linux-kernel - Re: [RFC] sched,livepatch: call klp_try_switch_task in __cond

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Date:   Mon, 9 May 2022 09:04:37 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <song@...nel.org>
Cc:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        mingo@...hat.com, vincent.guittot@...aro.org, jpoimboe@...hat.com,
        joe.lawrence@...hat.com, kernel-team@...com
Subject: Re: [RFC] sched,livepatch: call klp_try_switch_task in __cond_resched

On Sat, May 07, 2022 at 10:46:28AM -0700, Song Liu wrote:
> Busy kernel threads may block the transition of livepatch. Call
> klp_try_switch_task from __cond_resched to make the transition easier.

What will a PREEMPT=y kernel do? How is it not a problem there, and if
it is, this will not help that.

That is; I don't think this can be right.