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/usr/include/x86_64-linux-gnu/asm/hwcap2.h is in linux-libc-dev 4.15.0-46.49.

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_HWCAP2_H
#define _ASM_X86_HWCAP2_H

/* MONITOR/MWAIT enabled in Ring 3 */
#define HWCAP2_RING3MWAIT		(1 << 0)

#endif