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ftrace: Expose ftrace_hash_empty and ftrace_lookup_ip 

It will be used when checking graph filter hashes later.

Link: http://lkml.kernel.org/r/20170120024447.26097-2-namhyung@kernel.org

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
[ Moved ftrace_hash dec and functions outside of FUNCTION_GRAPH define ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Namhyung Kim 2017-01-20 11:44:46 +09:00 committed by Steven Rostedt (VMware)
parent 3e278c0dc1
commit 4046bf023b
2 changed files with 16 additions and 14 deletions
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14
kernel/trace/ftrace.c
View File

@ -1110,13 +1110,6 @@ struct ftrace_func_entry {
unsigned long ip;
};
struct ftrace_hash {
unsigned long size_bits;
struct hlist_head *buckets;
unsigned long count;
struct rcu_head rcu;
};
/*
* We make these constant because no one should touch them,
* but they are used as the default "empty hash", to avoid allocating
@ -1192,12 +1185,7 @@ struct ftrace_page {
static struct ftrace_page *ftrace_pages_start;
static struct ftrace_page *ftrace_pages;
static bool __always_inline ftrace_hash_empty(struct ftrace_hash *hash)
{
return !hash || !hash->count;
}
static struct ftrace_func_entry *
struct ftrace_func_entry *
ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip)
{
unsigned long key;

16
kernel/trace/trace.h
View File

@ -753,6 +753,21 @@ enum print_line_t print_trace_line(struct trace_iterator *iter);
extern char trace_find_mark(unsigned long long duration);
struct ftrace_hash {
unsigned long size_bits;
struct hlist_head *buckets;
unsigned long count;
struct rcu_head rcu;
};
struct ftrace_func_entry *
ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip);
static bool __always_inline ftrace_hash_empty(struct ftrace_hash *hash)
{
return !hash || !hash->count;
}
/* Standard output formatting function used for function return traces */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
@ -787,7 +802,6 @@ extern void __trace_graph_return(struct trace_array *tr,
struct ftrace_graph_ret *trace,
unsigned long flags, int pc);
#ifdef CONFIG_DYNAMIC_FTRACE
/* TODO: make this variable */
#define FTRACE_GRAPH_MAX_FUNCS 32