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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
This commit is contained in:
Sergey Korolev 2020-01-22 15:39:08 +03:00 committed by Paul Burton
parent c0e79fd897
commit 0956be29a9
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GPG Key ID: 3EA79FACB57500DD
1 changed files with 5 additions and 0 deletions
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5
arch/mips/kernel/sync-r4k.c
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@ -90,6 +90,9 @@ void synchronise_count_master(int cpu)
void synchronise_count_slave(int cpu) void synchronise_count_slave(int cpu)
{ {
int i; int i;
unsigned long flags;
local_irq_save(flags);
/* /*
* Not every cpu is online at the time this gets called, * 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 */ /* Arrange for an interrupt in a short while */
write_c0_compare(read_c0_count() + COUNTON); write_c0_compare(read_c0_count() + COUNTON);
local_irq_restore(flags);
} }
#undef NR_LOOPS #undef NR_LOOPS