hugetlb: chg cannot become less than 0
chg is unsigned, so it cannot be less than 0. Also, since region_chg returns long, let vma_needs_reservation() forward this to alloc_huge_page(). Store it as long as well. all callers cast it to long anyway. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Adam Litke <agl@us.ibm.com> Cc: Johannes Weiner <hannes@saeurebad.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -918,7 +918,7 @@ static void return_unused_surplus_pages(struct hstate *h,
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* an instantiated the change should be committed via vma_commit_reservation.
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* No action is required on failure.
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*/
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static int vma_needs_reservation(struct hstate *h,
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static long vma_needs_reservation(struct hstate *h,
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struct vm_area_struct *vma, unsigned long addr)
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{
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struct address_space *mapping = vma->vm_file->f_mapping;
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@ -933,7 +933,7 @@ static int vma_needs_reservation(struct hstate *h,
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return 1;
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} else {
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int err;
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long err;
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pgoff_t idx = vma_hugecache_offset(h, vma, addr);
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struct resv_map *reservations = vma_resv_map(vma);
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@ -969,7 +969,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
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struct page *page;
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struct address_space *mapping = vma->vm_file->f_mapping;
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struct inode *inode = mapping->host;
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unsigned int chg;
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long chg;
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/*
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* Processes that did not create the mapping will have no reserves and
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