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.
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ChangeLog
11
ChangeLog
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@ -1,3 +1,14 @@
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2016-05-09 Stefan Liebler <stli@linux.vnet.ibm.com>
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* sysdeps/unix/sysv/linux/s390/init-first.c:
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Add VDSO_SYMBOL(getcpu).
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(_libc_vdso_platform_setup): Initialize VDSO_SYMBOL(getcpu).
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* sysdeps/unix/sysv/linux/s390/libc-vdso.h:
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Add VDSO_SYMBOL(getcpu).
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* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h:
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New define HAVE_GETCPU_VSYSCALL.
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* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h: Likewise.
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2016-05-08 H.J. Lu <hongjiu.lu@intel.com>
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* sysdeps/i386/cacheinfo.c: Include <sysdeps/x86/cacheinfo.c>
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@ -29,6 +29,8 @@ long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
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long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *)
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__attribute__ ((nocommon));
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long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
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attribute_hidden;
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static inline void
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_libc_vdso_platform_setup (void)
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@ -46,6 +48,10 @@ _libc_vdso_platform_setup (void)
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p = _dl_vdso_vsym ("__kernel_clock_getres", &linux2629);
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PTR_MANGLE (p);
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VDSO_SYMBOL (clock_getres) = p;
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p = _dl_vdso_vsym ("__kernel_getcpu", &linux2629);
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PTR_MANGLE (p);
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VDSO_SYMBOL (getcpu) = p;
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}
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# define VDSO_SETUP _libc_vdso_platform_setup
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@ -31,6 +31,8 @@ extern long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *);
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extern long int (*VDSO_SYMBOL(clock_getres)) (clockid_t, struct timespec *);
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extern long int (*VDSO_SYMBOL(getcpu)) (unsigned *, unsigned *, void *)
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attribute_hidden;
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#endif
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#endif /* _LIBC_VDSO_H */
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@ -283,6 +283,7 @@
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#define HAVE_CLOCK_GETRES_VSYSCALL 1
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#define HAVE_CLOCK_GETTIME_VSYSCALL 1
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#define HAVE_GETTIMEOFDAY_VSYSCALL 1
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#define HAVE_GETCPU_VSYSCALL 1
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/* This version is for internal uses when there is no desire
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to set errno */
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@ -289,6 +289,7 @@
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#define HAVE_CLOCK_GETRES_VSYSCALL 1
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#define HAVE_CLOCK_GETTIME_VSYSCALL 1
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#define HAVE_GETTIMEOFDAY_VSYSCALL 1
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#define HAVE_GETCPU_VSYSCALL 1
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/* This version is for internal uses when there is no desire
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to set errno */
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