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/usr/include/x86_64-linux-gnu/asm/prctl.h is in linux-libc-dev 4.15.0-20.21.

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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_X86_PRCTL_H
#define _ASM_X86_PRCTL_H

#define ARCH_SET_GS		0x1001
#define ARCH_SET_FS		0x1002
#define ARCH_GET_FS		0x1003
#define ARCH_GET_GS		0x1004

#define ARCH_GET_CPUID		0x1011
#define ARCH_SET_CPUID		0x1012

#define ARCH_MAP_VDSO_X32	0x2001
#define ARCH_MAP_VDSO_32	0x2002
#define ARCH_MAP_VDSO_64	0x2003

#endif /* _ASM_X86_PRCTL_H */