Re: [patch V3 1/2] x86/mm/pti: Handle unaligned address gracefully in pti_clone_pagetable()

[Joerg Roedel]

On Wed, Aug 28, 2019 at 11:54:55PM +0200, Thomas Gleixner wrote:
> --- a/arch/x86/mm/pti.c
> +++ b/arch/x86/mm/pti.c
> @@ -330,13 +330,15 @@ pti_clone_pgtable(unsigned long start, u
>  
>  		pud = pud_offset(p4d, addr);
>  		if (pud_none(*pud)) {
> -			addr += PUD_SIZE;
> +			WARN_ON_ONCE(addr & ~PUD_MASK);
> +			addr = round_up(addr + 1, PUD_SIZE);
>  			continue;
>  		}
>  
>  		pmd = pmd_offset(pud, addr);
>  		if (pmd_none(*pmd)) {
> -			addr += PMD_SIZE;
> +			WARN_ON_ONCE(addr & ~PMD_MASK);
> +			addr = round_up(addr + 1, PMD_SIZE);
>  			continue;
>  		}
>

Reviewed-by: Joerg Roedel <jroedel@xxxxxxx>