[PATCH v3 5/7] kernel: Use mutable list iterators

[bot+bpf-ci at kernel.org]

> diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c
> index c4dfbc293bae..9e076106bee7 100644
> --- a/kernel/trace/trace_dynevent.c
> +++ b/kernel/trace/trace_dynevent.c

[ ... ]

> @@ -100,7 +100,7 @@ int dyn_event_release(const char *raw_command, struct dyn_event_operations *type
>  		return -EINVAL;
>
>  	mutex_lock(&event_mutex);
> -	for_each_dyn_event_safe(pos, n) {
> +	for_each_dyn_event_safe(pos) {
>  		if (type && type != pos->ops)
>  			continue;
>  		if (!pos->ops->match(system, event,

Does this leave the variable n unused? Looking at the function
declaration around line 74, it still has:

	struct dyn_event *pos, *n;

but after this change n is no longer passed to for_each_dyn_event_safe().
The macro now hides the temporary cursor internally, so n appears to be
dead code. This would trigger -Wunused-variable warnings and break builds
with CONFIG_WERROR=y.

For comparison, the sibling change at line 219 (dyn_events_release_all)
correctly removed the *tmp variable from its declaration.

> diff --git a/kernel/trace/trace_dynevent.h b/kernel/trace/trace_dynevent.h
> index beee3f8d7544..a4dc0812284f 100644
> --- a/kernel/trace/trace_dynevent.h
> +++ b/kernel/trace/trace_dynevent.h
> @@ -115,10 +115,9 @@ int dyn_event_create(const char *raw_command, struct dyn_event_operations *type)
>  /*
>   * for_each_dyn_event	-	iterate over the dyn_event list safely
>   * @pos:	the struct dyn_event * to use as a loop cursor
> - * @n:		the struct dyn_event * to use as temporary storage
>   */
> -#define for_each_dyn_event_safe(pos, n)	\
> -	list_for_each_entry_safe(pos, n, &dyn_event_list, list)
> +#define for_each_dyn_event_safe(pos)	\
> +	list_for_each_entry_mutable(pos, &dyn_event_list, list)


---
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See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md

CI run summary: https://github.com/kernel-patches/bpf/actions/runs/27930295027