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tracing: Annotate ftrace_graph_notrace_hash pointer with __rcu 

Fix following instances of sparse error
kernel/trace/ftrace.c:5667:29: error: incompatible types in comparison
kernel/trace/ftrace.c:5813:21: error: incompatible types in comparison
kernel/trace/ftrace.c:5868:36: error: incompatible types in comparison
kernel/trace/ftrace.c:5870:25: error: incompatible types in comparison

Use rcu_dereference_protected to dereference the newly annotated pointer.

Link: http://lkml.kernel.org/r/20200205055701.30195-1-frextrite@gmail.com

Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Amol Grover 2020-02-05 11:27:02 +05:30 committed by Steven Rostedt (VMware)
parent 24a9729f83
commit fd0e6852c4
2 changed files with 7 additions and 3 deletions
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2
kernel/trace/ftrace.c
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@ -5592,7 +5592,7 @@ static const struct file_operations ftrace_notrace_fops = {
static DEFINE_MUTEX(graph_lock);
struct ftrace_hash __rcu *ftrace_graph_hash = EMPTY_HASH;
struct ftrace_hash *ftrace_graph_notrace_hash = EMPTY_HASH;
struct ftrace_hash __rcu *ftrace_graph_notrace_hash = EMPTY_HASH;
enum graph_filter_type {
GRAPH_FILTER_NOTRACE = 0,

8
kernel/trace/trace.h
View File

@ -965,7 +965,7 @@ extern void __trace_graph_return(struct trace_array *tr,
#ifdef CONFIG_DYNAMIC_FTRACE
extern struct ftrace_hash __rcu *ftrace_graph_hash;
extern struct ftrace_hash *ftrace_graph_notrace_hash;
extern struct ftrace_hash __rcu *ftrace_graph_notrace_hash;
static inline int ftrace_graph_addr(struct ftrace_graph_ent *trace)
{
@ -1018,10 +1018,14 @@ static inline void ftrace_graph_addr_finish(struct ftrace_graph_ret *trace)
static inline int ftrace_graph_notrace_addr(unsigned long addr)
{
int ret = 0;
struct ftrace_hash *notrace_hash;
preempt_disable_notrace();
if (ftrace_lookup_ip(ftrace_graph_notrace_hash, addr))
notrace_hash = rcu_dereference_protected(ftrace_graph_notrace_hash,
!preemptible());
if (ftrace_lookup_ip(notrace_hash, addr))
ret = 1;
preempt_enable_notrace();