linux-kernel - [PATCH V2] arm_pmu: Drop redundant armpmu->map_event() in armpmu_event

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Date:   Fri,  2 Dec 2022 07:26:11 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org, mark.rutland@....com
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH V2] arm_pmu: Drop redundant armpmu->map_event() in armpmu_event_init()

__hw_perf_event_init() already calls armpmu->map_event() callback, and also
returns its error code including -ENOENT, along with a debug callout. Hence
an additional armpmu->map_event() check for -ENOENT is redundant.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Acked-by: Mark Rutland <mark.rutland@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
Changes in V2:

- Rebased on arm64 (for-next/perf)

Changes in V1:

https://lore.kernel.org/all/20221130083350.264583-1-anshuman.khandual@arm.com/

 drivers/perf/arm_pmu.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/perf/arm_pmu.c b/drivers/perf/arm_pmu.c
index 3f07df5a7e95..ed89748b1612 100644
--- a/drivers/perf/arm_pmu.c
+++ b/drivers/perf/arm_pmu.c
@@ -514,9 +514,6 @@ static int armpmu_event_init(struct perf_event *event)
 	if (has_branch_stack(event))
 		return -EOPNOTSUPP;
 
-	if (armpmu->map_event(event) == -ENOENT)
-		return -ENOENT;
-
 	return __hw_perf_event_init(event);
 }
 
-- 
2.25.1