Re: [RFC PATCH V3 00/43] rv64ilp32_abi: Build CONFIG_64BIT kernel-self with ILP32 ABI
From: David Hildenbrand <hidden>
Date: 2025-03-25 18:51:55
Also in:
bpf, kvm, kvm-riscv, linux-arch, linux-btrfs, linux-crypto, linux-fsdevel, linux-media, linux-mm, linux-nfs, linux-perf-users, linux-riscv, linux-sctp, linux-serial, linux-trace-kernel, linux-usb, lkml, netdev, netfilter-devel
On 25.03.25 13:26, Peter Zijlstra wrote:
On Tue, Mar 25, 2025 at 08:15:41AM -0400, guoren@kernel.org wrote:quoted
From: "Guo Ren (Alibaba DAMO Academy)" <guoren@kernel.org> 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 ABII'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