Commit 240f589d authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Greg Kroah-Hartman

ftrace: Update all ftrace_ops for a ftrace_hash_ops update

commit 84261912 upstream.

When updating what an ftrace_ops traces, if it is registered (that is,
actively tracing), and that ftrace_ops uses the shared global_ops
local_hash, then we need to update all tracers that are active and
also share the global_ops' ftrace_hash_ops.
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7f4ad283
......@@ -1298,9 +1298,9 @@ alloc_and_copy_ftrace_hash(int size_bits, struct ftrace_hash *hash)
}
static void
ftrace_hash_rec_disable(struct ftrace_ops *ops, int filter_hash);
ftrace_hash_rec_disable_modify(struct ftrace_ops *ops, int filter_hash);
static void
ftrace_hash_rec_enable(struct ftrace_ops *ops, int filter_hash);
ftrace_hash_rec_enable_modify(struct ftrace_ops *ops, int filter_hash);
static int
ftrace_hash_move(struct ftrace_ops *ops, int enable,
......@@ -1320,7 +1320,7 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
* Remove the current set, update the hash and add
* them back.
*/
ftrace_hash_rec_disable(ops, enable);
ftrace_hash_rec_disable_modify(ops, enable);
/*
* If the new source is empty, just free dst and assign it
......@@ -1369,7 +1369,7 @@ ftrace_hash_move(struct ftrace_ops *ops, int enable,
* On success, we enable the new hash.
* On failure, we re-enable the original hash.
*/
ftrace_hash_rec_enable(ops, enable);
ftrace_hash_rec_enable_modify(ops, enable);
return ret;
}
......@@ -1613,6 +1613,41 @@ static void ftrace_hash_rec_enable(struct ftrace_ops *ops,
__ftrace_hash_rec_update(ops, filter_hash, 1);
}
static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops,
int filter_hash, int inc)
{
struct ftrace_ops *op;
__ftrace_hash_rec_update(ops, filter_hash, inc);
if (ops->func_hash != &global_ops.local_hash)
return;
/*
* If the ops shares the global_ops hash, then we need to update
* all ops that are enabled and use this hash.
*/
do_for_each_ftrace_op(op, ftrace_ops_list) {
/* Already done */
if (op == ops)
continue;
if (op->func_hash == &global_ops.local_hash)
__ftrace_hash_rec_update(op, filter_hash, inc);
} while_for_each_ftrace_op(op);
}
static void ftrace_hash_rec_disable_modify(struct ftrace_ops *ops,
int filter_hash)
{
ftrace_hash_rec_update_modify(ops, filter_hash, 0);
}
static void ftrace_hash_rec_enable_modify(struct ftrace_ops *ops,
int filter_hash)
{
ftrace_hash_rec_update_modify(ops, filter_hash, 1);
}
static void print_ip_ins(const char *fmt, unsigned char *p)
{
int i;
......
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