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s390/pgtable: add pgste_get helper

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ptep_modify_prot_start uses the pgste_set helper to store the pgste,
while ptep_modify_prot_commit uses its own pointer magic to retrieve
the value again. Add the pgste_get help function to keep things
symmetrical and improve readability.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2013-07-19 11:15:54 +02:00
parent a055f66a3a
commit d56c893d36
1 changed files with 10 additions and 1 deletions
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11
arch/s390/include/asm/pgtable.h
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@ -619,6 +619,15 @@ static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
#endif
}
static inline pgste_t pgste_get(pte_t *ptep)
{
unsigned long pgste = 0;
#ifdef CONFIG_PGSTE
pgste = *(unsigned long *)(ptep + PTRS_PER_PTE);
#endif
return __pgste(pgste);
}
static inline void pgste_set(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
@ -1098,7 +1107,7 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm,
pgste_t pgste;
if (mm_has_pgste(mm)) {
pgste = *(pgste_t *)(ptep + PTRS_PER_PTE);
pgste = pgste_get(ptep);
pgste_set_key(ptep, pgste, pte);
pgste_set_pte(ptep, pte);
pgste_set_unlock(ptep, pgste);