linux-kernel - Re: [PATCH AUTOSEL 5.10 04/16] powerpc/hw_breakpoint: Avoid relying on caller synchronization

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Date:   Tue, 18 Oct 2022 11:35:09 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ian Rogers <irogers@...gle.com>, mpe@...erman.id.au,
        christophe.leroy@...roup.eu, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH AUTOSEL 5.10 04/16] powerpc/hw_breakpoint: Avoid relying
 on caller synchronization

Hi!

> From: Marco Elver <elver@...gle.com>
> 
> [ Upstream commit f95e5a3d59011eec1257d0e76de1e1f8969d426f ]
> 
> Internal data structures (cpu_bps, task_bps) of powerpc's hw_breakpoint
> implementation have relied on nr_bp_mutex serializing access to them.
> 
> Before overhauling synchronization of kernel/events/hw_breakpoint.c,
> introduce 2 spinlocks to synchronize cpu_bps and task_bps respectively,
> thus avoiding reliance on callers synchronizing powerpc's
> hw_breakpoint.

This is preparation, not a bugfix, not sure why it was picked for
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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