Re: [PATCH 01/10] x86/mm: drop order parameter from free_pagetable()

["David Hildenbrand (Arm)" <david@kernel.org>]

>  	/* free a pte table */
> -	free_pagetable(pmd_page(*pmd), 0);
> +	free_pagetable(pmd_page(*pmd));
>  	spin_lock(&init_mm.page_table_lock);
>  	pmd_clear(pmd);
>  	spin_unlock(&init_mm.page_table_lock);
> @@ -1078,7 +1075,7 @@ static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
>  	}
>  
>  	/* free a pmd table */
> -	free_pagetable(pud_page(*pud), 0);
> +	free_pagetable(pud_page(*pud));
>  	spin_lock(&init_mm.page_table_lock);
>  	pud_clear(pud);
>  	spin_unlock(&init_mm.page_table_lock);
> @@ -1096,7 +1093,7 @@ static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
>  	}
>  
>  	/* free a pud table */
> -	free_pagetable(p4d_page(*p4d), 0);
> +	free_pagetable(p4d_page(*p4d));
>  	spin_lock(&init_mm.page_table_lock);
>  	p4d_clear(p4d);
>  	spin_unlock(&init_mm.page_table_lock);
> 

Sashiko raises some pre-existing things around use-after free that I will just
ignore. We don't expect anybody to walk pages tables we are tearing down here,
and we'd have to wait for the TLB flush to get this right. And I don't see the
need to.

-- 
Cheers,

David