linux-kernel - Re: [PATCH v2 1/1] hung_task: fix warnings caused by unaligned lock pointers

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Message-ID: <b94030984037e54a61f762f9aa62776ecd8082af.camel@physik.fu-berlin.de>
Date: Wed, 10 Sep 2025 09:37:52 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>, Lance Yang	
 <lance.yang@...ux.dev>, akpm@...ux-foundation.org, amaindex@...look.com, 
	anna.schumaker@...cle.com, boqun.feng@...il.com, fthain@...ux-m68k.org, 
	ioworker0@...il.com, joel.granados@...nel.org, jstultz@...gle.com, 
	leonylgao@...cent.com, linux-kernel@...r.kernel.org, 
	linux-m68k@...ts.linux-m68k.org, longman@...hat.com, mhiramat@...nel.org, 
	mingo@...hat.com, mingzhe.yang@...com, oak@...sinkinet.fi,
 peterz@...radead.org, 	rostedt@...dmis.org, senozhatsky@...omium.org,
 tfiga@...omium.org, will@...nel.org, 	stable@...r.kernel.org
Subject: Re: [PATCH v2 1/1] hung_task: fix warnings caused by unaligned lock
 pointers

On Wed, 2025-09-10 at 09:34 +0200, Geert Uytterhoeven wrote:
> > > Isn't m68k the only architecture that's weird like this?
> > 
> > Yes, and it does this on Linux only. I have been trying to change it upstream
> > though as the official SysV ELF ABI for m68k requires a 4-byte natural alignment [1].
> 
> M68k does this on various OSes and ABIs that predate or are not
> explicitly compatible with the SysV ELF ABI.

I know. I was talking in the context of SysV ELF systems.

> Other architectures like CRIS (1-byte alignment!) are no longer supported
> by Linux.

Yes, that's why we should take care of the alignment ;-).

> FWIW, doubles (and doublewords) are not naturally aligned in the
> SysV ELF ABI for i386, while doubles (no mention of doublewords)
> are naturally aligned in the SysV ELF ABI for m68k.

I wouldn't consider i386 a role model for us ;-).

Adrian

-- 
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