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b91a333ecb
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.
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* Initialization code run first thing by the ELF startup code. Linux/s390.
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Copyright (C) 2008-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef SHARED
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# include <dl-vdso.h>
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# include <libc-vdso.h>
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long int (*VDSO_SYMBOL(gettimeofday)) (struct timeval *, void *)
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attribute_hidden;
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long int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *)
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__attribute__ ((nocommon));
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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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{
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PREPARE_VERSION (linux2629, "LINUX_2.6.29", 123718585);
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void *p = _dl_vdso_vsym ("__kernel_gettimeofday", &linux2629);
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PTR_MANGLE (p);
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VDSO_SYMBOL (gettimeofday) = p;
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p = _dl_vdso_vsym ("__kernel_clock_gettime", &linux2629);
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PTR_MANGLE (p);
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VDSO_SYMBOL (clock_gettime) = p;
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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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#endif
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#include <csu/init-first.c>
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