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tracing: Add ftrace_hash_key() helper function 

Replace the couple of use cases that has small logic to produce the ftrace
function key id with a helper function. No need for duplicate code.

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2017-02-01 12:19:33 -05:00
parent b9b0c831be
commit 2b0cce0e19
1 changed files with 11 additions and 10 deletions
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21
kernel/trace/ftrace.c
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@ -1185,6 +1185,15 @@ struct ftrace_page {
static struct ftrace_page *ftrace_pages_start;
static struct ftrace_page *ftrace_pages;
static __always_inline unsigned long
ftrace_hash_key(struct ftrace_hash *hash, unsigned long ip)
{
if (hash->size_bits > 0)
return hash_long(ip, hash->size_bits);
return 0;
}
struct ftrace_func_entry *
ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip)
{
@ -1195,11 +1204,7 @@ ftrace_lookup_ip(struct ftrace_hash *hash, unsigned long ip)
if (ftrace_hash_empty(hash))
return NULL;
if (hash->size_bits > 0)
key = hash_long(ip, hash->size_bits);
else
key = 0;
key = ftrace_hash_key(hash, ip);
hhd = &hash->buckets[key];
hlist_for_each_entry_rcu_notrace(entry, hhd, hlist) {
@ -1215,11 +1220,7 @@ static void __add_hash_entry(struct ftrace_hash *hash,
struct hlist_head *hhd;
unsigned long key;
if (hash->size_bits)
key = hash_long(entry->ip, hash->size_bits);
else
key = 0;
key = ftrace_hash_key(hash, entry->ip);
hhd = &hash->buckets[key];
hlist_add_head(&entry->hlist, hhd);
hash->count++;