mm, hugetlbfs: introduce ->pagesize() to vm_operations_struct
When device-dax is operating in huge-page mode we want it to behave like
hugetlbfs and report the MMU page mapping size that is being enforced by
the vma.
Similar to commit 31383c6865
"mm, hugetlbfs: introduce ->split() to
vm_operations_struct" it would be messy to teach vma_mmu_pagesize()
about device-dax page mapping sizes in the same (hstate) way that
hugetlbfs communicates this attribute. Instead, these patches introduce
a new ->pagesize() vm operation.
Link: http://lkml.kernel.org/r/151996254734.27922.15813097401404359642.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
09135cc594
commit
05ea88608d
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@ -390,6 +390,7 @@ struct vm_operations_struct {
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int (*huge_fault)(struct vm_fault *vmf, enum page_entry_size pe_size);
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void (*map_pages)(struct vm_fault *vmf,
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pgoff_t start_pgoff, pgoff_t end_pgoff);
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unsigned long (*pagesize)(struct vm_area_struct * area);
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/* notification that a previously read-only page is about to become
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* writable, if an error is returned it will cause a SIGBUS */
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17
mm/hugetlb.c
17
mm/hugetlb.c
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@ -637,14 +637,9 @@ EXPORT_SYMBOL_GPL(linear_hugepage_index);
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*/
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unsigned long vma_kernel_pagesize(struct vm_area_struct *vma)
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{
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struct hstate *hstate;
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if (!is_vm_hugetlb_page(vma))
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if (vma->vm_ops && vma->vm_ops->pagesize)
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return vma->vm_ops->pagesize(vma);
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return PAGE_SIZE;
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hstate = hstate_vma(vma);
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return 1UL << huge_page_shift(hstate);
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}
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EXPORT_SYMBOL_GPL(vma_kernel_pagesize);
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@ -3151,6 +3146,13 @@ static int hugetlb_vm_op_split(struct vm_area_struct *vma, unsigned long addr)
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return 0;
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}
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static unsigned long hugetlb_vm_op_pagesize(struct vm_area_struct *vma)
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{
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struct hstate *hstate = hstate_vma(vma);
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return 1UL << huge_page_shift(hstate);
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}
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/*
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* We cannot handle pagefaults against hugetlb pages at all. They cause
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* handle_mm_fault() to try to instantiate regular-sized pages in the
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@ -3168,6 +3170,7 @@ const struct vm_operations_struct hugetlb_vm_ops = {
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.open = hugetlb_vm_op_open,
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.close = hugetlb_vm_op_close,
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.split = hugetlb_vm_op_split,
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.pagesize = hugetlb_vm_op_pagesize,
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};
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static pte_t make_huge_pte(struct vm_area_struct *vma, struct page *page,
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