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Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
-rw-r--r--arch/powerpc/mm/hugetlbpage.c40
1 files changed, 35 insertions, 5 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 06c14523b..9833fee49 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -89,6 +89,25 @@ int pgd_huge(pgd_t pgd)
*/
return ((pgd_val(pgd) & 0x3) != 0x0);
}
+
+#if defined(CONFIG_PPC_64K_PAGES) && defined(CONFIG_DEBUG_VM)
+/*
+ * This enables us to catch the wrong page directory format
+ * Moved here so that we can use WARN() in the call.
+ */
+int hugepd_ok(hugepd_t hpd)
+{
+ bool is_hugepd;
+
+ /*
+ * We should not find this format in page directory, warn otherwise.
+ */
+ is_hugepd = (((hpd.pd & 0x3) == 0x0) && ((hpd.pd & HUGEPD_SHIFT_MASK) != 0));
+ WARN(is_hugepd, "Found wrong page directory format\n");
+ return 0;
+}
+#endif
+
#else
int pmd_huge(pmd_t pmd)
{
@@ -109,7 +128,7 @@ int pgd_huge(pgd_t pgd)
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
/* Only called for hugetlbfs pages, hence can ignore THP */
- return __find_linux_pte_or_hugepte(mm->pgd, addr, NULL);
+ return __find_linux_pte_or_hugepte(mm->pgd, addr, NULL, NULL);
}
static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
@@ -684,13 +703,14 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb,
struct page *
follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
{
+ bool is_thp;
pte_t *ptep, pte;
unsigned shift;
unsigned long mask, flags;
struct page *page = ERR_PTR(-EINVAL);
local_irq_save(flags);
- ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift);
+ ptep = find_linux_pte_or_hugepte(mm->pgd, address, &is_thp, &shift);
if (!ptep)
goto no_page;
pte = READ_ONCE(*ptep);
@@ -699,7 +719,7 @@ follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
* Transparent hugepages are handled by generic code. We can skip them
* here.
*/
- if (!shift || pmd_trans_huge(__pmd(pte_val(pte))))
+ if (!shift || is_thp)
goto no_page;
if (!pte_present(pte)) {
@@ -956,7 +976,7 @@ void flush_dcache_icache_hugepage(struct page *page)
*/
pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
- unsigned *shift)
+ bool *is_thp, unsigned *shift)
{
pgd_t pgd, *pgdp;
pud_t pud, *pudp;
@@ -968,6 +988,9 @@ pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
if (shift)
*shift = 0;
+ if (is_thp)
+ *is_thp = false;
+
pgdp = pgdir + pgd_index(ea);
pgd = READ_ONCE(*pgdp);
/*
@@ -1015,7 +1038,14 @@ pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
if (pmd_none(pmd))
return NULL;
- if (pmd_huge(pmd) || pmd_large(pmd)) {
+ if (pmd_trans_huge(pmd)) {
+ if (is_thp)
+ *is_thp = true;
+ ret_pte = (pte_t *) pmdp;
+ goto out;
+ }
+
+ if (pmd_huge(pmd)) {
ret_pte = (pte_t *) pmdp;
goto out;
} else if (is_hugepd(__hugepd(pmd_val(pmd))))