[PATCH 27/32] perf/core: add perf_event cgroup hooks for subsystem attributes

[David Carrillo-Cisneros <davidcc@google.com>]

Allow architectures to define additional attributes for the perf cgroup.

Reviewed-by: Stephane Eranian <eranian@google.com>
Signed-off-by: David Carrillo-Cisneros <davidcc@google.com>
---
 include/linux/perf_event.h | 4 ++++
 kernel/events/core.c       | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 054d7f4..b0f6088 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1285,4 +1285,8 @@ static struct device_attribute format_attr_##_name = __ATTR_RO(_name)
 # define perf_cgroup_arch_css_free(css) do { } while (0)
 #endif
 
+#ifndef PERF_CGROUP_ARCH_CGRP_SUBSYS_ATTS
+#define PERF_CGROUP_ARCH_CGRP_SUBSYS_ATTS
+#endif
+
 #endif /* _LINUX_PERF_EVENT_H */
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 28d1b51..804fdd1 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9903,5 +9903,7 @@ struct cgroup_subsys perf_event_cgrp_subsys = {
 	.css_released	= perf_cgroup_css_released,
 	.css_free	= perf_cgroup_css_free,
 	.attach		= perf_cgroup_attach,
+	/* Expand architecture specific attributes. */
+	PERF_CGROUP_ARCH_CGRP_SUBSYS_ATTS
 };
 #endif /* CONFIG_CGROUP_PERF */
-- 
2.8.0.rc3.226.g39d4020