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pagewalk: separate function pointers from iterator data

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The mm_walk structure currently mixed data and code.  Split out the
operations vectors into a new mm_walk_ops structure, and while we are
changing the API also declare the mm_walk structure inside the
walk_page_range and walk_page_vma functions.

Based on patch from Linus Torvalds.

Link: https://lore.kernel.org/r/20190828141955.22210-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig
2019-08-28 16:19:54 +02:00
committed by Jason Gunthorpe
parent a520110e4a
commit 7b86ac3371
13 changed files with 251 additions and 244 deletions
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23
mm/migrate.c
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@@ -2320,6 +2320,11 @@ next:
return 0;
}
static const struct mm_walk_ops migrate_vma_walk_ops = {
.pmd_entry = migrate_vma_collect_pmd,
.pte_hole = migrate_vma_collect_hole,
};
/*
* migrate_vma_collect() - collect pages over a range of virtual addresses
* @migrate: migrate struct containing all migration information
@@ -2331,21 +2336,15 @@ next:
static void migrate_vma_collect(struct migrate_vma *migrate)
{
struct mmu_notifier_range range;
struct mm_walk mm_walk = {
.pmd_entry = migrate_vma_collect_pmd,
.pte_hole = migrate_vma_collect_hole,
.vma = migrate->vma,
.mm = migrate->vma->vm_mm,
.private = migrate,
};
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL, mm_walk.mm,
migrate->start,
migrate->end);
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, NULL,
migrate->vma->vm_mm, migrate->start, migrate->end);
mmu_notifier_invalidate_range_start(&range);
walk_page_range(migrate->start, migrate->end, &mm_walk);
mmu_notifier_invalidate_range_end(&range);
walk_page_range(migrate->vma->vm_mm, migrate->start, migrate->end,
&migrate_vma_walk_ops, migrate);
mmu_notifier_invalidate_range_end(&range);
migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT);
}