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Perez de Azpillaga" Cc: Mike Rapoport , Andrew Morton , Kees Cook , Alexander Graf , Changyuan Lyu , Tony Luck , "Guilherme G. Piccoli" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Pratyush Yadav , Pasha Tatashin , kexec@lists.infradead.org Subject: Re: [RFC PATCH 0/2] memblock: keep reserve_mem regions out of KHO bootmem In-Reply-To: <20261021211058.83483-1-azpijr@gmail.com> (Jose A. Perez de Azpillaga's message of "Wed, 21 Oct 2026 23:10:44 +0200") References: <20261021211058.83483-1-azpijr@gmail.com> Date: Thu, 22 Oct 2026 15:37:12 +0200 Message-ID: <2vxzqzhhg8l3.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Rspamd-Queue-Id: 104241C000A X-Stat-Signature: 67uyiwk46s45n8mpoj9wgsxtwrj4m8be X-Rspamd-Server: rspam01 X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-HE-Tag: 1792676237-295006 X-HE-Meta: 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 EYplmShq rXYnGv66nOsTGUmmghZEEVn1mEKk5XjgSkFy+88vjZDd5Joam7p4z5+FaVZcpVuqdJsFM44i1nkzbRfRFT6kIVn6WEFFGPMfAIVvTDDvLQYy+HaXqej5/DOS16hYfJIPVtslv3hWBIbfahUnN9kHw2IQj8YgZtesnizbkqweIUnJ6WRqDWIAGQHbNYuOWBdusGQ76owFectxFwvlu0V1X0IGe4J6HpFkI8pwOR5cw2EcecPnSjpHRlmM+vz89dl9bMq6RK+km9pyYQJFrx9Q5wiX7SScBt//w81qw 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, Oct 21 2026, Jose A. Perez de Azpillaga wrote: > On a KHO boot, a reserve_mem= region that can't be revived (new name, > size or alignment) can be allocated from KHO bootmem, which the next > kernel boots out of. With CONFIG_KEXEC_HANDOVER_DEBUG preserving it > fails; without it, the next kernel's memmap ends up on top of it. What's your use-case? Why are you adding new reserve_mem regions after cold boot? I'd rather avoid making purely theoretical fixes. [...] -- Regards, Pratyush Yadav