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

Hi!

From: Marco Elver <elver@google.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
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DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
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