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b=gPVSqwtsS4+iVC1025PcArimiK7ZsHRGSfLl/9vWj0OFRDu3FHfI2SLPjoziXSFGd tCksDvCxQdG6NdNpsUcKUfbfZFW61q1znvRx0Qpmku3wmIYklPB4XX6DhKQYXGaKsu Xbu8aacc3lRj6gAcSN/lrVVf01PuoNk5mZjnlcQJFKlFMAcHSyCTa73yoMurgPflNC +UAz8LhHJ0LNk3h5Bm4EgtdH5kI6Vqv03I2ajqOCLPe4CMU3GGMoZS/guUm46MlYOd hXbG+m9rvuttdDpzt4Bx5O6QJ2qbbqx/z/Rw2dFI2uULXT/u3EvIyRvFjV0WfHh5Rq hE44LMljP4V9g== From: Pratyush Yadav To: "Mike Rapoport (Microsoft)" Cc: Jonathan Corbet , Pasha Tatashin , Pratyush Yadav , Alexander Graf , Andrew Morton , Chen Pei , George Guo , Kexin Liu , Randy Dunlap , Shuah Khan , Sourabh Jain , kexec@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v3 1/5] kho: reject zero bootmem scale In-Reply-To: <20261112-kho-bootmem-sizing-v3-1-f0c8d00295d5@kernel.org> (Mike Rapoport's message of "Thu, 12 Nov 2026 12:38:53 +0200") References: <20261112-kho-bootmem-sizing-v3-0-f0c8d00295d5@kernel.org> <20261112-kho-bootmem-sizing-v3-1-f0c8d00295d5@kernel.org> Date: Thu, 12 Nov 2026 14:30:40 +0100 Message-ID: <2vxzjymigosf.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 132C2120015 X-Stat-Signature: 519jgiqrh5efp1jkm9hk3orc4eiawwor X-Rspam-User: X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=4.0.1 X-HE-Tag: 1794490245-704598 X-HE-Meta: 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 f4syi/Lo b9AGVzqjD3tX5hPgAzq2NOpzACNqKxlocLrWw5APxWqB9POwdMP/O3jdBfvdJzbyOuQuQ0E0EOTR7T2XdJwTttN/0KmUwga09vAa1wPitefOgM8Wju+J/E0V3MwcY1DqbKlMGlcnN3q/V6gmPZej1auwqXJb1W58Anj030Q2nMdS0mIq9OGv6PsaNae1WG4rRnEHv3X3usvGs+T0EdWcoU0u+sFKwns4nFjA4mIJ2dC3y+l8= 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 Thu, Nov 12 2026, Mike Rapoport (Microsoft) wrote: > kho_bootmem=0% sets bootmem_scale to 0, and then the bootmem areas are > sized using the explicit sizes that default to 0. KHO remains enabled, > but there is no usable bootmem to load the next kernel. > > Reject zero scale the same way zero explicit sizes are rejected. > > Fixes: 3dc92c311498 ("kexec: add Kexec HandOver (KHO) generation helpers") > Signed-off-by: Mike Rapoport (Microsoft) Reviewed-by: Pratyush Yadav (Google) [...] -- Regards, Pratyush Yadav