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

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:

quoted

On Wed, Sep 02, 2026 at 11:47:03AM +0100, Vincent Donnefort wrote:

quoted

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.
 

quoted

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to decide which region must be covered by mappings up to the last-level.

Signed-off-by: Vincent Donnefort <redacted>

-- 
Vincent

-- 
Sincerely yours,
Mike.