linux-kernel - [tip: perf/core] perf/x86: Remove task_ctx

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Date:   Wed, 08 Jul 2020 09:51:45 -0000
From:   "tip-bot2 for Kan Liang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kan Liang <kan.liang@...ux.intel.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/core] perf/x86: Remove task_ctx_size

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     5a09928d339f3cf0973991ddc3a2798825c84c99
Gitweb:        https://git.kernel.org/tip/5a09928d339f3cf0973991ddc3a2798825c84c99
Author:        Kan Liang <kan.liang@...ux.intel.com>
AuthorDate:    Fri, 03 Jul 2020 05:49:24 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 08 Jul 2020 11:38:55 +02:00

perf/x86: Remove task_ctx_size

A new kmem_cache method has replaced the kzalloc() to allocate the PMU
specific data. The task_ctx_size is not required anymore.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/1593780569-62993-19-git-send-email-kan.liang@linux.intel.com
---
 arch/x86/events/core.c      | 1 -
 arch/x86/events/intel/lbr.c | 1 -
 include/linux/perf_event.h  | 4 ----
 kernel/events/core.c        | 4 +---
 4 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index d740c86..6b1228a 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2371,7 +2371,6 @@ static struct pmu pmu = {
 
 	.event_idx		= x86_pmu_event_idx,
 	.sched_task		= x86_pmu_sched_task,
-	.task_ctx_size          = sizeof(struct x86_perf_task_context),
 	.swap_task_ctx		= x86_pmu_swap_task_ctx,
 	.check_period		= x86_pmu_check_period,
 
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index e784c1d..3ad5289 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1672,7 +1672,6 @@ void __init intel_pmu_arch_lbr_init(void)
 
 	size = sizeof(struct x86_perf_task_context_arch_lbr) +
 	       lbr_nr * sizeof(struct lbr_entry);
-	x86_get_pmu()->task_ctx_size = size;
 	x86_get_pmu()->task_ctx_cache = create_lbr_kmem_cache(size, 0);
 
 	x86_pmu.lbr_from = MSR_ARCH_LBR_FROM_0;
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 09915ae..3b22db0 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -419,10 +419,6 @@ struct pmu {
 	 */
 	void (*sched_task)		(struct perf_event_context *ctx,
 					bool sched_in);
-	/*
-	 * PMU specific data size
-	 */
-	size_t				task_ctx_size;
 
 	/*
 	 * Kmem cache of PMU specific data
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 30d9b31..7c436d7 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1243,15 +1243,13 @@ static void *alloc_task_ctx_data(struct pmu *pmu)
 	if (pmu->task_ctx_cache)
 		return kmem_cache_zalloc(pmu->task_ctx_cache, GFP_KERNEL);
 
-	return kzalloc(pmu->task_ctx_size, GFP_KERNEL);
+	return NULL;
 }
 
 static void free_task_ctx_data(struct pmu *pmu, void *task_ctx_data)
 {
 	if (pmu->task_ctx_cache && task_ctx_data)
 		kmem_cache_free(pmu->task_ctx_cache, task_ctx_data);
-	else
-		kfree(task_ctx_data);
 }
 
 static void free_ctx(struct rcu_head *head)