linux-kernel - Re: [patch 1/4] sched/mmcid: Prevent live lock on task to CPU mode transition

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87wm0zjcsa.ffs@tglx>
Date: Fri, 30 Jan 2026 17:17:09 +0100
From: Thomas Gleixner <tglx@...nel.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, LKML
 <linux-kernel@...r.kernel.org>
Cc: Ihor Solodrai <ihor.solodrai@...ux.dev>, Shrikanth Hegde
 <sshegde@...ux.ibm.com>, Peter Zijlstra <peterz@...radead.org>, Michael
 Jeanson <mjeanson@...icios.com>
Subject: Re: [patch 1/4] sched/mmcid: Prevent live lock on task to CPU mode
 transition

On Fri, Jan 30 2026 at 10:24, Mathieu Desnoyers wrote:
> On 2026-01-29 16:20, Thomas Gleixner wrote:
>>   	if (percpu) {
>>   		mm_cid_fixup_tasks_to_cpus();
>> +		/* Clear the transition bit */
>> +		WRITE_ONCE(mm->mm_cid.transit, 0);
>
> You should move this WRITE_ONCE at the end of
> mm_cid_fixup_tasks_to_cpus() to keep the same pattern as for
> mm_cid_fixup_cpus_to_tasks().

I fixed that up in the wrong patch. Will fold it back into that one.