Commit cc18b460 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

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



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

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent f96c6f72

arch/s390/include/asm/pgtable.h

+22 −7
Original line number Diff line number Diff line
@@ -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;

}

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