[PATCH 1/2] events: callchain: Annotate RCU pointer with __rcu

[Amol Grover]

Fixes following instances of sparse error
error: incompatible types in comparison expression
(different address spaces)
kernel/events/callchain.c:66:9: error: incompatible types in comparison
kernel/events/callchain.c:96:9: error: incompatible types in comparison
kernel/events/callchain.c:161:19: error: incompatible types in comparison

This introduces the following warning
kernel/events/callchain.c:65:17: warning: incorrect type in assignment

Signed-off-by: Amol Grover <frextrite@xxxxxxxxx>
---
 kernel/events/callchain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c
index c2b41a263166..f91e1f41d25d 100644
--- a/kernel/events/callchain.c
+++ b/kernel/events/callchain.c
@@ -32,7 +32,7 @@ static inline size_t perf_callchain_entry__sizeof(void)
 static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]);
 static atomic_t nr_callchain_events;
 static DEFINE_MUTEX(callchain_mutex);
-static struct callchain_cpus_entries *callchain_cpus_entries;
+static struct callchain_cpus_entries __rcu *callchain_cpus_entries;
 
 
 __weak void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
-- 
2.24.1