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| author |   Sergey Korolev <s.korolev@ndmsystems.com> | 2020-01-22 15:39:08 +0300 |
|---|---|---|
| committer |   Paul Burton <paulburton@kernel.org> | 2020-01-22 10:16:18 -0800 |
| commit | 0956be29a96c1ce879b6a8fad1cc61f53c140ec8 (patch) | |
| tree | dca57a17008ca000af1d3f6f9fd70e507c0d413a /arch/mips | |
| parent | MIPS: SGI-IP30: Check for valid pointer before using it (diff) | |
| download | linux-dev-0956be29a96c1ce879b6a8fad1cc61f53c140ec8.tar.xz linux-dev-0956be29a96c1ce879b6a8fad1cc61f53c140ec8.zip | |
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
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/kernel/sync-r4k.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/mips/kernel/sync-r4k.c b/arch/mips/kernel/sync-r4k.c index f2973ce87f53..abdd7aaa3311 100644 --- a/arch/mips/kernel/sync-r4k.c +++ b/arch/mips/kernel/sync-r4k.c @@ -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 |