arm64: hw_breakpoint: convert CPU hotplug notifier to new infrastructure

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The arm64 hw_breakpoint implementation uses a CPU hotplug notifier to
reset the {break,watch}point registers when CPUs come online.

This patch converts the code to the new hotplug mechanism, whilst moving
the invocation earlier to remove the need to disable IRQs explicitly in
the driver (which could cause havok if we trip a watchpoint in an IRQ
handler whilst restoring the debug register state).

Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Will Deacon 2016-08-15 18:55:11 +01:00

parent a842789837

commit d7a83d127a

3 changed files with 23 additions and 36 deletions

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48

arch/arm64/kernel/hw_breakpoint.c

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10

arch/arm64/kernel/suspend.c

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1

include/linux/cpuhotplug.h

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