mm/gup_test: prevent overflow in GUP batch calculation

Hi Kiryl! On 9/1/26 4:05 PM, Kiryl Shutsemau wrote: > On Tue, Sep 01, 2026 at 02:04:51PM +0530, Sarthak Sharma wrote: » __gup_test_ioctl() calculates the end of a GUP batch using: » » next = addr