linux-kernel - [RFC PATCH 06/15] s390/perf: Remove driver-specific throttle support

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Message-Id: <20250506164740.1317237-7-kan.liang@linux.intel.com>
Date: Tue,  6 May 2025 09:47:31 -0700
From: kan.liang@...ux.intel.com
To: peterz@...radead.org,
	mingo@...hat.com,
	namhyung@...nel.org,
	irogers@...gle.com,
	mark.rutland@....com,
	linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Cc: eranian@...gle.com,
	ctshao@...gle.com,
	tmricht@...ux.ibm.com,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [RFC PATCH 06/15] s390/perf: Remove driver-specific throttle support

From: Kan Liang <kan.liang@...ux.intel.com>

The throttle support has been added in the generic code. Remove
the driver-specific throttle support.

Besides the throttle, perf_event_overflow may return true because of
event_limit. It already does an inatomic event disable. The pmu->stop
is not required either.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Cc: Thomas Richter <tmricht@...ux.ibm.com>
---
 arch/s390/kernel/perf_cpum_cf.c | 2 --
 arch/s390/kernel/perf_cpum_sf.c | 5 +----
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index e657fad7e376..6a262e198e35 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -980,8 +980,6 @@ static int cfdiag_push_sample(struct perf_event *event,
 	}
 
 	overflow = perf_event_overflow(event, &data, &regs);
-	if (overflow)
-		event->pmu->stop(event, 0);
 
 	perf_event_update_userpage(event);
 	return overflow;
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index ad22799d8a7d..91469401f2c9 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -1072,10 +1072,7 @@ static int perf_push_sample(struct perf_event *event,
 	overflow = 0;
 	if (perf_event_exclude(event, &regs, sde_regs))
 		goto out;
-	if (perf_event_overflow(event, &data, &regs)) {
-		overflow = 1;
-		event->pmu->stop(event, 0);
-	}
+	overflow = perf_event_overflow(event, &data, &regs);
 	perf_event_update_userpage(event);
 out:
 	return overflow;
-- 
2.38.1