linux-kernel - [PATCH] perf: cleanup initialization of attr->size

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Date:	Thu, 9 Feb 2012 16:12:38 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...hat.com, peterz@...radead.org, mingo@...e.hu
Subject: [PATCH] perf: cleanup initialization of attr->size


The perf_event_attr size needs to be initialized
in all cases because it captures the ABI version.

This patch moves the initialization of the field
from the perf_event_open() syscall stub to its proper
location in the event_attr_init().

Signed-off-by: Stephane Eranian <eranian@...gle.com>
---

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 92af168..06f2d1a 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -167,7 +167,6 @@ sys_perf_event_open(struct perf_event_attr *attr,
 		      pid_t pid, int cpu, int group_fd,
 		      unsigned long flags)
 {
-	attr->size = sizeof(*attr);
 	return syscall(__NR_perf_event_open, attr, pid, cpu,
 		       group_fd, flags);
 }
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 8131410..c1017b3 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -14,6 +14,8 @@ void event_attr_init(struct perf_event_attr *attr)
 		attr->exclude_host  = 1;
 	if (!perf_guest)
 		attr->exclude_guest = 1;
+	/* to capture ABI version */
+	attr->size = sizeof(*attr);
 }
 
 int mkdir_p(char *path, mode_t mode)
--
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