linux-kernel - [PATCH 05/15] csky: switch to generic version of pte allocation

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Message-Id: <1556810922-20248-6-git-send-email-rppt@linux.ibm.com>
Date:   Thu,  2 May 2019 18:28:32 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greentime Hu <green.hu@...il.com>,
        Guan Xuetao <gxt@....edu.cn>, Guo Ren <guoren@...nel.org>,
        Helge Deller <deller@....de>, Ley Foon Tan <lftan@...era.com>,
        Matthew Wilcox <willy@...radead.org>,
        Matt Turner <mattst88@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Burton <paul.burton@...s.com>,
        Richard Kuo <rkuo@...eaurora.org>,
        Richard Weinberger <richard@....at>,
        Russell King <linux@...linux.org.uk>,
        Sam Creasey <sammy@...my.net>, x86@...nel.org,
        linux-alpha@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-riscv@...ts.infradead.org, linux-um@...ts.infradead.org,
        nios2-dev@...ts.rocketboards.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: [PATCH 05/15] csky: switch to generic version of pte allocation

The csky implementation pte_alloc_one(), pte_free_kernel() and pte_free()
is identical to the generic except of lack of __GFP_ACCOUNT for the user
PTEs allocation.

Switch csky to use generic version of these functions.

The csky implementation of pte_alloc_one_kernel() is not replaced because
it does not clear the allocated page but rather sets each PTE in it to a
non-zero value.

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

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/csky/include/asm/pgalloc.h | 30 +++---------------------------
 1 file changed, 3 insertions(+), 27 deletions(-)

diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h
index d213bb4..98c571670 100644
--- a/arch/csky/include/asm/pgalloc.h
+++ b/arch/csky/include/asm/pgalloc.h
@@ -8,6 +8,9 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 
+#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
+#include <asm-generic/pgalloc.h>	/* for pte_{alloc,free}_one */
+
 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 					pte_t *pte)
 {
@@ -39,33 +42,6 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
 	return pte;
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm)
-{
-	struct page *pte;
-
-	pte = alloc_pages(GFP_KERNEL | __GFP_ZERO, 0);
-	if (!pte)
-		return NULL;
-
-	if (!pgtable_page_ctor(pte)) {
-		__free_page(pte);
-		return NULL;
-	}
-
-	return pte;
-}
-
-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
-{
-	free_pages((unsigned long)pte, PTE_ORDER);
-}
-
-static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
-{
-	pgtable_page_dtor(pte);
-	__free_pages(pte, PTE_ORDER);
-}
-
 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 {
 	free_pages((unsigned long)pgd, PGD_ORDER);
-- 
2.7.4