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b=Zlr8cphpaQd3nqY4dD/M8LKmVfhEwBhg/RXnFS8Dbd42j21budIL80Fj83ujynYBi xrkpXbt/vgXXJ3zbCIgd0vytWH9UFZRo+kWYg6+zk3Dgh5sXkP6sxBNtPVRWMc7kgU 7c0cXcpkCgnk34WxtxAQP15i7VF+f+o9Op3gqEYw8sVFIZUZZKKEE/DiCEBd5NJmBL eqWix0PI/yHN1v1kle17XH0UgF/k5g+OojdNRy9zlUqHohW/kmiciG1CH3WaxOOynl GtOjVUG+IaqnqKJMnuActvv+XKVHz8jIHWFruwvUHIhP9DWwGFEUc3P4bbqJVKIINp h+RZkJC+eVaDQ== Date: Sun, 15 Nov 2026 21:14:25 +0200 From: Mike Rapoport To: Vincent Donnefort Cc: catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, m.szyprowski@samsung.com, jenswi@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, mark.rutland@arm.com, robin.murphy@arm.com, hch@lst.de, ryan.roberts@arm.com, sumit.garg@kernel.org, sudeep.holla@kernel.org, ardb@kernel.org, thierry.reding@kernel.org, david@kernel.org, danielmentz@google.com, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, iommu@lists.linux.dev, op-tee@lists.trustedfirmware.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/8] memblock: Introduce MEMBLOCK_PTEMAP Message-ID: References: <20261111110738.872947-1-vdonnefort@google.com> <20261111110738.872947-2-vdonnefort@google.com> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261111110738.872947-2-vdonnefort@google.com> X-Stat-Signature: 4qmjw7ezro6eyztgmrg74ygp3e599xey X-Rspamd-Queue-Id: 887EAA000E X-Rspam-User: X-Rspamd-Server: rspam08 X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1794770076-511221 X-HE-Meta: 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 TifNPWkX D4w+4pd32eV7aOSQXVJhmU4XQ0RAoS2iwgcS3KMRrNAdQngPARC//dkp2D+9qe2xdSA/CXlKwn9MszrtEv+5gP1CAEw0YuqTyWwUcpaVQ+sCmmMgM/qu7GK3+i1DDNjfvEIBqekDgsblG4CAlHTReJWA5EfYcnf5LrQeQAo4jW9Fd6RflCZRxSzWkpTRFQBmQx6PuZXd5G+KHvrQ/mHAm21PuejS1iH9qd8XKkMjXY0dAoNQqteLoJgdb/FlQgOy+OiEuKjzfr/nhR+odQTe0mbZnF8RtJ0Ih6SCpBpY5nc9/fRiDXi+IqTxFG2PB6128txH3FbgzU8/zITkUP+fYU7+C8Bc/PiY80NvUmrsGhLDC8r62zsc1BRSZixhDIVm5F09XEF2YNHEkhtfoFsa2UQRCGI9sBc7mgNZTIzqQJkZArNjIoBKUK6KydBOnvxOz/yrTlMMDa1btq7w= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Nov 11, 2026 at 11:07:31AM +0000, Vincent Donnefort wrote: > Keeping PTE-level mappings is interesting for arm64 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_PTEMAP to selectively apply > a PTE-level mapping. > > Signed-off-by: Vincent Donnefort Acked-by: Mike Rapoport (Microsoft) > --- > include/linux/memblock.h | 9 +++++++++ > mm/memblock.c | 39 +++++++++++++++++++++++++++++++++++++-- > 2 files changed, 46 insertions(+), 2 deletions(-) -- Sincerely yours, Mike.