unicore32: switch to generic version of pte allocation

Replace __get_free_page() and alloc_pages() calls with the generic
__pte_alloc_one_kernel() and __pte_alloc_one().

There is no functional change for the kernel PTE allocation.

The difference for the user PTEs, is that the clear_pte_table() is now
called after pgtable_page_ctor() and the addition of __GFP_ACCOUNT to the
GFP flags.

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

Link: http://lkml.kernel.org/r/1557296232-15361-15-git-send-email-rppt@linux.ibm.comSigned-off-by: Mike Rapoport <rppt@linux.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sam Creasey <sammy@sammy.net>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Guo Ren <ren_guo@c-sky.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/unicore32/include/asm/pgalloc.h

@@ -14,6 +14,10 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
+#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
+#define __HAVE_ARCH_PTE_ALLOC_ONE
+#include <asm-generic/pgalloc.h>
+
 #define check_pgt_cache()		do { } while (0)
 
 #define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_PRESENT)
@@ -25,17 +29,14 @@ extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);
 #define pgd_alloc(mm)			get_pgd_slow(mm)
 #define pgd_free(mm, pgd)		free_pgd_slow(mm, pgd)
 
-#define PGALLOC_GFP	(GFP_KERNEL | __GFP_ZERO)
-
 /*
  * Allocate one PTE table.
  */
 static inline pte_t *
 pte_alloc_one_kernel(struct mm_struct *mm)
 {
-	pte_t *pte;
+	pte_t *pte = __pte_alloc_one_kernel(mm);
 
-	pte = (pte_t *)__get_free_page(PGALLOC_GFP);
 	if (pte)
 		clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));
 
@@ -47,35 +48,14 @@ pte_alloc_one(struct mm_struct *mm)
 {
 	struct page *pte;
 
-	pte = alloc_pages(PGALLOC_GFP, 0);
+	pte = __pte_alloc_one(mm, GFP_PGTABLE_USER);
 	if (!pte)
 		return NULL;
-	if (!PageHighMem(pte)) {
-		void *page = page_address(pte);
-		clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
-	}
-	if (!pgtable_page_ctor(pte)) {
-		__free_page(pte);
-	}
-
+	if (!PageHighMem(pte))
+		clean_pte_table(page_address(pte));
 	return pte;
 }
 
-/*
- * Free one PTE table.
- */
-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
-{
-	if (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);
-}
-
 static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
 {
 	set_pmd(pmdp, __pmd(pmdval));