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authorStefan Liebler <stli@linux.vnet.ibm.com>2016-05-09 11:05:45 +0200
committerStefan Liebler <stli@linux.vnet.ibm.com>2016-05-09 11:05:45 +0200
commitb91a333ecb223a4bb104ff5a64c9ee5a194789a3 (patch)
treec69a7cbebf77b7c3736d6a30106f5c29a25aa871 /sysdeps
parenta9558b49b3336aba143b68279af90d69e2d92479 (diff)
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S390: Add support for vdso getcpu symbol.
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.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/unix/sysv/linux/s390/init-first.c6
-rw-r--r--sysdeps/unix/sysv/linux/s390/libc-vdso.h2
-rw-r--r--sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h1
-rw-r--r--sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h1
4 files changed, 10 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/s390/init-first.c b/sysdeps/unix/sysv/linux/s390/init-first.c
index d3a20fda30..7498cbe007 100644
--- a/sysdeps/unix/sysv/linux/s390/init-first.c
+++ b/sysdeps/unix/sysv/linux/s390/init-first.c
@@ -29,6 +29,8 @@ long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
 long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
   __attribute__ ((nocommon));
 
+long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
+   attribute_hidden;
 
 static inline void
 _libc_vdso_platform_setup (void)
@@ -46,6 +48,10 @@ _libc_vdso_platform_setup (void)
   p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2629);
   PTR_MANGLE (p);
   VDSO_SYMBOL (clock_getres) = p;
+
+  p = _dl_vdso_vsym ("__kernel_getcpu", &linux2629);
+  PTR_MANGLE (p);
+  VDSO_SYMBOL (getcpu) = p;
 }
 
 # define VDSO_SETUP _libc_vdso_platform_setup
diff --git a/sysdeps/unix/sysv/linux/s390/libc-vdso.h b/sysdeps/unix/sysv/linux/s390/libc-vdso.h
index d2a83161bb..512b3ba307 100644
--- a/sysdeps/unix/sysv/linux/s390/libc-vdso.h
+++ b/sysdeps/unix/sysv/linux/s390/libc-vdso.h
@@ -31,6 +31,8 @@ extern long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *);
 
 extern long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *);
 
+extern long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
+   attribute_hidden;
 #endif
 
 #endif /* _LIBC_VDSO_H */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
index 3540416e0e..651e1ee40c 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
@@ -283,6 +283,7 @@
 #define HAVE_CLOCK_GETRES_VSYSCALL	1
 #define HAVE_CLOCK_GETTIME_VSYSCALL	1
 #define HAVE_GETTIMEOFDAY_VSYSCALL	1
+#define HAVE_GETCPU_VSYSCALL		1
 
 /* This version is for internal uses when there is no desire
    to set errno */
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
index 6f390ff626..702b0b6a44 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
@@ -289,6 +289,7 @@
 #define HAVE_CLOCK_GETRES_VSYSCALL	1
 #define HAVE_CLOCK_GETTIME_VSYSCALL	1
 #define HAVE_GETTIMEOFDAY_VSYSCALL	1
+#define HAVE_GETCPU_VSYSCALL		1
 
 /* This version is for internal uses when there is no desire
    to set errno */