linux-stable/include/linux/pkeys.h
Michael Ellerman 4414ef9536 mm/pkeys: Add an empty arch_pkeys_enabled()
Add an empty arch_pkeys_enabled() in linux/pkeys.h for the
CONFIG_ARCH_HAS_PKEYS=n case.

Split out of a patch by Ram Pai <linuxram@us.ibm.com>.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
2018-05-09 11:51:46 +10:00

53 lines
1,016 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PKEYS_H
#define _LINUX_PKEYS_H
#include <linux/mm.h>
#ifdef CONFIG_ARCH_HAS_PKEYS
#include <asm/pkeys.h>
#else /* ! CONFIG_ARCH_HAS_PKEYS */
#define arch_max_pkey() (1)
#define execute_only_pkey(mm) (0)
#define arch_override_mprotect_pkey(vma, prot, pkey) (0)
#define PKEY_DEDICATED_EXECUTE_ONLY 0
#define ARCH_VM_PKEY_FLAGS 0
static inline int vma_pkey(struct vm_area_struct *vma)
{
return 0;
}
static inline bool mm_pkey_is_allocated(struct mm_struct *mm, int pkey)
{
return (pkey == 0);
}
static inline int mm_pkey_alloc(struct mm_struct *mm)
{
return -1;
}
static inline int mm_pkey_free(struct mm_struct *mm, int pkey)
{
return -EINVAL;
}
static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
unsigned long init_val)
{
return 0;
}
static inline bool arch_pkeys_enabled(void)
{
return false;
}
static inline void copy_init_pkru_to_fpregs(void)
{
}
#endif /* ! CONFIG_ARCH_HAS_PKEYS */
#endif /* _LINUX_PKEYS_H */