Re: [PATCH v9 01/10] memblock: Introduce MEMBLOCK_LLMAP

[Mike Rapoport]

On Mon, Sep 07, 2026 at 10:50:12AM +0100, Vincent Donnefort wrote:
> On Sun, Sep 06, 2026 at 10:33:11PM +0300, Mike Rapoport wrote:
> > On Wed, Sep 02, 2026 at 11:47:03AM +0100, Vincent Donnefort wrote:
> > > Keeping last-level mappings is interesting on some architectures as it
> > > allows mapping/unmapping pages from the kernel direct map without the
> > > risk of splitting blocks which, under the break-before-make rule, may
> > > trigger page-faults the kernel can't handle.
> > > 
> > > However, mapping the entire direct map at PTE-level is costly. So
> > > instead, create a new memblock flag MEMBLOCK_LLMAP to enable the system
> > 
> > I believe MEMBLOCK_PTE_MAP sounds more descriptive.
> 
> The idea was to have something close from NOMAP, to emphasis it is one or the
> other. But PTE_MAP sounds good too.

Could be PTEMAP if you prefer.
My point was that unlike PTE, "LL" is not perceived as last-level, it
should be looked up.
 
> > > to decide which region must be covered by mappings up to the last-level.
> > > 
> > > Signed-off-by: Vincent Donnefort <vdonnefort@xxxxxxxxxx>
>
> -- 
> Vincent

-- 
Sincerely yours,
Mike.