Hi Jessica,
Since this is under discussion about ftrace part, I just comment another one.
On Thu, 2 Nov 2017 17:33:33 +0100
Jessica Yu <j...@kernel.org> wrote:
[...]
> @@ -1362,9 +1372,14 @@ static int register_aggr_kprobe(struct kprobe *orig_p,
> struct kprobe *p)
>
> if (ret == 0 && kprobe_disabled(ap) && !kprobe_disabled(p)) {
> ap->flags &= ~KPROBE_FLAG_DISABLED;
> - if (!kprobes_all_disarmed)
> + if (!kprobes_all_disarmed) {
> /* Arm the breakpoint again. */
> - arm_kprobe(ap);
> + ret = arm_kprobe(ap);
> + if (ret) {
> + ap->flags |= KPROBE_FLAG_DISABLED;
> + list_del_rcu(&p->list);
You also have to wait rcu here.
> + }
> + }
> }
> return ret;
> }
[...]
> @@ -2428,16 +2452,26 @@ static void arm_all_kprobes(void)
> /* Arming kprobes doesn't optimize kprobe itself */
> for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
> head = &kprobe_table[i];
> - hlist_for_each_entry_rcu(p, head, hlist)
> - if (!kprobe_disabled(p))
> - arm_kprobe(p);
> + /* Arm all kprobes on a best-effort basis */
> + hlist_for_each_entry_rcu(p, head, hlist) {
> + if (!kprobe_disabled(p)) {
> + err = arm_kprobe(p);
> + if (err) {
> + errors++;
> + ret = err;
> + }
> + }
> + }
> }
>
> - printk(KERN_INFO "Kprobes globally enabled\n");
> + if (errors)
> + pr_warn("Kprobes globally enabled, but failed to arm %d
> kprobes\n", errors);
The last "kprobes" should be "probes" because it can include kretprobes :P
Thank you,
--
Masami Hiramatsu <mhira...@kernel.org>
