mm/hugetlb: fix huge page reservation leak in private mapping error paths

Error paths in hugetlb_cow() and hugetlb_no_page() may free a newly
allocated huge page.

If a reservation was associated with the huge page, alloc_huge_page()
consumed the reservation while allocating.  When the newly allocated
page is freed in free_huge_page(), it will increment the global
reservation count.  However, the reservation entry in the reserve map
will remain.

This is not an issue for shared mappings as the entry in the reserve map
indicates a reservation exists.  But, an entry in a private mapping
reserve map indicates the reservation was consumed and no longer exists.
This results in an inconsistency between the reserve map and the global
reservation count.  This 'leaks' a reserved huge page.

Create a new routine restore_reserve_on_error() to restore the reserve
entry in these specific error paths.  This routine makes use of a new
function vma_add_reservation() which will add a reserve entry for a
specific address/page.

In general, these error paths were rarely (if ever) taken on most
architectures.  However, powerpc contained arch specific code that that
resulted in an extra fault and execution of these error paths on all
private mappings.

Fixes: 67961f9d ("mm/hugetlb: fix huge page reserve accounting for private mappings)
Link: http://lkml.kernel.org/r/1476933077-23091-2-git-send-email-mike.kravetz@oracle.com


Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reported-by: Jan Stancek <jstancek@redhat.com>
Tested-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kirill A . Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>