Commit f29111f1 authored by Heiko Carstens's avatar Heiko Carstens Committed by Vasily Gorbik
Browse files

s390/mm: add set_pte_bit()/clear_pte_bit() helper functions 



Add set_pte_bit()/clear_pte_bit() and set_pXd_bit()/clear_pXd_bit
helper functions which are supposed to be used if bits within
ptes/pXds are set/cleared.
The only point of these helper functions is to get more readable
code. This is quite similar to what arm64 has.

Reviewed-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent e2aaae2d

arch/s390/include/asm/pgtable.h

+30 −0
Original line number Diff line number Diff line
@@ -538,6 +538,36 @@ static inline int mm_alloc_pgste(struct mm_struct *mm) 
	return 0;

}



static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)

{

	return __pte(pte_val(pte) & ~pgprot_val(prot));

}



static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)

{

	return __pte(pte_val(pte) | pgprot_val(prot));

}



static inline pmd_t clear_pmd_bit(pmd_t pmd, pgprot_t prot)

{

	return __pmd(pmd_val(pmd) & ~pgprot_val(prot));

}



static inline pmd_t set_pmd_bit(pmd_t pmd, pgprot_t prot)

{

	return __pmd(pmd_val(pmd) | pgprot_val(prot));

}



static inline pud_t clear_pud_bit(pud_t pud, pgprot_t prot)

{

	return __pud(pud_val(pud) & ~pgprot_val(prot));

}



static inline pud_t set_pud_bit(pud_t pud, pgprot_t prot)

{

	return __pud(pud_val(pud) | pgprot_val(prot));

}



/*

 * In the case that a guest uses storage keys

 * faults should no longer be backed by zero pages