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s390/thp: respect page protection in pmd_none() and pmd_present() 

Similar to pte_none() and pte_present(), the pmd functions should also
respect page protection of huge pages, especially PROT_NONE.
This patch also simplifies massage_pgprot_pmd() by adding new definitions
for huge page protection.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Gerald Schaefer 2012-10-25 17:42:50 +02:00 committed by Martin Schwidefsky
parent 156152f84e
commit d8e7a33df0
1 changed files with 22 additions and 13 deletions
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35
arch/s390/include/asm/pgtable.h
View File

@ -506,12 +506,15 @@ static inline int pud_bad(pud_t pud)
static inline int pmd_present(pmd_t pmd)
{
return (pmd_val(pmd) & _SEGMENT_ENTRY_ORIGIN) != 0UL;
unsigned long mask = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO;
return (pmd_val(pmd) & mask) == _HPAGE_TYPE_NONE ||
!(pmd_val(pmd) & _SEGMENT_ENTRY_INV);
}
static inline int pmd_none(pmd_t pmd)
{
return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) != 0UL;
return (pmd_val(pmd) & _SEGMENT_ENTRY_INV) &&
!(pmd_val(pmd) & _SEGMENT_ENTRY_RO);
}
static inline int pmd_large(pmd_t pmd)
@ -1223,6 +1226,11 @@ static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define SEGMENT_NONE __pgprot(_HPAGE_TYPE_NONE)
#define SEGMENT_RO __pgprot(_HPAGE_TYPE_RO)
#define SEGMENT_RW __pgprot(_HPAGE_TYPE_RW)
#define __HAVE_ARCH_PGTABLE_DEPOSIT
extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pgtable_t pgtable);
@ -1242,16 +1250,15 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
{
unsigned long pgprot_pmd = 0;
if (pgprot_val(pgprot) & _PAGE_INVALID) {
if (pgprot_val(pgprot) & _PAGE_SWT)
pgprot_pmd |= _HPAGE_TYPE_NONE;
pgprot_pmd |= _SEGMENT_ENTRY_INV;
}
if (pgprot_val(pgprot) & _PAGE_RO)
pgprot_pmd |= _SEGMENT_ENTRY_RO;
return pgprot_pmd;
/*
* pgprot is PAGE_NONE, PAGE_RO, or PAGE_RW (see __Pxxx / __Sxxx)
* Convert to segment table entry format.
*/
if (pgprot_val(pgprot) == pgprot_val(PAGE_NONE))
return pgprot_val(SEGMENT_NONE);
if (pgprot_val(pgprot) == pgprot_val(PAGE_RO))
return pgprot_val(SEGMENT_RO);
return pgprot_val(SEGMENT_RW);
}
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
@ -1269,7 +1276,9 @@ static inline pmd_t pmd_mkhuge(pmd_t pmd)
static inline pmd_t pmd_mkwrite(pmd_t pmd)
{
pmd_val(pmd) &= ~_SEGMENT_ENTRY_RO;
/* Do not clobber _HPAGE_TYPE_NONE pages! */
if (!(pmd_val(pmd) & _SEGMENT_ENTRY_INV))
pmd_val(pmd) &= ~_SEGMENT_ENTRY_RO;
return pmd;
}