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ftrace: Factor out __ftrace_hash_move()

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The __ftrace_hash_move() is to allocates properly-sized hash and move
entries in the src ftrace_hash.  It will be used to set function graph
filters which has nothing to do with the dyn_ftrace records.

Link: http://lkml.kernel.org/r/20170120024447.26097-1-namhyung@kernel.org

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Namhyung Kim 2017-01-20 11:44:45 +09:00 committed by Steven Rostedt (VMware)
parent 068f530b3f
commit 3e278c0dc1
1 changed files with 24 additions and 16 deletions
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40
kernel/trace/ftrace.c
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@ -1383,9 +1383,8 @@ 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 int
ftrace_hash_move(struct ftrace_ops *ops, int enable,
struct ftrace_hash **dst, struct ftrace_hash *src)
static struct ftrace_hash *
__ftrace_hash_move(struct ftrace_hash *src)
{
struct ftrace_func_entry *entry;
struct hlist_node *tn;
@ -1393,21 +1392,13 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
struct ftrace_hash *new_hash;
int size = src->count;
int bits = 0;
int ret;
int i;
/* Reject setting notrace hash on IPMODIFY ftrace_ops */
if (ops->flags & FTRACE_OPS_FL_IPMODIFY && !enable)
return -EINVAL;
/*
* If the new source is empty, just free dst and assign it
* the empty_hash.
* If the new source is empty, just return the empty_hash.
*/
if (!src->count) {
new_hash = EMPTY_HASH;
goto update;
}
if (!src->count)
return EMPTY_HASH;
/*
* Make the hash size about 1/2 the # found
@ -1421,7 +1412,7 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
new_hash = alloc_ftrace_hash(bits);
if (!new_hash)
return -ENOMEM;
return NULL;
size = 1 << src->size_bits;
for (i = 0; i < size; i++) {
@ -1432,7 +1423,24 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
}
}
update:
return new_hash;
}
static int
ftrace_hash_move(struct ftrace_ops *ops, int enable,
struct ftrace_hash **dst, struct ftrace_hash *src)
{
struct ftrace_hash *new_hash;
int ret;
/* Reject setting notrace hash on IPMODIFY ftrace_ops */
if (ops->flags & FTRACE_OPS_FL_IPMODIFY && !enable)
return -EINVAL;
new_hash = __ftrace_hash_move(src);
if (!new_hash)
return -ENOMEM;
/* Make sure this can be applied if it is IPMODIFY ftrace_ops */
if (enable) {
/* IPMODIFY should be updated only when filter_hash updating */