diff options
author | Christoph Hellwig <hch@lst.de> | 2019-08-06 18:05:45 +0200 |
---|---|---|
committer | Jason Gunthorpe <jgg@mellanox.com> | 2019-08-07 19:58:06 +0200 |
commit | 7f08263d9bc6627382da14f9e81d643d0329d5d1 (patch) | |
tree | 7151f306c17fb5f7e5a8b262c876e7bf0bb9e292 /mm/hmm.c | |
parent | mm/hmm: remove superfluous arguments from hmm_range_register (diff) | |
download | linux-7f08263d9bc6627382da14f9e81d643d0329d5d1.tar.xz linux-7f08263d9bc6627382da14f9e81d643d0329d5d1.zip |
mm/hmm: remove the page_shift member from struct hmm_range
All users pass PAGE_SIZE here, and if we wanted to support single entries
for huge pages we should really just add a HMM_FAULT_HUGEPAGE flag instead
that uses the huge page size instead of having the caller calculate that
size once, just for the hmm code to verify it.
Link: https://lore.kernel.org/r/20190806160554.14046-8-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'mm/hmm.c')
-rw-r--r-- | mm/hmm.c | 42 |
1 files changed, 9 insertions, 33 deletions
@@ -345,13 +345,12 @@ static int hmm_vma_walk_hole_(unsigned long addr, unsigned long end, struct hmm_vma_walk *hmm_vma_walk = walk->private; struct hmm_range *range = hmm_vma_walk->range; uint64_t *pfns = range->pfns; - unsigned long i, page_size; + unsigned long i; hmm_vma_walk->last = addr; - page_size = hmm_range_page_size(range); - i = (addr - range->start) >> range->page_shift; + i = (addr - range->start) >> PAGE_SHIFT; - for (; addr < end; addr += page_size, i++) { + for (; addr < end; addr += PAGE_SIZE, i++) { pfns[i] = range->values[HMM_PFN_NONE]; if (fault || write_fault) { int ret; @@ -779,7 +778,7 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask, struct mm_walk *walk) { #ifdef CONFIG_HUGETLB_PAGE - unsigned long addr = start, i, pfn, mask, size, pfn_inc; + unsigned long addr = start, i, pfn, mask; struct hmm_vma_walk *hmm_vma_walk = walk->private; struct hmm_range *range = hmm_vma_walk->range; struct vm_area_struct *vma = walk->vma; @@ -790,24 +789,12 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask, pte_t entry; int ret = 0; - size = huge_page_size(h); - mask = size - 1; - if (range->page_shift != PAGE_SHIFT) { - /* Make sure we are looking at a full page. */ - if (start & mask) - return -EINVAL; - if (end < (start + size)) - return -EINVAL; - pfn_inc = size >> PAGE_SHIFT; - } else { - pfn_inc = 1; - size = PAGE_SIZE; - } + mask = huge_page_size(h) - 1; ptl = huge_pte_lock(hstate_vma(vma), walk->mm, pte); entry = huge_ptep_get(pte); - i = (start - range->start) >> range->page_shift; + i = (start - range->start) >> PAGE_SHIFT; orig_pfn = range->pfns[i]; range->pfns[i] = range->values[HMM_PFN_NONE]; cpu_flags = pte_to_hmm_pfn_flags(range, entry); @@ -819,8 +806,8 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask, goto unlock; } - pfn = pte_pfn(entry) + ((start & mask) >> range->page_shift); - for (; addr < end; addr += size, i++, pfn += pfn_inc) + pfn = pte_pfn(entry) + ((start & mask) >> PAGE_SHIFT); + for (; addr < end; addr += PAGE_SIZE, i++, pfn++) range->pfns[i] = hmm_device_entry_from_pfn(range, pfn) | cpu_flags; hmm_vma_walk->last = end; @@ -857,14 +844,13 @@ static void hmm_pfns_clear(struct hmm_range *range, */ int hmm_range_register(struct hmm_range *range, struct hmm_mirror *mirror) { - unsigned long mask = ((1UL << range->page_shift) - 1UL); struct hmm *hmm = mirror->hmm; unsigned long flags; range->valid = false; range->hmm = NULL; - if ((range->start & mask) || (range->end & mask)) + if ((range->start & (PAGE_SIZE - 1)) || (range->end & (PAGE_SIZE - 1))) return -EINVAL; if (range->start >= range->end) return -EINVAL; @@ -971,16 +957,6 @@ long hmm_range_fault(struct hmm_range *range, unsigned int flags) if (vma == NULL || (vma->vm_flags & device_vma)) return -EFAULT; - if (is_vm_hugetlb_page(vma)) { - if (huge_page_shift(hstate_vma(vma)) != - range->page_shift && - range->page_shift != PAGE_SHIFT) - return -EINVAL; - } else { - if (range->page_shift != PAGE_SHIFT) - return -EINVAL; - } - if (!(vma->vm_flags & VM_READ)) { /* * If vma do not allow read access, then assume that it |