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

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Message-ID: <0e1d8823-620f-420c-86a5-35495ccbd10f@redhat.com>
Date: Tue, 25 Mar 2025 19:51:47 +0100
From: David Hildenbrand <david@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>, 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 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.

-- 
Cheers,

David / dhildenb