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![Mike Rapoport](/assets/img/avatar_default.png)
Most architectures have identical or very similar implementation of pte_alloc_one_kernel(), pte_alloc_one(), pte_free_kernel() and pte_free(). Add a generic implementation that can be reused across architectures and enable its use on x86. The generic implementation uses GFP_KERNEL | __GFP_ZERO for the kernel page tables and GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT for the user page tables. The "base" functions for PTE allocation, namely __pte_alloc_one_kernel() and __pte_alloc_one() are intended for the architectures that require additional actions after actual memory allocation or must use non-default GFP flags. x86 is switched to use generic pte_alloc_one_kernel(), pte_free_kernel() and pte_free(). x86 still implements pte_alloc_one() to allow run-time control of GFP flags required for "userpte" command line option. Link: http://lkml.kernel.org/r/1557296232-15361-2-git-send-email-rppt@linux.ibm.com Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Arnd Bergmann <arnd@arndb.de> 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: Guo Ren <ren_guo@c-sky.com> 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: Ralf Baechle <ralf@linux-mips.org> 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: Vincent Chen <deanbo422@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_PGALLOC_H
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#define __ASM_GENERIC_PGALLOC_H
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#ifdef CONFIG_MMU
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#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
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#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
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/**
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* __pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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* @mm: the mm_struct of the current context
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*
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* This function is intended for architectures that need
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* anything beyond simple page allocation.
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm)
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{
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return (pte_t *)__get_free_page(GFP_PGTABLE_KERNEL);
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}
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#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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/**
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* pte_alloc_one_kernel - allocate a page for PTE-level kernel page table
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* @mm: the mm_struct of the current context
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*
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* Return: pointer to the allocated memory or %NULL on error
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*/
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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{
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return __pte_alloc_one_kernel(mm);
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}
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#endif
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/**
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* pte_free_kernel - free PTE-level kernel page table page
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* @mm: the mm_struct of the current context
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* @pte: pointer to the memory containing the page table
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*/
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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free_page((unsigned long)pte);
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}
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/**
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* __pte_alloc_one - allocate a page for PTE-level user page table
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* @mm: the mm_struct of the current context
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* @gfp: GFP flags to use for the allocation
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*
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* Allocates a page and runs the pgtable_page_ctor().
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*
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* This function is intended for architectures that need
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* anything beyond simple page allocation or must have custom GFP flags.
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*
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* Return: `struct page` initialized as page table or %NULL on error
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*/
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static inline pgtable_t __pte_alloc_one(struct mm_struct *mm, gfp_t gfp)
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{
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struct page *pte;
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pte = alloc_page(gfp);
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if (!pte)
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return NULL;
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if (!pgtable_page_ctor(pte)) {
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__free_page(pte);
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return NULL;
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}
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return pte;
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}
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#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
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/**
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* pte_alloc_one - allocate a page for PTE-level user page table
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* @mm: the mm_struct of the current context
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*
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* Allocates a page and runs the pgtable_page_ctor().
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*
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* Return: `struct page` initialized as page table or %NULL on error
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*/
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static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
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{
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return __pte_alloc_one(mm, GFP_PGTABLE_USER);
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}
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#endif
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/*
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* Should really implement gc for free page table pages. This could be
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* done with a reference count in struct page.
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*/
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/**
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* pte_free - free PTE-level user page table page
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* @mm: the mm_struct of the current context
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* @pte_page: the `struct page` representing the page table
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*/
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static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
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{
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pgtable_page_dtor(pte_page);
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__free_page(pte_page);
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}
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#else /* CONFIG_MMU */
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/* This is enough for a nommu architecture */
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#define check_pgt_cache() do { } while (0)
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#endif /* CONFIG_MMU */
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#endif /* __ASM_GENERIC_PGALLOC_H */
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