linux-kernel - Re: [RFC PATCH bpf-next v2 4/4] error-injection: Support fault injection framework

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Date:   Tue, 26 Dec 2017 18:12:56 -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 4/4] error-injection: Support fault
 injection framework

On Tue, Dec 26, 2017 at 04:48:25PM +0900, Masami Hiramatsu wrote:
> Support in-kernel fault-injection framework via debugfs.
> This allows you to inject a conditional error to specified
> function using debugfs interfaces.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  Documentation/fault-injection/fault-injection.txt |    5 +
>  kernel/Makefile                                   |    1 
>  kernel/fail_function.c                            |  169 +++++++++++++++++++++
>  lib/Kconfig.debug                                 |   10 +
>  4 files changed, 185 insertions(+)
>  create mode 100644 kernel/fail_function.c
> 
> diff --git a/Documentation/fault-injection/fault-injection.txt b/Documentation/fault-injection/fault-injection.txt
> index 918972babcd8..6243a588dd71 100644
> --- a/Documentation/fault-injection/fault-injection.txt
> +++ b/Documentation/fault-injection/fault-injection.txt
> @@ -30,6 +30,11 @@ o fail_mmc_request
>    injects MMC data errors on devices permitted by setting
>    debugfs entries under /sys/kernel/debug/mmc0/fail_mmc_request
>  
> +o fail_function
> +
> +  injects error return on specific functions by setting debugfs entries
> +  under /sys/kernel/debug/fail_function. No boot option supported.

I like it.
Could you document it a bit better?
In particular retval is configurable, but without an example no one
will be able to figure out how to use it.

I think you can drop RFC tag from the next version of these patches.
Thanks!