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Peter Anvin" , "Vlastimil Babka" , "Mike Rapoport" , "Arnd Bergmann" , "Andrew Morton" , "Baoquan He" , "Ilias Apalodimas" , "Liam R. Howlett" , "Lorenzo Stoakes" Cc: robh@kernel.org, kexec@lists.infradead.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, x86@kernel.org, conor+dt@kernel.org In-Reply-To: <20260922041321.233986-3-pratyush@kernel.org> References: <20260922041321.233986-1-pratyush@kernel.org> <20260922041321.233986-3-pratyush@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 22 Sep 2026 04:19:16 +0000 Message-Id: <20260922041916.A84161F00893@smtp.kernel.org> X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 5FBEE20002 X-Stat-Signature: 86ofzgi1hu6cgpe7ac767tgxxfungmnp X-HE-Tag: 1790050759-408987 X-HE-Meta: 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 UryjpFeg 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > From: "Pratyush Yadav (Google)" >=20 > The term "KHO scratch" is vague. It does not accurately describe what > the memory is for. Generally, scratch is for things that don't contain > anything useful. This is not true. >=20 > For memblock, KHO_SCRATCH is the _only_ useful memory during a KHO boot. > It is memory passed by the previous kernel that is guaranteed to have no > preserved pages, and so is the only thing safe to allocate from early in > boot. >=20 > In addition, KHO now has the ability to discover other "scratch" areas. > These aren't directly passed by the previous kernel. Instead, they are > found by searching the KHO preserved memory map. >=20 > Memblock does not care about the difference between the two. From > memblock's perspective, both are memory areas with no preservations and > so they are safe to allocate from before KHO fully initializes. >=20 > Rename MEMBLOCK_KHO_SCRATCH to MEMBLOCK_KHO_NOPRSRV. This name clearly > shows what the memory is for from memblock's perspective. Update > memblock functions and comments that refer to scratch to use noprsrv. >=20 > There are no functional changes apart from the flag name change in > debugfs. >=20 > Signed-off-by: Pratyush Yadav (Google) Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260922041321.2339= 86-1-pratyush@kernel.org?part=3D2