60e50f34b1
m68k has two or three levels of page tables and can use appropriate pgtable-nopXd and folding of the upper layers. Replace usage of include/asm-generic/4level-fixup.h and explicit definitions of __PAGETABLE_PxD_FOLDED in m68k with include/asm-generic/pgtable-nopmd.h for two-level configurations and with include/asm-generic/pgtable-nopud.h for three-lelve configurations and adjust page table manipulation macros and functions accordingly. [akpm@linux-foundation.org: fix merge glitch] [geert@linux-m68k.org: more merge glitch fixes] [akpm@linux-foundation.org: s/bad_pgd/bad_pud/, per Mike] Link: http://lkml.kernel.org/r/1572938135-31886-6-git-send-email-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Greg Ungerer <gerg@linux-m68k.org> Cc: Anatoly Pugachev <matorola@gmail.com> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Peter Rosin <peda@axentia.se> Cc: Richard Weinberger <richard@nod.at> Cc: Rolf Eike Beer <eike-kernel@sf-tec.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Russell King <rmk+kernel@armlinux.org.uk> Cc: Sam Creasey <sammy@sammy.net> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
99 lines
2.0 KiB
C
99 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef M68K_MCF_PGALLOC_H
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#define M68K_MCF_PGALLOC_H
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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extern 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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extern const char bad_pmd_string[];
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extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
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{
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unsigned long page = __get_free_page(GFP_DMA);
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if (!page)
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return NULL;
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memset((void *)page, 0, PAGE_SIZE);
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return (pte_t *) (page);
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}
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extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
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{
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return (pmd_t *) pgd;
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}
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#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
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(unsigned long)(page_address(page)))
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#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
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#define pmd_pgtable(pmd) pmd_page(pmd)
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static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
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unsigned long address)
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{
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pgtable_pte_page_dtor(page);
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__free_page(page);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm)
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{
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struct page *page = alloc_pages(GFP_DMA, 0);
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pte_t *pte;
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if (!page)
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return NULL;
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if (!pgtable_pte_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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pte = kmap(page);
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if (pte) {
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clear_page(pte);
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__flush_page_to_ram(pte);
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flush_tlb_kernel_page(pte);
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nocache_page(pte);
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}
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kunmap(page);
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return page;
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}
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static inline void pte_free(struct mm_struct *mm, struct page *page)
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{
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pgtable_pte_page_dtor(page);
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__free_page(page);
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}
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/*
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* In our implementation, each pgd entry contains 1 pmd that is never allocated
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* or freed. pgd_present is always 1, so this should never be called. -NL
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*/
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#define pmd_free(mm, pmd) BUG()
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static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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free_page((unsigned long) pgd);
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}
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static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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{
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pgd_t *new_pgd;
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new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
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if (!new_pgd)
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return NULL;
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memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
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memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
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return new_pgd;
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}
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#endif /* M68K_MCF_PGALLOC_H */
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