Commit a68773bd authored by Nicolas Saenz Julienne's avatar Nicolas Saenz Julienne Committed by Will Deacon
Browse files

arm64: Select POSIX_CPU_TIMERS_TASK_WORK 

With 6caa5812 ("KVM: arm64: Use generic KVM xfer to guest work
function") all arm64 exit paths are properly equipped to handle the
POSIX timers' task work.

Deferring timer callbacks to thread context, not only limits the amount
of time spent in hard interrupt context, but is a safer
implementation[1], and will allow PREEMPT_RT setups to use KVM[2].

So let's enable POSIX_CPU_TIMERS_TASK_WORK on arm64.

[1] https://lore.kernel.org/all/20200716201923.228696399@linutronix.de/
[2] https://lore.kernel.org/linux-rt-users/87v92bdnlx.ffs@tglx/



Signed-off-by: default avatarNicolas Saenz Julienne <nsaenzju@redhat.com>
Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211018144713.873464-1-nsaenzju@redhat.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent d198c77b

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -192,6 +192,7 @@ config ARM64 
	select HAVE_PERF_REGS

	select HAVE_PERF_USER_STACK_DUMP

	select HAVE_REGS_AND_STACK_ACCESS_API

	select HAVE_POSIX_CPU_TIMERS_TASK_WORK

	select HAVE_FUNCTION_ARG_ACCESS_API

	select HAVE_FUTEX_CMPXCHG if FUTEX

	select MMU_GATHER_RCU_TABLE_FREE