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

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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: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2022-02-21 21:18:29 +01:00 committed by Vasily Gorbik
parent e2aaae2d36
commit f29111f117
1 changed files with 30 additions and 0 deletions
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30
arch/s390/include/asm/pgtable.h
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@ -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