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From: Mike Rapoport <rppt@linux.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Greentime Hu <green.hu@gmail.com>, Guan Xuetao <gxt@pku.edu.cn>,
	Guo Ren <guoren@kernel.org>, Helge Deller <deller@gmx.de>,
	Ley Foon Tan <lftan@altera.com>,
	Matthew Wilcox <willy@infradead.org>,
	Matt Turner <mattst88@gmail.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Michal Hocko <mhocko@suse.com>,
	Palmer Dabbelt <palmer@sifive.com>,
	Paul Burton <paul.burton@mips.com>,
	Richard Kuo <rkuo@codeaurora.org>,
	Richard Weinberger <richard@nod.at>,
	Russell King <linux@armlinux.org.uk>,
	Sam Creasey <sammy@sammy.net>,
	x86@kernel.org, linux-alpha@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-mm@kvack.org, linux-parisc@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
	linux-um@lists.infradead.org, nios2-dev@lists.rocketboards.org,
	Mike Rapoport <rppt@linux.ibm.com>
Subject: [PATCH v2 08/14] mips: switch to generic version of pte allocation
Date: Wed,  8 May 2019 09:17:05 +0300
Message-ID: <1557296232-15361-9-git-send-email-rppt@linux.ibm.com> (raw)
In-Reply-To: <1557296232-15361-1-git-send-email-rppt@linux.ibm.com>

MIPS allocates kernel PTE pages with

	__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER)

and user PTE pages with

	pte = alloc_pages(GFP_KERNEL, PTE_ORDER)

and then uses clear_highpage(pte) to zero out the allocated page for the
user page tables.

The PTE_ORDER is hardwired to zero, which makes MIPS implementation almost
identical to the generic one.

Switch MIPS 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_kernel() and pte_free() versions on mips are identical to the
generic ones and can be simply dropped.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Paul Burton <paul.burton@mips.com>
---
 arch/mips/include/asm/pgalloc.h | 33 ++-------------------------------
 1 file changed, 2 insertions(+), 31 deletions(-)

diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h
index 27808d9..aa16b85 100644
--- a/arch/mips/include/asm/pgalloc.h
+++ b/arch/mips/include/asm/pgalloc.h
@@ -13,6 +13,8 @@
 #include <linux/mm.h>
 #include <linux/sched.h>
 
+#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)
 {
@@ -50,37 +52,6 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 	free_pages((unsigned long)pgd, PGD_ORDER);
 }
 
-static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
-{
-	return (pte_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER);
-}
-
-static inline struct page *pte_alloc_one(struct mm_struct *mm)
-{
-	struct page *pte;
-
-	pte = alloc_pages(GFP_KERNEL, PTE_ORDER);
-	if (!pte)
-		return NULL;
-	clear_highpage(pte);
-	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);
-}
-
 #define __pte_free_tlb(tlb,pte,address)			\
 do {							\
 	pgtable_page_dtor(pte);				\
-- 
2.7.4


  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-08  6:16 [PATCH v2 00/14] introduce generic pte_{alloc,free}_one[_kernel] Mike Rapoport
2019-05-08  6:16 ` [PATCH v2 01/14] asm-generic, x86: " Mike Rapoport
2019-05-08  6:16 ` [PATCH v2 02/14] alpha: switch to generic version of pte allocation Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 03/14] arm: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 04/14] arm64: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 05/14] csky: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 06/14] hexagon: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 07/14] m68k: sun3: " Mike Rapoport
2019-05-08  6:17 ` Mike Rapoport [this message]
2019-05-08  6:17 ` [PATCH v2 09/14] nds32: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 10/14] nios2: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 11/14] parisc: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 12/14] riscv: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 13/14] um: " Mike Rapoport
2019-05-08  6:17 ` [PATCH v2 14/14] unicore32: " Mike Rapoport

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