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i < nr_shared_areas; i++) { >> + madvise(region + i * hpage_pmd_size, >> + hpage_pmd_size, MADV_COLLAPSE); > > I got the following error when compiling it: > > khugepaged_race.c: In function ‘main’: > khugepaged_race.c:506:23: error: ‘MADV_COLLAPSE’ undeclared (first use in this function); did you mean ‘MADV_COLD’? > 506 | hpage_pmd_size, MADV_COLLAPSE); > | ^~~~~~~~~~~~~ > | MADV_COLD > khugepaged_race.c:506:23: note: each undeclared identifier is reported only once for each function it appears in > make: *** [../lib.mk:225: /data/code/mm/tools/testing/selftests/mm/khugepaged_race] Error 1 I've just tested with and without make headers on linux-next which has this patch and I've not received such error. If your system headers are old, running make headers can help. > > Thanks, > Zenghui -- Thanks, Usama