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S390: Add support for vdso getcpu symbol.

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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.
This commit is contained in:
Stefan Liebler
2016-05-09 11:05:45 +02:00
parent a9558b49b3
commit b91a333ecb
5 changed files with 21 additions and 0 deletions
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6
sysdeps/unix/sysv/linux/s390/init-first.c
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@@ -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