Re: [PATCH v1 1/2] selftests/mm: hugetlb_fault_after_madv: use default hguetlb page size

[Breno Leitao]

On Thu, Sep 26, 2024 at 05:20:43PM +0200, David Hildenbrand wrote:
> We currently assume that the hugetlb page size is 2 MiB, which is
> why we mmap() a 2 MiB range.
> 
> Is the default hugetlb size is larger, mmap() will fail because the
> range is not suitable. If the default hugetlb size is smaller (e.g.,
> s390x), mmap() will fail because we would need more than one hugetlb
> page, but just asserted that we have exactly one.
> 
> So let's simply use the default hugetlb page size instead of hard-coded
> 2 MiB, so the test isn't unconditionally skipped on architectures like
> s390x.
> 
> Before this patch on s390x:
> $ ./hugetlb_fault_after_madv
> 	1..0 # SKIP Failed to allocated huge page
> 
> With this change on s390x:
> 	$ ./hugetlb_fault_after_madv
> 
> While at it, make "huge_ptr" static.
> 
> Reported-by: Mario Casquero <mcasquer@xxxxxxxxxx>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>

Reviewed-by: Breno Leitao <leitao@xxxxxxxxxx>