linux-kernel - Re: [RFC PATCH bpf-next v2 3/4] error-injection: Separate error-injection from kprobe

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Date:   Tue, 26 Dec 2017 18:07:05 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Alexei Starovoitov <ast@...com>, Josef Bacik <jbacik@...com>,
        rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, kernel-team@...com, daniel@...earbox.net,
        linux-btrfs@...r.kernel.org, darrick.wong@...cle.com,
        Josef Bacik <josef@...icpanda.com>,
        Akinobu Mita <akinobu.mita@...il.com>
Subject: Re: [RFC PATCH bpf-next v2 3/4] error-injection: Separate
 error-injection from kprobe

On Tue, Dec 26, 2017 at 04:47:55PM +0900, Masami Hiramatsu wrote:
> Since error-injection framework is not limited to be used
> by kprobes, nor bpf. Other kernel subsystems can use it
> freely for checking safeness of error-injection, e.g.
> livepatch, ftrace etc.
> So this separate error-injection framework from kprobes.
> 
> Some differences has been made:
> 
> - "kprobe" word is removed from any APIs/structures.
> - BPF_ALLOW_ERROR_INJECTION() is renamed to
>   ALLOW_ERROR_INJECTION() since it is not limited for BPF too.
> - CONFIG_FUNCTION_ERROR_INJECTION is the config item of this
>   feature. It is automatically enabled if the arch supports
>   error injection feature for kprobe or ftrace etc.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>   Changes in v2:
>    - Fix the override function name to override_function_with_return()
>    - Show only function name in the list, user don't have to care about
>      it's size, since function override only happens at the entry.

looks like nice cleanup.
Acked-by: Alexei Starovoitov <ast@...nel.org>