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

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Message-ID: <875xdqsssz.fsf@igel.home>
Date: Wed, 10 Sep 2025 08:52:28 +0200
From: Andreas Schwab <schwab@...ux-m68k.org>
To: Finn Thain <fthain@...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,  geert@...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 Sep 10 2025, Finn Thain wrote:

> Linux is probably the only non-trivial program that could be feasibly 
> rebuilt with -malign-int without ill effect (i.e. without breaking 
> userland)

No, you can't.  It would change the layout of basic user-level
structures, breaking the syscall ABI.

-- 
Andreas Schwab, schwab@...ux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."