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From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        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-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
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        nios2-dev@lists.rocketboards.org,
        Mike Rapoport <rppt@linux.ibm.com>
Subject: [PATCH 08/15] mips: switch to generic version of pte allocation
Date:   Thu,  2 May 2019 18:28:35 +0300
In-Reply-To: <1556810922-20248-1-git-send-email-rppt@linux.ibm.com>
References: <1556810922-20248-1-git-send-email-rppt@linux.ibm.com>
Message-Id: <1556810922-20248-9-git-send-email-rppt@linux.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

MIPS allocates kernel PTE pages with

	__get_free_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER)

and user PTE pages with

	alloc_pages(GFP_KERNEL | __GFP_ZERO, PTE_ORDER)

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>
---
 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