From 714641c3670cdc75371a7ff5bdfd5e9a170c7ffd Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" Date: Fri, 8 Nov 2019 12:25:46 -0500 Subject: [PATCH] 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) --- kernel/trace/ftrace.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 89e9128652ef..76e5de8c7822 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1372,24 +1372,16 @@ 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 */ for (size /= 2; size; size >>= 1) @@ -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) -- 2.11.0