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It's not really possible to start diagnosing this without knowing the actual error. Also update the mlock2 helper to behave like libc would by setting errno and returning -1. Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-12-dec210a658f5@google.com Signed-off-by: Brendan Jackman <jackmanb@google.com> Cc: Dev Jain <dev.jain@arm.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Mateusz Guzik <mjguzik@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>