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ftrace: Separate out the copying of a ftrace_hash from __ftrace_hash_move() 

Most of the functionality of __ftrace_hash_move() can be reused, but not all
of it. That is, __ftrace_hash_move() is used to simply make a new hash from
an existing one, using the same size as the original. Creating a dup_hash(),
where we can specify a new size will be useful when we want to create a hash
with a default size, or simply copy the old one.

Signed-off-by: Steven Rostedt (VMWare) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2019-11-08 12:25:46 -05:00
parent 8c666d2ab5
commit 714641c367
1 changed files with 17 additions and 12 deletions
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29
kernel/trace/ftrace.c
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@ -1372,23 +1372,15 @@ ftrace_hash_rec_enable_modify(struct ftrace_ops *ops, int filter_hash);
static int ftrace_hash_ipmodify_update(struct ftrace_ops *ops,
struct ftrace_hash *new_hash);
static struct ftrace_hash *
__ftrace_hash_move(struct ftrace_hash *src)
static struct ftrace_hash *dup_hash(struct ftrace_hash *src, int size)
{
struct ftrace_func_entry *entry;
struct hlist_node *tn;
struct hlist_head *hhd;
struct ftrace_hash *new_hash;
int size = src->count;
struct hlist_head *hhd;
struct hlist_node *tn;
int bits = 0;
int i;
/*
* If the new source is empty, just return the empty_hash.
*/
if (ftrace_hash_empty(src))
return EMPTY_HASH;
/*
* Make the hash size about 1/2 the # found
*/
@ -1413,10 +1405,23 @@ __ftrace_hash_move(struct ftrace_hash *src)
__add_hash_entry(new_hash, entry);
}
}
return new_hash;
}
static struct ftrace_hash *
__ftrace_hash_move(struct ftrace_hash *src)
{
int size = src->count;
/*
* If the new source is empty, just return the empty_hash.
*/
if (ftrace_hash_empty(src))
return EMPTY_HASH;
return dup_hash(src, size);
}
static int
ftrace_hash_move(struct ftrace_ops *ops, int enable,
struct ftrace_hash **dst, struct ftrace_hash *src)