Re: [PATCH] atomic: Specify natural alignment for atomic_t

[Lance Yang <lance.yang@linux.dev>]

On 2025/8/27 16:00, Finn Thain wrote:
> 
> On Mon, 25 Aug 2025, Lance Yang wrote:
> 
>>>
>>> More problematic is that, IIRC, m68k kmalloc() allocates 16bit aligned
>>> memory. This has broken other things in the past. I doubt that
>>> increasing the alignment to 32bits would make much difference to the
>>> kernel memory footprint.
>>
>> @Finn Given this new information, how about we just apply the runtime
>> check fix for now?
> 
> New information? No, that's just hear-say.

Emm... I jumped the gun there ;p

> 
>> Since we plan to remove the entire pointer-encoding scheme later anyway,
>> a minimal and targeted change could be the logical choice. It's easy and
>> safe to backport, and it cleanly stops the warnings from all sources
>> without introducing new risks - exactly what we need for stable kernels.
>>
> 
> Well, that's up to you, of course. If you want my comment, I'd only ask
> whether or not the bug is theoretical (outside of m68k).

Well, let's apply both this fix and the runtime check fix[1] as Masami
suggested ;)

[1] https://lore.kernel.org/lkml/20250823050036.7748-1-lance.yang@linux.dev/