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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Baoquan He , Pasha Tatashin , Miaohe Lin , Naoya Horiguchi , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, rmikey@meta.com, riel@surriel.com, kernel-team@meta.com, Kiryl Shutsemau Subject: Re: [PATCH v2] kexec: keep the next kernel off hardware-poisoned pages Message-ID: References: <20260730-kexec_posioned-v2-1-f92d18551f64@debian.org> <2vxzecgj6od4.fsf@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2vxzecgj6od4.fsf@kernel.org> X-Debian-User: leitao X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 205C61A0004 X-Stat-Signature: gywtumpk68h4apmo59qxuqu4f598fxjo X-Rspam-User: X-HE-Tag: 1785521482-122689 X-HE-Meta: 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 M4r9kpSC lWrjlNh/oJcfD0Zwc7Mt7M6VbkeJwAC9YrgIGVRbkMReMPiH1sdqEyoJjqEwig5STm2BnAB24gFBVLJnEFgXz2hn4f1T4NMyz80L7OpyzqX3cUTIddFnqbNjlrhh8BzjmYcc+dYqnKtIid/Uihj90xRecNUHjjN6kLaPPMdI+81OQUg5Ya1HcnRHEjo7kKXL3ICj0GHMc1X5ieuVhjRWgBlZmiFrgjEQDjyOfLQOF5boG9zDbnOQV/owEBSYgUQfnJXom9KpSu0CpH6Vwo01xHcO8ZKW/q1+fo0bs3HAm8PoB8XkASwRC8tg5UeE6xQP2cndeVSnO7+ythprZfW73nm5KBLzvhE0AJpvh Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jul 31, 2026 at 07:49:27PM +0200, Pratyush Yadav wrote: > > + * return phys_addr_t, thus this "extra" parameter, instead of returning > > + * the hit. > > + */ > > +bool range_contains_hwpoison(phys_addr_t start, unsigned long size, > > + phys_addr_t *poison) > > Perhaps > > phys_addr_t range_last_hwpoison(phys_addr_t start, unsigned long size) ? > > And if no poisoned page lands here then a default of 0 or ~0UL? That was my initial preference, but hypothetically phys_addr_t 0 could be a poisoned page. I hadn't considered ~0UL as a sentinel — that should work and is a good suggestion. let me prototype. Thanks for the review. --breno