[PATCH v4 26/34] mips: Convert various functions to use ptdescs

[Vishal Moola (Oracle)]

As part of the conversions to replace pgtable constructor/destructors with
ptdesc equivalents, convert various page table functions to use ptdescs.

Some of the functions use the *get*page*() helper functions. Convert
these to use pagetable_alloc() and ptdesc_address() instead to help
standardize page tables further.

Signed-off-by: Vishal Moola (Oracle) <vishal.mo...@gmail.com>
---
 arch/mips/include/asm/pgalloc.h | 31 +++++++++++++++++--------------
 arch/mips/mm/pgtable.c          |  7 ++++---
 2 files changed, 21 insertions(+), 17 deletions(-)

diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
index f72e737dda21..6940e5536664 100644
--- a/arch/mips/include/asm/pgalloc.h
+++ b/arch/mips/include/asm/pgalloc.h
@@ -51,13 +51,13 @@ extern pgd_t *pgd_alloc(struct mm_struct *mm);
 
 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 {
-       free_pages((unsigned long)pgd, PGD_TABLE_ORDER);
+       pagetable_free(virt_to_ptdesc(pgd));
 }
 
-#define __pte_free_tlb(tlb,pte,address)                        \
-do {                                                   \
-       pgtable_pte_page_dtor(pte);                     \
-       tlb_remove_page((tlb), pte);                    \
+#define __pte_free_tlb(tlb, pte, address)                      \
+do {                                                           \
+       pagetable_pte_dtor(page_ptdesc(pte));                   \
+       tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));        \
 } while (0)
 
 #ifndef __PAGETABLE_PMD_FOLDED
@@ -65,18 +65,18 @@ do {                                                        
\
 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
 {
        pmd_t *pmd;
-       struct page *pg;
+       struct ptdesc *ptdesc;
 
-       pg = alloc_pages(GFP_KERNEL_ACCOUNT, PMD_TABLE_ORDER);
-       if (!pg)
+       ptdesc = pagetable_alloc(GFP_KERNEL_ACCOUNT, PMD_TABLE_ORDER);
+       if (!ptdesc)
                return NULL;
 
-       if (!pgtable_pmd_page_ctor(pg)) {
-               __free_pages(pg, PMD_TABLE_ORDER);
+       if (!pagetable_pmd_ctor(ptdesc)) {
+               pagetable_free(ptdesc);
                return NULL;
        }
 
-       pmd = (pmd_t *)page_address(pg);
+       pmd = ptdesc_address(ptdesc);
        pmd_init(pmd);
        return pmd;
 }
@@ -90,10 +90,13 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, 
unsigned long address)
 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
 {
        pud_t *pud;
+       struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, PUD_TABLE_ORDER);
 
-       pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_TABLE_ORDER);
-       if (pud)
-               pud_init(pud);
+       if (!ptdesc)
+               return NULL;
+       pud = ptdesc_address(ptdesc);
+
+       pud_init(pud);
        return pud;
 }
 
diff --git a/arch/mips/mm/pgtable.c b/arch/mips/mm/pgtable.c
index b13314be5d0e..729258ff4e3b 100644
--- a/arch/mips/mm/pgtable.c
+++ b/arch/mips/mm/pgtable.c
@@ -10,10 +10,11 @@
 
 pgd_t *pgd_alloc(struct mm_struct *mm)
 {
-       pgd_t *ret, *init;
+       pgd_t *init, *ret = NULL;
+       struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, PGD_TABLE_ORDER);
 
-       ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_TABLE_ORDER);
-       if (ret) {
+       if (ptdesc) {
+               ret = ptdesc_address(ptdesc);
                init = pgd_offset(&init_mm, 0UL);
                pgd_init(ret);
                memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
-- 
2.40.1