[PATCH 14/15] um: switch to generic version of pte allocation

Mike Rapoport
2019-05-02T15:28:41Z

um allocates PTE pages with __get_free_page() and uses
GFP_KERNEL | __GFP_ZERO for the allocations.

Switch it to the generic version that does exactly the same thing for the
kernel page tables and adds __GFP_ACCOUNT for the user PTEs.

The pte_free() and pte_free_kernel() versions are identical to the generic
ones and can be simply dropped.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
---
arch/um/include/asm/pgalloc.h | 16 ++--------------
arch/um/kernel/mem.c | 22 ----------------------
2 files changed, 2 insertions(+), 36 deletions(-)

diff --git a/arch/um/include/asm/pgalloc.h b/arch/um/include/asm/pgalloc.h
index 99eb568..d7b282e 100644
--- a/arch/um/include/asm/pgalloc.h
+++ b/arch/um/include/asm/pgalloc.h
@@ -10,6 +10,8 @@

#include <linux/mm.h>

+#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
+
#define pmd_populate_kernel(mm, pmd, pte) \
set_pmd(pmd, __pmd(_PAGE_TABLE + (unsigned long) __pa(pte)))

@@ -25,20 +27,6 @@
extern pgd_t *pgd_alloc(struct mm_struct *);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);

-extern pte_t *pte_alloc_one_kernel(struct mm_struct *);
-extern pgtable_t pte_alloc_one(struct mm_struct *);
-
-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
-{
- free_page((unsigned long) pte);
-}
-
-static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
-{
- pgtable_page_dtor(pte);
- __free_page(pte);
-}
-
#define __pte_free_tlb(tlb,pte, address) \
do { \
pgtable_page_dtor(pte); \
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 99aa11b..2280374 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -215,28 +215,6 @@ void pgd_free(struct mm_struct *mm, pgd_t *pgd)
free_page((unsigned long) pgd);
}

-pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
-{
- pte_t *pte;
-
- pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
- return pte;
-}
-
-pgtable_t pte_alloc_one(struct mm_struct *mm)
-{
- struct page *pte;
-
- pte = alloc_page(GFP_KERNEL|__GFP_ZERO);
- if (!pte)
- return NULL;
- if (!pgtable_page_ctor(pte)) {
- __free_page(pte);
- return NULL;
- }
- return pte;
-}
-
#ifdef CONFIG_3_LEVEL_PGTABLES
pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
--
2.7.4