arch/x86/include/asm/pkeys.h

#ifndef _ASM_X86_PKEYS_H
#define _ASM_X86_PKEYS_H

#define arch_max_pkey() (boot_cpu_has(X86_FEATURE_OSPKE) ? 16 : 1)

extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
		unsigned long init_val);

#endif /*_ASM_X86_PKEYS_H */