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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Hugh Dickins
32cc0b7c9d
Add powerpc-specific pte_free_defer(), to free table page via call_rcu(). pte_free_defer() will be called inside khugepaged's retract_page_tables() loop, where allocating extra memory cannot be relied upon. This precedes the generic version to avoid build breakage from incompatible pgtable_t. This is awkward because the struct page contains only one rcu_head, but that page may be shared between PTE_FRAG_NR pagetables, each wanting to use the rcu_head at the same time. But powerpc never reuses a fragment once it has been freed: so mark the page Active in pte_free_defer(), before calling pte_fragment_free() directly; and there call_rcu() to pte_free_now() when last fragment is freed and the page is PageActive. Link: https://lkml.kernel.org/r/[email protected] Suggested-by: Jason Gunthorpe <[email protected]> Signed-off-by: Hugh Dickins <[email protected]> Cc: Alexander Gordeev <[email protected]> Cc: Alistair Popple <[email protected]> Cc: Aneesh Kumar K.V <[email protected]> Cc: Anshuman Khandual <[email protected]> Cc: Axel Rasmussen <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: Christophe Leroy <[email protected]> Cc: Christoph Hellwig <[email protected]> Cc: Claudio Imbrenda <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: "David S. Miller" <[email protected]> Cc: Gerald Schaefer <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Huang, Ying <[email protected]> Cc: Ira Weiny <[email protected]> Cc: Jann Horn <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Lorenzo Stoakes <[email protected]> Cc: Matthew Wilcox (Oracle) <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Miaohe Lin <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Mike Kravetz <[email protected]> Cc: Mike Rapoport (IBM) <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: Pavel Tatashin <[email protected]> Cc: Peter Xu <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Qi Zheng <[email protected]> Cc: Ralph Campbell <[email protected]> Cc: Russell King <[email protected]> Cc: SeongJae Park <[email protected]> Cc: Song Liu <[email protected]> Cc: Steven Price <[email protected]> Cc: Suren Baghdasaryan <[email protected]> Cc: Thomas Hellström <[email protected]> Cc: Vasily Gorbik <[email protected]> Cc: Vishal Moola (Oracle) <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Will Deacon <[email protected]> Cc: Yang Shi <[email protected]> Cc: Yu Zhao <[email protected]> Cc: Zack Rusin <[email protected]> Cc: Zi Yan <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_PGALLOC_H
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#define _ASM_POWERPC_PGALLOC_H
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#include <linux/mm.h>
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#ifndef MODULE
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static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp)
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{
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if (unlikely(mm == &init_mm))
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return gfp;
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return gfp | __GFP_ACCOUNT;
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}
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#else /* !MODULE */
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static inline gfp_t pgtable_gfp_flags(struct mm_struct *mm, gfp_t gfp)
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{
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return gfp | __GFP_ACCOUNT;
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}
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#endif /* MODULE */
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#define PGALLOC_GFP (GFP_KERNEL | __GFP_ZERO)
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pte_t *pte_fragment_alloc(struct mm_struct *mm, int kernel);
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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 *)pte_fragment_alloc(mm, 1);
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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 (pgtable_t)pte_fragment_alloc(mm, 0);
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}
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void pte_frag_destroy(void *pte_frag);
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void pte_fragment_free(unsigned long *table, int kernel);
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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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pte_fragment_free((unsigned long *)pte, 1);
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}
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static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
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{
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pte_fragment_free((unsigned long *)ptepage, 0);
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}
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/* arch use pte_free_defer() implementation in arch/powerpc/mm/pgtable-frag.c */
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#define pte_free_defer pte_free_defer
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void pte_free_defer(struct mm_struct *mm, pgtable_t pgtable);
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/*
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* Functions that deal with pagetables that could be at any level of
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* the table need to be passed an "index_size" so they know how to
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* handle allocation. For PTE pages, the allocation size will be
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* (2^index_size * sizeof(pointer)) and allocations are drawn from
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* the kmem_cache in PGT_CACHE(index_size).
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*
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* The maximum index size needs to be big enough to allow any
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* pagetable sizes we need, but small enough to fit in the low bits of
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* any page table pointer. In other words all pagetables, even tiny
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* ones, must be aligned to allow at least enough low 0 bits to
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* contain this value. This value is also used as a mask, so it must
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* be one less than a power of two.
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*/
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#define MAX_PGTABLE_INDEX_SIZE 0xf
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extern struct kmem_cache *pgtable_cache[];
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#define PGT_CACHE(shift) pgtable_cache[shift]
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#ifdef CONFIG_PPC_BOOK3S
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#include <asm/book3s/pgalloc.h>
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#else
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#include <asm/nohash/pgalloc.h>
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#endif
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#endif /* _ASM_POWERPC_PGALLOC_H */
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