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MIPS: OProfile: Allow sharing IRQ with timer

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When requesting the performance counter overflow interrupt, pass flags
which are compatible with the cevt-r4k driver, in particular
IRQF_SHARED so that the two handlers can share the same IRQ. This is
possible since release 2 of the architecture where there are separate
pending interrupt bits for the timer interrupt and the performance
counter interrupt.

This will be necessary since the FDC interrupt can also be arbitrarily
routed to a CPU interrupt, possibly sharing with the timer, the
performance counters, or both, and it isn't scalable to have all the
handlers able to call other handlers that may be on the same IRQ line.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Robert Richter <rric@kernel.org>
Cc: linux-mips@linux-mips.org
Cc: oprofile-list@lists.sf.net
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9130/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2015-01-27 21:45:54 +00:00 committed by Ralf Baechle
parent a1ec0e1883
commit 369a93bbc7
1 changed files with 4 additions and 1 deletions
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5
arch/mips/oprofile/op_model_mipsxx.c
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@ -442,7 +442,10 @@ static int __init mipsxx_init(void)
if (perfcount_irq >= 0)
return request_irq(perfcount_irq, mipsxx_perfcount_int,
0, "Perfcounter", save_perf_irq);
IRQF_PERCPU | IRQF_NOBALANCING |
IRQF_NO_THREAD | IRQF_NO_SUSPEND |
IRQF_SHARED,
"Perfcounter", save_perf_irq);
return 0;
}