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b=Z+19VGW689YQmfWzj3ws0xOaW1zvWCBaLeDwyOtrCW/QsH7JreF9icWorSeBkmMLm wHoxMCxl8Dg3oIpmElK2vJr74pnxB2DA/ebUS0FIepbIVXKfAZTy0IyCznsd6sY7a9 4SO5+2Je1YUSglE89KLJdEGJUdp+SuFt5KDobPMjIxamW3ol4YyJCmzghmcmUWc0tp HEW+Joe4fGhn0gfxKC6TkO/vdylolOqcDsta2xp8IZ3UqJlcA/4Q5B3573slxqg0Cv TmXA0ah/tHDPUAfB090eZhZfGcZJ6fFNAw7BoxQNFsmVtENhB0quEZPwr8ghmHKVQV Pm/SLNhnO0E3A== Date: Tue, 20 Jan 2026 15:06:28 +0200 From: Mike Rapoport To: Andrew Morton Cc: Pratyush Yadav , Alexander Graf , Pasha Tatashin , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Suren Baghdasaryan Subject: Re: [PATCH v2 1/2] kho: use unsigned long for nr_pages Message-ID: References: <20260116112217.915803-1-pratyush@kernel.org> <20260116112217.915803-2-pratyush@kernel.org> <20260116142635.b90464ed9772c146a9842370@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260116142635.b90464ed9772c146a9842370@linux-foundation.org> X-Rspam-User: X-Stat-Signature: mnkkycu1kze81ofi6p1snnzuinjqh5no X-Rspamd-Queue-Id: 07E1B4000C X-Rspamd-Server: rspam04 X-HE-Tag: 1768914395-8365 X-HE-Meta: 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 FMKxFuRP MzhHg2PDrc9FOvPIixfhyiQfaOQ9mM1RzICMeFFequSw+Sppb6bZ2ah95zKuRn5UFbIG3ntyeTwg+h3pKL+andJbSeZsO6fs3hL8dbEALJwiZWcVpL7ik0Y8bBBGFd0sw4c3oxN6GzynrsFgnIexBMu3lIquFIz/rM+nSLUVUKfzgQwPJ2WWx9SFkBsfON/yazyxFMMLGyw6+AcN+ksR12jEffzk6/5uwazxiDP32EUdLI2pdXK5bM+VUWZx558IKcr9dY8zrDcg05HnZgz/wXx7hByRUM3CNx15hBUecWFdiPg21fajrwuzyOl2DU827aJK+ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jan 16, 2026 at 02:26:35PM -0800, Andrew Morton wrote: > On Fri, 16 Jan 2026 11:22:14 +0000 Pratyush Yadav wrote: > > > With 4k pages, a 32-bit nr_pages can span up to 16 TiB. While it is a > > lot, there exist systems with terabytes of RAM. gup is also moving to > > using long for nr_pages. Use unsigned long and make KHO future-proof. > > We can expect people to be using LTS kernel five years from now, > perhaps much longer. Machines will be bigger then! > > IOW, shouldn't we backport this? The latest LTS is 6.12 that still does not have KHO, I don't think it makes sense to backport this to 6.18. -- Sincerely yours, Mike.