powerpc/sched_getcpu.c b/sysdeps/unix/sysv/linux/powerpc/sched_getcpu.c
new file mode 100644
index 00000000000..617e6f121f1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/sched_getcpu.c
@@ -0,0 +1,30 @@
+/* Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sched.h>
+#include <sysdep.h>
+#include <bits/libc-vdso.h>
+
+
+int
+sched_getcpu (void)
+{
+  unsigned int cpu;
+  int r = INLINE_VSYSCALL (getcpu, 3, &cpu, NULL, NULL);
+
+  return r == -1 ? r : cpu;
+}