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s390/mm: add p?d_folded() helper functions

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Introduce and use p?d_folded() functions to clarify the page table
code a bit more.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2017-05-20 11:43:26 +02:00 committed by Martin Schwidefsky
parent f96c6f72bc
commit cc18b460dc
1 changed files with 22 additions and 7 deletions
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29
arch/s390/include/asm/pgtable.h
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@ -563,18 +563,23 @@ static inline void crdte(unsigned long old, unsigned long new,
}
/*
* pgd/pmd/pte query functions
* pgd/p4d/pud/pmd/pte query functions
*/
static inline int pgd_folded(pgd_t pgd)
{
return (pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1;
}
static inline int pgd_present(pgd_t pgd)
{
if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1)
if (pgd_folded(pgd))
return 1;
return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
}
static inline int pgd_none(pgd_t pgd)
{
if ((pgd_val(pgd) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R1)
if (pgd_folded(pgd))
return 0;
return (pgd_val(pgd) & _REGION_ENTRY_INVALID) != 0UL;
}
@ -592,16 +597,21 @@ static inline int pgd_bad(pgd_t pgd)
return (pgd_val(pgd) & mask) != 0;
}
static inline int p4d_folded(p4d_t p4d)
{
return (p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2;
}
static inline int p4d_present(p4d_t p4d)
{
if ((p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
if (p4d_folded(p4d))
return 1;
return (p4d_val(p4d) & _REGION_ENTRY_ORIGIN) != 0UL;
}
static inline int p4d_none(p4d_t p4d)
{
if ((p4d_val(p4d) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R2)
if (p4d_folded(p4d))
return 0;
return p4d_val(p4d) == _REGION2_ENTRY_EMPTY;
}
@ -614,16 +624,21 @@ static inline unsigned long p4d_pfn(p4d_t p4d)
return (p4d_val(p4d) & origin_mask) >> PAGE_SHIFT;
}
static inline int pud_folded(pud_t pud)
{
return (pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3;
}
static inline int pud_present(pud_t pud)
{
if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
if (pud_folded(pud))
return 1;
return (pud_val(pud) & _REGION_ENTRY_ORIGIN) != 0UL;
}
static inline int pud_none(pud_t pud)
{
if ((pud_val(pud) & _REGION_ENTRY_TYPE_MASK) < _REGION_ENTRY_TYPE_R3)
if (pud_folded(pud))
return 0;
return pud_val(pud) == _REGION3_ENTRY_EMPTY;
}