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Diffstat (limited to 'arch/arm64/mm/hugetlbpage.c')
-rw-r--r--arch/arm64/mm/hugetlbpage.c94
1 files changed, 43 insertions, 51 deletions
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 6cb0fa92a651..ecc6818191df 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -54,14 +54,14 @@ static inline pgprot_t pte_pgprot(pte_t pte)
static int find_num_contig(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, size_t *pgsize)
{
- pgd_t *pgd = pgd_offset(mm, addr);
- pud_t *pud;
- pmd_t *pmd;
+ pgd_t *pgdp = pgd_offset(mm, addr);
+ pud_t *pudp;
+ pmd_t *pmdp;
*pgsize = PAGE_SIZE;
- pud = pud_offset(pgd, addr);
- pmd = pmd_offset(pud, addr);
- if ((pte_t *)pmd == ptep) {
+ pudp = pud_offset(pgdp, addr);
+ pmdp = pmd_offset(pudp, addr);
+ if ((pte_t *)pmdp == ptep) {
*pgsize = PMD_SIZE;
return CONT_PMDS;
}
@@ -181,11 +181,8 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
clear_flush(mm, addr, ptep, pgsize, ncontig);
- for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn) {
- pr_debug("%s: set pte %p to 0x%llx\n", __func__, ptep,
- pte_val(pfn_pte(pfn, hugeprot)));
+ for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
- }
}
void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
@@ -203,20 +200,20 @@ void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *huge_pte_alloc(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
{
- pgd_t *pgd;
- pud_t *pud;
- pte_t *pte = NULL;
-
- pr_debug("%s: addr:0x%lx sz:0x%lx\n", __func__, addr, sz);
- pgd = pgd_offset(mm, addr);
- pud = pud_alloc(mm, pgd, addr);
- if (!pud)
+ pgd_t *pgdp;
+ pud_t *pudp;
+ pmd_t *pmdp;
+ pte_t *ptep = NULL;
+
+ pgdp = pgd_offset(mm, addr);
+ pudp = pud_alloc(mm, pgdp, addr);
+ if (!pudp)
return NULL;
if (sz == PUD_SIZE) {
- pte = (pte_t *)pud;
+ ptep = (pte_t *)pudp;
} else if (sz == (PAGE_SIZE * CONT_PTES)) {
- pmd_t *pmd = pmd_alloc(mm, pud, addr);
+ pmdp = pmd_alloc(mm, pudp, addr);
WARN_ON(addr & (sz - 1));
/*
@@ -226,60 +223,55 @@ pte_t *huge_pte_alloc(struct mm_struct *mm,
* will be no pte_unmap() to correspond with this
* pte_alloc_map().
*/
- pte = pte_alloc_map(mm, pmd, addr);
+ ptep = pte_alloc_map(mm, pmdp, addr);
} else if (sz == PMD_SIZE) {
if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
- pud_none(*pud))
- pte = huge_pmd_share(mm, addr, pud);
+ pud_none(READ_ONCE(*pudp)))
+ ptep = huge_pmd_share(mm, addr, pudp);
else
- pte = (pte_t *)pmd_alloc(mm, pud, addr);
+ ptep = (pte_t *)pmd_alloc(mm, pudp, addr);
} else if (sz == (PMD_SIZE * CONT_PMDS)) {
- pmd_t *pmd;
-
- pmd = pmd_alloc(mm, pud, addr);
+ pmdp = pmd_alloc(mm, pudp, addr);
WARN_ON(addr & (sz - 1));
- return (pte_t *)pmd;
+ return (pte_t *)pmdp;
}
- pr_debug("%s: addr:0x%lx sz:0x%lx ret pte=%p/0x%llx\n", __func__, addr,
- sz, pte, pte_val(*pte));
- return pte;
+ return ptep;
}
pte_t *huge_pte_offset(struct mm_struct *mm,
unsigned long addr, unsigned long sz)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
+ pgd_t *pgdp;
+ pud_t *pudp, pud;
+ pmd_t *pmdp, pmd;
- pgd = pgd_offset(mm, addr);
- pr_debug("%s: addr:0x%lx pgd:%p\n", __func__, addr, pgd);
- if (!pgd_present(*pgd))
+ pgdp = pgd_offset(mm, addr);
+ if (!pgd_present(READ_ONCE(*pgdp)))
return NULL;
- pud = pud_offset(pgd, addr);
- if (sz != PUD_SIZE && pud_none(*pud))
+ pudp = pud_offset(pgdp, addr);
+ pud = READ_ONCE(*pudp);
+ if (sz != PUD_SIZE && pud_none(pud))
return NULL;
/* hugepage or swap? */
- if (pud_huge(*pud) || !pud_present(*pud))
- return (pte_t *)pud;
+ if (pud_huge(pud) || !pud_present(pud))
+ return (pte_t *)pudp;
/* table; check the next level */
if (sz == CONT_PMD_SIZE)
addr &= CONT_PMD_MASK;
- pmd = pmd_offset(pud, addr);
+ pmdp = pmd_offset(pudp, addr);
+ pmd = READ_ONCE(*pmdp);
if (!(sz == PMD_SIZE || sz == CONT_PMD_SIZE) &&
- pmd_none(*pmd))
+ pmd_none(pmd))
return NULL;
- if (pmd_huge(*pmd) || !pmd_present(*pmd))
- return (pte_t *)pmd;
+ if (pmd_huge(pmd) || !pmd_present(pmd))
+ return (pte_t *)pmdp;
- if (sz == CONT_PTE_SIZE) {
- pte_t *pte = pte_offset_kernel(pmd, (addr & CONT_PTE_MASK));
- return pte;
- }
+ if (sz == CONT_PTE_SIZE)
+ return pte_offset_kernel(pmdp, (addr & CONT_PTE_MASK));
return NULL;
}
@@ -367,7 +359,7 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
size_t pgsize;
pte_t pte;
- if (!pte_cont(*ptep)) {
+ if (!pte_cont(READ_ONCE(*ptep))) {
ptep_set_wrprotect(mm, addr, ptep);
return;
}
@@ -391,7 +383,7 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma,
size_t pgsize;
int ncontig;
- if (!pte_cont(*ptep)) {
+ if (!pte_cont(READ_ONCE(*ptep))) {
ptep_clear_flush(vma, addr, ptep);
return;
}