On 09/02/2020 05:12 PM, Aneesh Kumar K.V wrote:
> The seems to be missing quite a lot of details w.r.t allocating
> the correct pgtable_t page (huge_pte_alloc()), holding the right
> lock (huge_pte_lock()) etc. The vma used is also not a hugetlb VMA.
>
> ppc64 do have runtime checks within CONFIG_DEBUG_VM for most of these.
> Hence disable the test on ppc64.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
> ---
> mm/debug_vm_pgtable.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index b53903fdee85..9afa1354326b 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -811,6 +811,7 @@ static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
> #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
> }
>
> +#ifndef CONFIG_PPC_BOOK3S_64
> static void __init hugetlb_advanced_tests(struct mm_struct *mm,
> struct vm_area_struct *vma,
> pte_t *ptep, unsigned long pfn,
> @@ -853,6 +854,7 @@ static void __init hugetlb_advanced_tests(struct mm_struct *mm,
> pte = huge_ptep_get(ptep);
> WARN_ON(!(huge_pte_write(pte) && huge_pte_dirty(pte)));
> }
> +#endif
> #else /* !CONFIG_HUGETLB_PAGE */
> static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
> static void __init hugetlb_advanced_tests(struct mm_struct *mm,
> @@ -1065,7 +1067,9 @@ static int __init debug_vm_pgtable(void)
> pud_populate_tests(mm, pudp, saved_pmdp);
> spin_unlock(ptl);
>
> +#ifndef CONFIG_PPC_BOOK3S_64
> hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
> +#endif
>
> spin_lock(&mm->page_table_lock);
> p4d_clear_tests(mm, p4dp);
>
Is it still required now that DEBUG_VM_PGTABLE has been dropped from powerpc
or you would like to re-enabled it back ?
https://lore.kernel.org/linuxppc-dev/159913592797.5893.5829441560236719450.b4-ty@xxxxxxxxxxxxxx/T/#m6d890e2fe84cf180cb875fae5f791e9c83db8d30
