Re: [PATCH v6 16/19] selftests/mm: add khugepaged race harness

[Zenghui Yu]

On 10/8/26 4:18 PM, Muhammad Usama Anjum wrote:

> On 08/10/2026 8:30 am, Zenghui Yu wrote:
> > On 9/19/26 8:24 AM, Kiryl Shutsemau wrote:
> >
> > > +		} else {	/* madvise */
> > > +			while (now_ms() < end_ms && !corrupted) {
> > > +				for (i = 0; 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.

I forgot to mention that this can be fixed like fd5295afae91.

Thanks,
Zenghui