tree 7db76ed2366fceaa24eb69e4ff38319588f0751a
parent e125fe405abedc1dc8a5b2229b80ee91c1434015
author YueHaibing <yuehaibing@huawei.com> 1538779904 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1538782324 -0700

mm/gup_benchmark: fix unsigned comparison to zero in __gup_benchmark_ioctl

get_user_pages_fast() will return negative value if no pages were pinned,
then be converted to a unsigned, which is compared to zero, giving the
wrong result.

Link: http://lkml.kernel.org/r/20180921095015.26088-1-yuehaibing@huawei.com
Fixes: 09e35a4a1ca8 ("mm/gup_benchmark: handle gup failures")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>