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| author | Wei Yang <richard.weiyang@linux.alibaba.com> | 2020-10-14 01:53:57 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-14 03:38:31 +0200 |
| commit | f9d86a60572295ebb53c87a4305dc89b487711bd (patch) | |
| tree | 1d6a67b92abb7facc398f9aa8850648f19527499 | |
| parent | mm: simplify PageDoubleMap with PF_SECOND policy (diff) | |
| download | linux-f9d86a60572295ebb53c87a4305dc89b487711bd.tar.xz linux-f9d86a60572295ebb53c87a4305dc89b487711bd.zip | |
mm/mmap: leave adjust_next as virtual address instead of page frame number
Instead of converting adjust_next between bytes and pages number, let's
just store the virtual address into adjust_next.
Also, this patch fixes one typo in the comment of vma_adjust_trans_huge().
[vbabka@suse.cz: changelog tweak]
Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Link: http://lkml.kernel.org/r/20200828081031.11306-1-richard.weiyang@linux.alibaba.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/huge_memory.c | 4 | ||||
| -rw-r--r-- | mm/mmap.c | 8 |
2 files changed, 6 insertions, 6 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index ec0f0cc49545..65c289c13b58 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2306,13 +2306,13 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma, /* * If we're also updating the vma->vm_next->vm_start, if the new - * vm_next->vm_start isn't page aligned and it could previously + * vm_next->vm_start isn't hpage aligned and it could previously * contain an hugepage: check if we need to split an huge pmd. */ if (adjust_next > 0) { struct vm_area_struct *next = vma->vm_next; unsigned long nstart = next->vm_start; - nstart += adjust_next << PAGE_SHIFT; + nstart += adjust_next; if (nstart & ~HPAGE_PMD_MASK && (nstart & HPAGE_PMD_MASK) >= next->vm_start && (nstart & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE <= next->vm_end) diff --git a/mm/mmap.c b/mm/mmap.c index 0f3ca5257335..57de816e2614 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -758,7 +758,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, * vma expands, overlapping part of the next: * mprotect case 5 shifting the boundary up. */ - adjust_next = (end - next->vm_start) >> PAGE_SHIFT; + adjust_next = (end - next->vm_start); exporter = next; importer = vma; VM_WARN_ON(expand != importer); @@ -768,7 +768,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, * split_vma inserting another: so it must be * mprotect case 4 shifting the boundary down. */ - adjust_next = -((vma->vm_end - end) >> PAGE_SHIFT); + adjust_next = -(vma->vm_end - end); exporter = vma; importer = next; VM_WARN_ON(expand != importer); @@ -840,8 +840,8 @@ again: } vma->vm_pgoff = pgoff; if (adjust_next) { - next->vm_start += adjust_next << PAGE_SHIFT; - next->vm_pgoff += adjust_next; + next->vm_start += adjust_next; + next->vm_pgoff += adjust_next >> PAGE_SHIFT; } if (root) { |