f820e2805c
At the moment xtensa uses slab allocator for PTE table. It doesn't work with enabled split page table lock: slab uses page->slab_cache and page->first_page for its pages. These fields share stroage with page->ptl. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Chris Zankel <chris@zankel.net> Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
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* include/asm-xtensa/pgalloc.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Copyright (C) 2001-2007 Tensilica Inc.
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*/
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#ifndef _XTENSA_PGALLOC_H
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#define _XTENSA_PGALLOC_H
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#ifdef __KERNEL__
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#include <linux/highmem.h>
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#include <linux/slab.h>
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/*
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* Allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pgd, so has no extra memory associated with it.
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*/
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#define pmd_populate_kernel(mm, pmdp, ptep) \
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(pmd_val(*(pmdp)) = ((unsigned long)ptep))
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#define pmd_populate(mm, pmdp, page) \
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(pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
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#define pmd_pgtable(pmd) pmd_page(pmd)
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static inline pgd_t*
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pgd_alloc(struct mm_struct *mm)
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{
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return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
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}
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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 pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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pte_t *ptep;
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int i;
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ptep = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
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if (!ptep)
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return NULL;
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for (i = 0; i < 1024; i++)
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pte_clear(NULL, 0, ptep + i);
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return ptep;
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}
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static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
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unsigned long addr)
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{
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pte_t *pte;
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struct page *page;
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pte = pte_alloc_one_kernel(mm, addr);
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if (!pte)
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return NULL;
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page = virt_to_page(pte);
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if (!pgtable_page_ctor(page)) {
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__free_page(page);
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return NULL;
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}
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return page;
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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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static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
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{
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pgtable_page_dtor(pte);
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__free_page(pte);
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}
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#define pmd_pgtable(pmd) pmd_page(pmd)
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#endif /* __KERNEL__ */
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#endif /* _XTENSA_PGALLOC_H */
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