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

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Message-ID: <svu4xdeo7a7ve3vorvgbkjxzrqmqk5oztgtfpbg556wjw4x7vc@yg4esoipmt7g>
Date: Tue, 25 Mar 2025 15:23:39 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>, guoren@...nel.org, arnd@...db.de,
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Subject: Re: [RFC PATCH V3 00/43] rv64ilp32_abi: Build CONFIG_64BIT
 kernel-self with ILP32 ABI

* David Hildenbrand <david@...hat.com> [250325 14:52]:
> On 25.03.25 13:26, Peter Zijlstra wrote:
> > 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.
> > 
> 
> 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