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powerpc/mm/hugetlb/book3s: add _PAGE_PRESENT to hugepd pointer.

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This make hugetlb directory pointer similar to other page able entries. A hugepd
entry is identified by lack of _PAGE_PTE bit set and directory size stored in
HUGEPD_SHIFT_MASK. We update that to also look at _PAGE_PRESENT

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2018-09-20 23:39:43 +05:30 committed by Michael Ellerman
parent da7ad366b4
commit f1981b5b30
3 changed files with 5 additions and 2 deletions
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2
arch/powerpc/include/asm/book3s/64/hash-4k.h
View file

@ -66,7 +66,7 @@ static inline int hash__hugepd_ok(hugepd_t hpd)
* if it is not a pte and have hugepd shift mask
* set, then it is a hugepd directory pointer
*/
if (!(hpdval & _PAGE_PTE) &&
if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) &&
((hpdval & HUGEPD_SHIFT_MASK) != 0))
return true;
return false;

3
arch/powerpc/include/asm/book3s/64/hugetlb.h
View file

@ -39,4 +39,7 @@ static inline bool gigantic_page_supported(void)
}
#endif
/* hugepd entry valid bit */
#define HUGEPD_VAL_BITS (0x8000000000000000UL)
#endif

2
arch/powerpc/mm/hugetlbpage.c
View file

@ -95,7 +95,7 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
break;
else {
#ifdef CONFIG_PPC_BOOK3S_64
*hpdp = __hugepd(__pa(new) |
*hpdp = __hugepd(__pa(new) | HUGEPD_VAL_BITS |
(shift_to_mmu_psize(pshift) << 2));
#elif defined(CONFIG_PPC_8xx)
*hpdp = __hugepd(__pa(new) | _PMD_USER |