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Wed, 21 May 2025 08:48:56 +0000 Date: Wed, 21 May 2025 10:48:55 +0200 From: Oscar Salvador To: Mike Rapoport Cc: Changyuan Lyu , akpm@linux-foundation.org, bhe@redhat.com, chrisl@kernel.org, graf@amazon.com, jasonmiu@google.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pasha.tatashin@soleen.com Subject: Re: [PATCH 1/2] memblock: show a warning if allocation in KHO scratch fails Message-ID: References: <20250521070310.2478491-1-changyuanl@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Action: no action X-Rspamd-Queue-Id: 192BC2125A X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-1.51 / 50.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; RCPT_COUNT_SEVEN(0.00)[11]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; MISSING_XM_UA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_BLOCKED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[localhost.localdomain:mid]; RCVD_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[suse.de:+] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250521_014901_831176_F881AF1F X-CRM114-Status: GOOD ( 10.79 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On Wed, May 21, 2025 at 10:43:15AM +0300, Mike Rapoport wrote: > I think we should just make sparse_init_nid() panic or at least change > "sparse_init_nid: node[0] memory map backing failed. Some memory will not be available." > to something more visible and clear. Panicking the system seems a bit too harsh. Those sections will not be initialized, and sure you will lose some memory, but still. I think that making sure that subsection_map_init() does not access non-initialized values is enough. Because wrt. error message, I am not sure it can get more clear that we failed we allocate memory to back the section and so that section will not be activated :-) -- Oscar Salvador SUSE Labs