On Tue, Jun 04, 2024 at 05:28:21PM -0400, Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rost...@goodmis.org>
>
> The parameters "filter_hash" and "inc" in the function
> ftrace_hash_rec_update_modify() are boolean. Change them to be such.
>
> Also add documentation to what the function does.
>
> Signed-off-by: Steven Rostedt (Google) <rost...@goodmis.org>
Aside from the issue with forward declarations that need to be updated,
this looks good to me, so with that fixed:
Acked-by: Mark Rutland <mark.rutl...@arm.com>
Mark.
> ---
> kernel/trace/ftrace.c | 33 ++++++++++++++++++++++++++++-----
> 1 file changed, 28 insertions(+), 5 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index de652201c86c..021024164938 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -1915,8 +1915,31 @@ static bool ftrace_hash_rec_enable(struct ftrace_ops
> *ops)
> return __ftrace_hash_rec_update(ops, true, 1);
> }
>
> +/*
> + * This function will update what functions @ops traces when its filter
> + * changes. @filter_hash is set to true when modifying the filter_hash
> + * and set to false when modifying the notrace_hash.
> + *
> + * For example, if the user does: echo schedule > set_ftrace_filter
> + * that would call: ftrace_hash_rec_update_modify(ops, true, true);
> + *
> + * For: echo schedule >> set_ftrace_notrace
> + * That would call: ftrace_hash_rec_enable(ops, false, true);
> + *
> + * The @inc states if the @ops callbacks are going to be added or removed.
> + * The dyn_ftrace records are update via:
> + *
> + * ftrace_hash_rec_disable_modify(ops, filter_hash);
> + * ops->hash = new_hash
> + * ftrace_hash_rec_enable_modify(ops, filter_hash);
> + *
> + * Where the @ops is removed from all the records it is tracing using
> + * its old hash. The @ops hash is updated to the new hash, and then
> + * the @ops is added back to the records so that it is tracing all
> + * the new functions.
> + */
> static void ftrace_hash_rec_update_modify(struct ftrace_ops *ops,
> - int filter_hash, int inc)
> + bool filter_hash, bool inc)
> {
> struct ftrace_ops *op;
>
> @@ -1939,15 +1962,15 @@ static void ftrace_hash_rec_update_modify(struct
> ftrace_ops *ops,
> }
>
> static void ftrace_hash_rec_disable_modify(struct ftrace_ops *ops,
> - int filter_hash)
> + bool filter_hash)
> {
> - ftrace_hash_rec_update_modify(ops, filter_hash, 0);
> + ftrace_hash_rec_update_modify(ops, filter_hash, false);
> }
>
> static void ftrace_hash_rec_enable_modify(struct ftrace_ops *ops,
> - int filter_hash)
> + bool filter_hash)
> {
> - ftrace_hash_rec_update_modify(ops, filter_hash, 1);
> + ftrace_hash_rec_update_modify(ops, filter_hash, true);
> }
>
> /*
> --
> 2.43.0
>
>
