On Mon, 26 Mar 2018 09:25:07 -0700
Alexei Starovoitov <ast@xxxxxx> wrote:
> commit log of patch 6 states:
>
> "for_each_tracepoint_range() api has no users inside the kernel.
> Make it more useful with ability to stop for_each() loop depending
> via callback return value.
> In such form it's used in subsequent patch."
>
> and in patch 7:
>
> +static void *__find_tp(struct tracepoint *tp, void *priv)
> +{
> + char *name = priv;
> +
> + if (!strcmp(tp->name, name))
> + return tp;
> + return NULL;
> +}
> ...
> + struct tracepoint *tp;
> ...
> + tp = for_each_kernel_tracepoint(__find_tp, tp_name);
> + if (!tp)
> + return -ENOENT;
>
> still not obvious?
Please just create a new function called tracepoint_find_by_name(), and
use that. I don't see any benefit in using a for_each* function for
such a simple routine. Not to mention, you then don't need to know the
internals of a tracepoint in kernel/bpf/syscall.c.
-- Steve
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