linux-kernel - Re: [PATCH 2/3] uprobes: fold __uprobe_unregister() into uprobe

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Message-ID: <CAEf4Bza7FEXZQWx_yKw0tNjEs9s-e75PQUAuFmKOi+yUTpqcDw@mail.gmail.com>
Date: Tue, 30 Jul 2024 08:01:40 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: andrii@...nel.org, mhiramat@...nel.org, peterz@...radead.org, 
	jolsa@...nel.org, rostedt@...dmis.org, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] uprobes: fold __uprobe_unregister() into uprobe_unregister()

On Tue, Jul 30, 2024 at 5:35 AM Oleg Nesterov <oleg@...hat.com> wrote:
>
> Fold __uprobe_unregister() into its single caller, uprobe_unregister().
> A separate patch to simplify the next change.
>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  kernel/events/uprobes.c | 25 ++++++++++---------------
>  1 file changed, 10 insertions(+), 15 deletions(-)
>

LGTM

Acked-by: Andrii Nakryiko <andrii@...nel.org>

> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index 5ea0aabe8774..c06e1a5f1783 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -1085,20 +1085,6 @@ register_for_each_vma(struct uprobe *uprobe, struct uprobe_consumer *new)
>         return err;
>  }
>
> -static void
> -__uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
> -{
> -       int err;
> -
> -       if (WARN_ON(!consumer_del(uprobe, uc)))
> -               return;
> -
> -       err = register_for_each_vma(uprobe, NULL);
> -       /* TODO : cant unregister? schedule a worker thread */
> -       if (!uprobe->consumers && !err)
> -               delete_uprobe(uprobe);
> -}
> -
>  /**
>   * uprobe_unregister - unregister an already registered probe.
>   * @uprobe: uprobe to remove
> @@ -1106,9 +1092,18 @@ __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
>   */
>  void uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
>  {
> +       int err;
> +
>         get_uprobe(uprobe);
>         down_write(&uprobe->register_rwsem);
> -       __uprobe_unregister(uprobe, uc);
> +       if (WARN_ON(!consumer_del(uprobe, uc)))
> +               err = -ENOENT;
> +       else
> +               err = register_for_each_vma(uprobe, NULL);
> +
> +       /* TODO : cant unregister? schedule a worker thread */
> +       if (!err && !uprobe->consumers)
> +               delete_uprobe(uprobe);
>         up_write(&uprobe->register_rwsem);
>         put_uprobe(uprobe);
>  }
> --
> 2.25.1.362.g51ebf55
>