linux-kernel - [PATCH] alpha: Fix HW performance counters to be stopped properly.

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Date:	Sun, 12 Sep 2010 17:37:24 +1200
From:	Michael Cree <mcree@...on.net.nz>
To:	peterz@...radead.org
Cc:	Michael Cree <mcree@...on.net.nz>, mingo@...hat.com,
	dengcheng.zhu@...il.com, yanmin_zhang@...ux.intel.com,
	gorcunov@...il.com, fweisbec@...il.com, robert.richter@....com,
	ming.m.lin@...el.com, tglx@...utronix.de, hpa@...or.com,
	paulus@...ba.org, linux-kernel@...r.kernel.org,
	eranian@...glemail.com, will.deacon@....com, lethal@...ux-sh.org,
	davem@...emloft.net, mingo@...e.hu, linux-alpha@...r.kernel.org
Subject: [PATCH] alpha:  Fix HW performance counters to be stopped properly.

Also fix a few compile errors due to undefined and duplicated
variables.

Signed-off-by: Michael Cree <mcree@...on.net.nz>
---
 arch/alpha/kernel/perf_event.c |   17 +++++++++--------
 1 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c
index a25fe9e..41f204f 100644
--- a/arch/alpha/kernel/perf_event.c
+++ b/arch/alpha/kernel/perf_event.c
@@ -422,9 +422,10 @@ static void maybe_change_configuration(struct cpu_hw_events *cpuc)
 static int alpha_pmu_add(struct perf_event *event, int flags)
 {
 	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+	struct hw_perf_event *hwc = &event->hw;
 	int n0;
 	int ret;
-	unsigned long flags;
+	unsigned long irq_flags;
 
 	/*
 	 * The Sparc code has the IRQ disable first followed by the perf
@@ -435,7 +436,7 @@ static int alpha_pmu_add(struct perf_event *event, int flags)
 	 * final PMI to occur before we disable interrupts.
 	 */
 	perf_pmu_disable(event->pmu);
-	local_irq_save(flags);
+	local_irq_save(irq_flags);
 
 	/* Default to error to be returned */
 	ret = -EAGAIN;
@@ -458,7 +459,7 @@ static int alpha_pmu_add(struct perf_event *event, int flags)
 	if (!(flags & PERF_EF_START))
 		hwc->state |= PERF_HES_STOPPED;
 
-	local_irq_restore(flags);
+	local_irq_restore(irq_flags);
 	perf_pmu_enable(event->pmu);
 
 	return ret;
@@ -474,11 +475,11 @@ static void alpha_pmu_del(struct perf_event *event, int flags)
 {
 	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
 	struct hw_perf_event *hwc = &event->hw;
-	unsigned long flags;
+	unsigned long irq_flags;
 	int j;
 
 	perf_pmu_disable(event->pmu);
-	local_irq_save(flags);
+	local_irq_save(irq_flags);
 
 	for (j = 0; j < cpuc->n_events; j++) {
 		if (event == cpuc->event[j]) {
@@ -504,7 +505,7 @@ static void alpha_pmu_del(struct perf_event *event, int flags)
 		}
 	}
 
-	local_irq_restore(flags);
+	local_irq_restore(irq_flags);
 	perf_pmu_enable(event->pmu);
 }
 
@@ -523,7 +524,7 @@ static void alpha_pmu_stop(struct perf_event *event, int flags)
 	struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
 
 	if (!(hwc->state & PERF_HES_STOPPED)) {
-		cpuc->idx_mask &= !(1UL<<hwc->idx);
+		cpuc->idx_mask &= ~(1UL<<hwc->idx);
 		hwc->state |= PERF_HES_STOPPED;
 	}
 
@@ -533,7 +534,7 @@ static void alpha_pmu_stop(struct perf_event *event, int flags)
 	}
 
 	if (cpuc->enabled)
-		wrperfmon(PERFMON_CMD_ENABLE, (1UL<<hwc->idx));
+		wrperfmon(PERFMON_CMD_DISABLE, (1UL<<hwc->idx));
 }
 
 
-- 
1.7.1

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