linux-kernel - Re: [RFC PATCH V3 00/43] rv64ilp32_abi: Build CONFIG

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Message-ID: <20250325122640.GK36322@noisy.programming.kicks-ass.net>
Date: Tue, 25 Mar 2025 13:26:40 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: guoren@...nel.org
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Subject: Re: [RFC PATCH V3 00/43] rv64ilp32_abi: Build CONFIG_64BIT
 kernel-self with ILP32 ABI

On Tue, Mar 25, 2025 at 08:15:41AM -0400, guoren@...nel.org wrote:
> From: "Guo Ren (Alibaba DAMO Academy)" <guoren@...nel.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 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.