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Howlett" To: David Hildenbrand Cc: Peter Zijlstra , guoren@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org, torvalds@linux-foundation.org, paul.walmsley@sifive.com, palmer@dabbelt.com, anup@brainfault.org, atishp@atishpatra.org, oleg@redhat.com, kees@kernel.org, tglx@linutronix.de, will@kernel.org, mark.rutland@arm.com, brauner@kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org, edumazet@google.com, unicorn_wang@outlook.com, inochiama@outlook.com, gaohan@iscas.ac.cn, shihua@iscas.ac.cn, jiawei@iscas.ac.cn, wuwei2016@iscas.ac.cn, drew@pdp7.com, prabhakar.mahadev-lad.rj@bp.renesas.com, ctsai390@andestech.com, wefu@redhat.com, kuba@kernel.org, pabeni@redhat.com, josef@toxicpanda.com, dsterba@suse.com, mingo@redhat.com, boqun.feng@gmail.com, xiao.w.wang@intel.com, qingfang.deng@siflower.com.cn, leobras@redhat.com, jszhang@kernel.org, conor.dooley@microchip.com, samuel.holland@sifive.com, yongxuan.wang@sifive.com, luxu.kernel@bytedance.com, ruanjinjie@huawei.com, cuiyunhui@bytedance.com, wangkefeng.wang@huawei.com, qiaozhe@iscas.ac.cn, ardb@kernel.org, ast@kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-mm@kvack.org, linux-crypto@vger.kernel.org, bpf@vger.kernel.org, linux-input@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-serial@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, maple-tree@lists.infradead.org, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-atm-general@lists.sourceforge.net, linux-btrfs@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-nfs@vger.kernel.org, linux-sctp@vger.kernel.org, linux-usb@vger.kernel.org, linux-media@vger.kernel.org Subject: Re: [RFC PATCH V3 00/43] rv64ilp32_abi: Build CONFIG_64BIT kernel-self with ILP32 ABI Message-ID: Mail-Followup-To: "Liam R. Howlett" , David Hildenbrand , Peter Zijlstra , guoren@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org, torvalds@linux-foundation.org, paul.walmsley@sifive.com, palmer@dabbelt.com, anup@brainfault.org, atishp@atishpatra.org, oleg@redhat.com, kees@kernel.org, tglx@linutronix.de, will@kernel.org, mark.rutland@arm.com, brauner@kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org, edumazet@google.com, unicorn_wang@outlook.com, inochiama@outlook.com, gaohan@iscas.ac.cn, shihua@iscas.ac.cn, jiawei@iscas.ac.cn, wuwei2016@iscas.ac.cn, drew@pdp7.com, prabhakar.mahadev-lad.rj@bp.renesas.com, ctsai390@andestech.com, wefu@redhat.com, kuba@kernel.org, pabeni@redhat.com, josef@toxicpanda.com, dsterba@suse.com, mingo@redhat.com, boqun.feng@gmail.com, xiao.w.wang@intel.com, qingfang.deng@siflower.com.cn, leobras@redhat.com, jszhang@kernel.org, conor.dooley@microchip.com, samuel.holland@sifive.com, yongxuan.wang@sifive.com, luxu.kernel@bytedance.com, ruanjinjie@huawei.com, cuiyunhui@bytedance.com, wangkefeng.wang@huawei.com, qiaozhe@iscas.ac.cn, ardb@kernel.org, ast@kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-mm@kvack.org, linux-crypto@vger.kernel.org, bpf@vger.kernel.org, linux-input@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-serial@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, maple-tree@lists.infradead.org, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-atm-general@lists.sourceforge.net, linux-btrfs@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-nfs@vger.kernel.org, linux-sctp@vger.kernel.org, linux-usb@vger.kernel.org, linux-media@vger.kernel.org References: <20250325121624.523258-1-guoren@kernel.org> <20250325122640.GK36322@noisy.programming.kicks-ass.net> <0e1d8823-620f-420c-86a5-35495ccbd10f@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: 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 d78g8yEU j8YoxhWvb9jOFaraFLmmMRF9NKD/rdvvGpvnyYHg0AX/iAQMWgqkX3z021ElWMOpunvkC2+ZllY7oN1/k4UQJfXI40oGLy/zt/jVPx13qtnc+NNpS/DunvXOB3L1b6hJ23GcoJlJPu9epkoVA9EaKXBkNUN5npzdQQdhW 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: * David Hildenbrand [250325 14:52]: > On 25.03.25 13:26, Peter Zijlstra wrote: > > On Tue, Mar 25, 2025 at 08:15:41AM -0400, guoren@kernel.org wrote: > > > From: "Guo Ren (Alibaba DAMO Academy)" > > > > > > Since 2001, the CONFIG_64BIT kernel has been built with the LP64 ABI, > > > but this patchset allows the CONFIG_64BIT kernel to use an ILP32 ABI > > > > I'm thinking you're going to be finding a metric ton of assumptions > > about 'unsigned long' being 64bit when 64BIT=y throughout the kernel. > > > > I know of a couple of places where 64BIT will result in different math > > such that a 32bit 'unsigned long' will trivially overflow. > > > > Please, don't do this. This adds a significant maintenance burden on all > > of us. > > > > Fully agreed. I would go further and say I do not want this to go in. The open ended maintenance burden is not worth extending hardware life of a board with 16mb of ram (If I understand your 2023 LPC slides correctly). Thank you, Liam