linux-kernel - [RFC][PATCH v2 04/11] perf: core, use new api to lookup pmu and init event

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Message-Id: <1274233556.3036.82.camel@localhost>
Date:	Wed, 19 May 2010 01:45:56 +0000
From:	Lin Ming <ming.m.lin@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"eranian@...il.com" <eranian@...il.com>,
	"Gary.Mohr@...l.com" <Gary.Mohr@...l.com>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <carll@...ibm.com>,
	"greg@...ah.com" <greg@...ah.com>,
	Kay Sievers <kay.sievers@...y.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [RFC][PATCH v2 04/11] perf: core, use new api to lookup pmu and
 init event

Remove the weak function hw_perf_event_init
    
Signed-off-by: Lin Ming <ming.m.lin@...el.com>
---
 include/linux/perf_event.h |    2 --
 kernel/perf_event.c        |   12 ++++--------
 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 40809f5..ad2aea3 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -825,8 +825,6 @@ struct perf_output_handle {
  */
 extern int perf_max_events;
 
-extern struct pmu *hw_perf_event_init(struct perf_event *event);
-
 extern void perf_event_task_sched_in(struct task_struct *task);
 extern void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
 extern void perf_event_task_tick(struct task_struct *task);
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 31b032b..17eff7b 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -81,11 +81,6 @@ static DEFINE_SPINLOCK(perf_resource_lock);
 /*
  * Architecture provided APIs - weak aliases:
  */
-extern __weak struct pmu *hw_perf_event_init(struct perf_event *event)
-{
-	return NULL;
-}
-
 void __weak hw_perf_disable(void)		{ barrier(); }
 void __weak hw_perf_enable(void)		{ barrier(); }
 
@@ -4727,7 +4722,7 @@ perf_event_alloc(struct perf_event_attr *attr,
 	struct pmu *pmu;
 	struct perf_event *event;
 	struct hw_perf_event *hwc;
-	long err;
+	long err = 0;
 
 	event = kzalloc(sizeof(*event), gfpflags);
 	if (!event)
@@ -4792,7 +4787,9 @@ perf_event_alloc(struct perf_event_attr *attr,
 	case PERF_TYPE_RAW:
 	case PERF_TYPE_HARDWARE:
 	case PERF_TYPE_HW_CACHE:
-		pmu = hw_perf_event_init(event);
+		pmu = perf_event_lookup_pmu(event);
+		if (pmu && pmu->init_event)
+			err = pmu->init_event(event);
 		break;
 
 	case PERF_TYPE_SOFTWARE:
@@ -4812,7 +4809,6 @@ perf_event_alloc(struct perf_event_attr *attr,
 		break;
 	}
 done:
-	err = 0;
 	if (!pmu)
 		err = -EINVAL;
 	else if (IS_ERR(pmu))




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