Unverified Commit 0956be29 authored Jan 22, 2020 by Sergey Korolev Committed by Paul Burton Jan 22, 2020

MIPS: sync-r4k: do slave counter synchronization with disabled HW interrupts

synchronise_count_slave() called with an enabled in mips_clockevent_init()
timer interrupt which may decrease synchronization precision.

Signed-off-by: Sergey Korolev <s.korolev@ndmsystems.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-kernel@vger.kernel.org

parent c0e79fd8

arch/mips/kernel/sync-r4k.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -90,6 +90,9 @@ void synchronise_count_master(int cpu)
		void synchronise_count_slave(int cpu)
		{
		int i;
		unsigned long flags;

		local_irq_save(flags);

		/*
		* Not every cpu is online at the time this gets called,
		@@ -113,5 +116,7 @@ void synchronise_count_slave(int cpu)
		}
		/* Arrange for an interrupt in a short while */
		write_c0_compare(read_c0_count() + COUNTON);

		local_irq_restore(flags);
		}
		#undef NR_LOOPS

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