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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-05-09 11:05:45 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-05-09 11:05:45 +0200 |
| commit | b91a333ecb223a4bb104ff5a64c9ee5a194789a3 (patch) | |
| tree | c69a7cbebf77b7c3736d6a30106f5c29a25aa871 /sysdeps/unix/sysv/linux | |
| parent | a9558b49b3336aba143b68279af90d69e2d92479 (diff) | |
| download | glibc-b91a333ecb223a4bb104ff5a64c9ee5a194789a3.tar glibc-b91a333ecb223a4bb104ff5a64c9ee5a194789a3.tar.gz glibc-b91a333ecb223a4bb104ff5a64c9ee5a194789a3.tar.bz2 glibc-b91a333ecb223a4bb104ff5a64c9ee5a194789a3.zip | |
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/unix/sysv/linux')
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/init-first.c | 6 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/libc-vdso.h | 2 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h | 1 |
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 */ |