linux-kernel - Re: [PATCH] fault-injection: handle EI_ETYPE

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Message-Id: <20200925021045.d45f862caf4011767bbafba3@kernel.org>
Date:   Fri, 25 Sep 2020 02:10:45 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Barnabás Pőcze <pobrn@...tonmail.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Akinobu Mita <akinobu.mita@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH] fault-injection: handle EI_ETYPE_TRUE

On Thu, 24 Sep 2020 16:48:56 +0000
Barnabás Pőcze <pobrn@...tonmail.com> wrote:

> Commit af3b854492f351d1ff3b4744a83bf5ff7eed4920
> ("mm/page_alloc.c: allow error injection")
> introduced EI_ETYPE_TRUE, but did not extend
>  * lib/error-inject.c:error_type_string(), and
>  * kernel/fail_function.c:adjust_error_retval()
> to accommodate for this change.
> 
> Handle EI_ETYPE_TRUE in both functions appropriately by
>  * returning "TRUE" in error_type_string(),
>  * adjusting the return value to true (1) in adjust_error_retval().
> 
> Furthermore, simplify the logic of handling EI_ETYPE_NULL
> in adjust_error_retval().

This looks good to me.

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you!

> 
> Signed-off-by: Barnabás Pőcze <pobrn@...tonmail.com>
> ---
>  kernel/fail_function.c | 6 +++---
>  lib/error-inject.c     | 2 ++
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/fail_function.c b/kernel/fail_function.c
> index 63b349168da7..4fdea01c0561 100644
> --- a/kernel/fail_function.c
> +++ b/kernel/fail_function.c
> @@ -37,9 +37,7 @@ static unsigned long adjust_error_retval(unsigned long addr, unsigned long retv)
>  {
>  	switch (get_injectable_error_type(addr)) {
>  	case EI_ETYPE_NULL:
> -		if (retv != 0)
> -			return 0;
> -		break;
> +		return 0;
>  	case EI_ETYPE_ERRNO:
>  		if (retv < (unsigned long)-MAX_ERRNO)
>  			return (unsigned long)-EINVAL;
> @@ -48,6 +46,8 @@ static unsigned long adjust_error_retval(unsigned long addr, unsigned long retv)
>  		if (retv != 0 && retv < (unsigned long)-MAX_ERRNO)
>  			return (unsigned long)-EINVAL;
>  		break;
> +	case EI_ETYPE_TRUE:
> +		return 1;
>  	}
> 
>  	return retv;
> diff --git a/lib/error-inject.c b/lib/error-inject.c
> index aa63751c916f..c73651b15b76 100644
> --- a/lib/error-inject.c
> +++ b/lib/error-inject.c
> @@ -180,6 +180,8 @@ static const char *error_type_string(int etype)
>  		return "ERRNO";
>  	case EI_ETYPE_ERRNO_NULL:
>  		return "ERRNO_NULL";
> +	case EI_ETYPE_TRUE:
> +		return "TRUE";
>  	default:
>  		return "(unknown)";
>  	}
> --
> 2.28.0
> 
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>