mm/hugetlb: handle races in alloc_huge_page and hugetlb_reserve_pages
alloc_huge_page and hugetlb_reserve_pages use region_chg to
calculate the number of pages which will be added to the reserve
map. Subpool and global reserve counts are adjusted based on
the output of region_chg. Before the pages are actually added
to the reserve map, these routines could race and add fewer
pages than expected. If this happens, the subpool and global
reserve counts are not correct.
Compare the number of pages actually added (region_add) to those
expected to added (region_chg). If fewer pages are actually added,
this indicates a race and adjust counters accordingly.
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
1 file changed
