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7158fc54b2
The cache parameter of getcpu() is useless nowadays for various reasons. * It is never passed by userspace for either the vDSO or syscalls. * It is never used by the kernel. * It could not be made to work on the current vDSO architecture. * The structure definition is not part of the UAPI headers. * vdso_getcpu() is superseded by restartable sequences in any case. Remove the struct and its header. As a side-effect this gets rid of an unwanted inclusion of the linux/ header namespace from vDSO code. [ tglx: Adapt to s390 upstream changes */ Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@kernel.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Heiko Carstens <hca@linux.ibm.com> # s390 Link: https://patch.msgid.link/20251230-getcpu_cache-v3-1-fb9c5f880ebe@linutronix.de
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu()
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*
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* Copyright (c) 2020 Arm Ltd
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*/
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#include <stdint.h>
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#include <elf.h>
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#include <stdio.h>
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#include <sys/auxv.h>
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#include <sys/time.h>
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#include "kselftest.h"
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#include "parse_vdso.h"
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#include "vdso_config.h"
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#include "vdso_call.h"
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typedef long (*getcpu_t)(unsigned int *, unsigned int *, void *);
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int main(int argc, char **argv)
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{
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const char *version = versions[VDSO_VERSION];
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const char **name = (const char **)&names[VDSO_NAMES];
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unsigned long sysinfo_ehdr;
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unsigned int cpu, node;
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getcpu_t get_cpu;
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long ret;
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sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
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if (!sysinfo_ehdr) {
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printf("AT_SYSINFO_EHDR is not present!\n");
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return KSFT_SKIP;
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}
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vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
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get_cpu = (getcpu_t)vdso_sym(version, name[4]);
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if (!get_cpu) {
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printf("Could not find %s\n", name[4]);
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return KSFT_SKIP;
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}
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ret = VDSO_CALL(get_cpu, 3, &cpu, &node, 0);
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if (ret == 0) {
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printf("Running on CPU %u node %u\n", cpu, node);
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} else {
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printf("%s failed\n", name[4]);
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return KSFT_FAIL;
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}
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return 0;
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}
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