Re: [PATCH] docs/mm: add VMA locks documentation

[Bagas Sanjaya <bagasdotme@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 1136 bytes --]

On Fri, Nov 08, 2024 at 12:34:23PM +0000, Lorenzo Stoakes wrote:
> On Fri, Nov 08, 2024 at 12:29:15PM +0000, Lorenzo Stoakes wrote:
> > On Fri, Nov 08, 2024 at 07:25:38PM +0700, Bagas Sanjaya wrote:
> > > On Thu, Nov 07, 2024 at 07:01:37PM +0000, Lorenzo Stoakes wrote:
> > > > +.. note:: In instances where the architecture supports fewer page tables than
> > > > +   five the kernel cleverly 'folds' page table levels, that is skips them within
> > > > +   the logic, regardless we can act as if there were always five.
> > >
> > > What are being skipped if e.g. we only have 3 or 4 page tables?
> > >
> > > Confused...
> >
> > Page table levels, see [0].
> >
> > Typically achieved through stubbing functions out, etc. So in the code you
> > actually write and _conceptually_ there are five levels, only in the final
> > compile you might have things like p4d_present(), p4d_clear() etc. squashed by
> > the compiler into nothing.
> 
> I have updated this note to be a little clearer and to explicitly state
> this. Thanks!

Thanks for clarifying.

-- 
An old man doll... just what I always wanted! - Clara

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 228 bytes --]