linux-kernel - [PATCH] Revert "perf: Add a counter for number of user access events in context"

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Message-ID: <20240805231031.1760371-1-song@kernel.org>
Date: Mon,  5 Aug 2024 16:10:31 -0700
From: Song Liu <song@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Song Liu <song@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH] Revert "perf: Add a counter for number of user access events in context"

This reverts commit 82ff0c022d19c2ad69a472692bb7ee01ac07a40b.

perf_event->nr_user is not used any more. Remove it.

Cc: Mark Rutland <mark.rutland@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Rob Herring <robh@...nel.org>
Cc: Will Deacon <will@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Signed-off-by: Song Liu <song@...nel.org>
---
 include/linux/perf_event.h | 1 -
 kernel/events/core.c       | 4 ----
 2 files changed, 5 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 1a8942277dda..509ae4770bbe 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -931,7 +931,6 @@ struct perf_event_context {
 	struct list_head		event_list;
 
 	int				nr_events;
-	int				nr_user;
 	int				is_active;
 
 	int				nr_task_data;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index aa3450bdc227..6f44755ae907 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1793,8 +1793,6 @@ list_add_event(struct perf_event *event, struct perf_event_context *ctx)
 
 	list_add_rcu(&event->event_entry, &ctx->event_list);
 	ctx->nr_events++;
-	if (event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT)
-		ctx->nr_user++;
 	if (event->attr.inherit_stat)
 		ctx->nr_stat++;
 
@@ -2017,8 +2015,6 @@ list_del_event(struct perf_event *event, struct perf_event_context *ctx)
 	event->attach_state &= ~PERF_ATTACH_CONTEXT;
 
 	ctx->nr_events--;
-	if (event->hw.flags & PERF_EVENT_FLAG_USER_READ_CNT)
-		ctx->nr_user--;
 	if (event->attr.inherit_stat)
 		ctx->nr_stat--;
 
-- 
2.43.5