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Tue, 25 Mar 2025 11:51:50 -0700 (PDT) Received: from [172.20.3.205] ([99.209.85.25]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6eb3efc5952sm58924306d6.83.2025.03.25.11.51.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Mar 2025 11:51:50 -0700 (PDT) Message-ID: <0e1d8823-620f-420c-86a5-35495ccbd10f@redhat.com> Date: Tue, 25 Mar 2025 19:51:47 +0100 Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH V3 00/43] rv64ilp32_abi: Build CONFIG_64BIT kernel-self with ILP32 ABI To: Peter Zijlstra , guoren@kernel.org Cc: 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> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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. -- Cheers, David / dhildenb