linux-kernel - Re: [PATCH 5.10 091/132] Documentation/locking/locktypes: Update migrate

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Date:   Wed, 29 Dec 2021 12:12:11 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH 5.10 091/132] Documentation/locking/locktypes: Update
 migrate_disable() bits.

Hi!

> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> 
> commit 6a631c0432dcccbcf45839016a07c015e335e9ae upstream.
> 
> The initial implementation of migrate_disable() for mainline was a
> wrapper around preempt_disable(). RT kernels substituted this with
> a real migrate disable implementation.
> 
> Later on mainline gained true migrate disable support, but the
> documentation was not updated.
> 
> Update the documentation, remove the claims about migrate_disable()
> mapping to preempt_disable() on non-PREEMPT_RT kernels.

> Fixes: 74d862b682f51 ("sched: Make migrate_disable/enable()
>  independent of RT")

AFAICT this commit is not present in 5.10... so this breaks
documentation, rather than improving it. (And should be reverted from
5.10).

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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