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SubjectRe: [PATCH 06/11] mm: page_vma_mapped_walk(): crossing page table boundary
On Thu, 10 Jun 2021, Kirill A. Shutemov wrote:
> On Wed, Jun 09, 2021 at 11:44:10PM -0700, Hugh Dickins wrote:
> > page_vma_mapped_walk() cleanup: adjust the test for crossing page table
> > boundary - I believe pvmw->address is always page-aligned, but nothing
> > else here assumed that;
>
> Maybe we should just get it aligned instead? (PMD_SIZE - PAGE_SIZE) is not
> most obvious mask calculation.

Would you prefer it with another line of comment after the
/* Did we cross page table boundary? */

Maybe,
/* Is address always page-aligned? No need to assume that. */

I just don't see the point in forcing alignment when the test is good
(and don't know for sure whether address is always aligned there or not).

I prefer to leave it as is, just letting the commit message document it.

>
> > and remember to reset pvmw->pte to NULL after
> > unmapping the page table, though I never saw any bug from that.
>
> Okay, it's fair enough.

Thanks,
Hugh

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