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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: 09e35a4a1c ("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>
hifive-unleashed-5.1
YueHaibing 2018-10-05 15:51:44 -07:00 committed by Greg Kroah-Hartman
parent e125fe405a
commit 5189686457
1 changed files with 2 additions and 1 deletions
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3
mm/gup_benchmark.c
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@ -19,7 +19,8 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
struct gup_benchmark *gup)
{
ktime_t start_time, end_time;
unsigned long i, nr, nr_pages, addr, next;
unsigned long i, nr_pages, addr, next;
int nr;
struct page **pages;
nr_pages = gup->size / PAGE_SIZE;