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hugetlb: chg cannot become less than 0

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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>
This commit is contained in:
Roel Kluin 2009-03-31 15:23:15 -07:00 committed by Linus Torvalds
parent d1d7487173
commit e2f17d9459
1 changed files with 3 additions and 3 deletions
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6
mm/hugetlb.c
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@ -918,7 +918,7 @@ static void return_unused_surplus_pages(struct hstate *h,
* an instantiated the change should be committed via vma_commit_reservation.
* No action is required on failure.
*/
static int vma_needs_reservation(struct hstate *h,
static long vma_needs_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
struct address_space *mapping = vma->vm_file->f_mapping;
@ -933,7 +933,7 @@ static int vma_needs_reservation(struct hstate *h,
return 1;
} else {
int err;
long err;
pgoff_t idx = vma_hugecache_offset(h, vma, addr);
struct resv_map *reservations = vma_resv_map(vma);
@ -969,7 +969,7 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
struct page *page;
struct address_space *mapping = vma->vm_file->f_mapping;
struct inode *inode = mapping->host;
unsigned int chg;
long chg;
/*
* Processes that did not create the mapping will have no reserves and