linux-kernel - Re: [PATCH] powerpc: preempt: Don't touch the idle task's preempt

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Message-Id: <162575242118.20406.3966849452752169600.b4-ty@ellerman.id.au>
Date:   Thu, 08 Jul 2021 23:53:41 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Valentin Schneider <valentin.schneider@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Paul Mackerras <paulus@...ba.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Ingo Molnar <mingo@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Bharata B Rao <bharata@...ux.ibm.com>
Subject: Re: [PATCH] powerpc: preempt: Don't touch the idle task's preempt_count during hotplug

On Wed, 7 Jul 2021 19:38:31 +0100, Valentin Schneider wrote:
> Powerpc currently resets a CPU's idle task preempt_count to 0 before said
> task starts executing the secondary startup routine (and becomes an idle
> task proper).
> 
> This conflicts with commit
> 
>   f1a0a376ca0c ("sched/core: Initialize the idle task with preemption disabled")
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc: preempt: Don't touch the idle task's preempt_count during hotplug
      https://git.kernel.org/powerpc/c/2c669ef6979c370f98d4b876e54f19613c81e075

cheers