With this change, userfaultfd fails to build with undefined referenceswap() error: userfaultfd.c: In function ‘userfaultfd_stress’:userfaultfd.c:1530:17: warning: implicit declaration of function ‘swap’; did you mean ‘swab’? [-Wimplicit-function-declaration]1530 | swap(area_src, area_dst);| ^~~~|…Read moreuse swap() to make code cleaner”