On Wed, 8 Jul 2026 12:29:05 +0530 Sayali Patil <[email protected]> wrote:
> Some MM selftests attempt to configure the amount of
> HugeTLB pages of different sizes by writing to nr_hugepages.
>
> PowerPC hash MMU pSeries systems advertise gigantic hugepage sizes
> but do not support runtime allocation of such pages, writes
> to the corresponding nr_hugepages file fail with -EINVAL.
> This causes the test to bail out even though the failure is due
> to a platform limitation rather than the
> functionality being tested.
>
> Ignore -EINVAL when configuring nr_hugepages so that tests continue to
> run on systems where gigantic hugepage allocation is unsupported.
>
> Before patch:
> -------------------------
> running ./hugetlb-madvise
> -------------------------
> TAP version 13
> 1..1
> [INFO] detected hugetlb page size: 16777216 KiB
> [INFO] detected hugetlb page size: 16384 KiB
> ok 1 MADV_DONTNEED and MADV_REMOVE on hugetlb
> Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
> Bail out! /sys/kernel/mm/hugepages/hugepages-16777216kB/nr_hugepages
> write(0) failed: Invalid argument
> Totals: pass:0 fail:0 xfail:0 xpass:0 skip:0 error:0
> [FAIL]
>
> After patch:
> -------------------------
> running ./hugetlb-madvise
> -------------------------
> TAP version 13
> 1..1
> [INFO] detected hugetlb page size: 16777216 KiB
> [INFO] detected hugetlb page size: 16384 KiB
> ok 1 MADV_DONTNEED and MADV_REMOVE on hugetlb
> Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
> [PASS]
>
> Fixes: 27477b28b74f ("selftests/mm: hugepage_settings: add APIs to get and
> set nr_hugepages")
> Co-developed-by: David Hildenbrand (Arm) <[email protected]>
> Signed-off-by: David Hildenbrand (Arm) <[email protected]>
> Signed-off-by: Sayali Patil <[email protected]>
> ---
> .../testing/selftests/mm/hugepage_settings.c | 2 +-
> tools/testing/selftests/mm/vm_util.c | 26 ++++++++++++++++---
> tools/testing/selftests/mm/vm_util.h | 1 +
> 3 files changed, 24 insertions(+), 5 deletions(-)
>
Acked-by: Usama Arif <[email protected]>
