linux-kernel - Re: [PATCH v5 01/10] kunit: string-stream: Don't create a fragment for empty strings

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Message-ID: <CABVgOSk+7XXT3GarvUUQuy7odEfqW9g1=GY4tHF=TyhaS=n5_Q@mail.gmail.com>
Date:   Fri, 25 Aug 2023 14:49:11 +0800
From:   David Gow <davidgow@...gle.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     brendan.higgins@...ux.dev, rmoar@...gle.com,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH v5 01/10] kunit: string-stream: Don't create a fragment
 for empty strings

On Thu, 24 Aug 2023 at 22:32, 'Richard Fitzgerald' via KUnit
Development <kunit-dev@...glegroups.com> wrote:
>
> If the result of the formatted string is an empty string just return
> instead of creating an empty fragment.
>
> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
> ---

Reviewed-by: David Gow <davidgow@...gle.com>

Cheers,
-- David


>  lib/kunit/string-stream.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c
> index cc32743c1171..ed24d86af9f5 100644
> --- a/lib/kunit/string-stream.c
> +++ b/lib/kunit/string-stream.c
> @@ -50,11 +50,17 @@ int string_stream_vadd(struct string_stream *stream,
>         /* Make a copy because `vsnprintf` could change it */
>         va_copy(args_for_counting, args);
>
> -       /* Need space for null byte. */
> -       len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
> +       /* Evaluate length of formatted string */
> +       len = vsnprintf(NULL, 0, fmt, args_for_counting);
>
>         va_end(args_for_counting);
>
> +       if (len == 0)
> +               return 0;
> +
> +       /* Need space for null byte. */
> +       len++;
> +
>         frag_container = alloc_string_stream_fragment(stream->test,
>                                                       len,
>                                                       stream->gfp);
> --
> 2.30.2
>
> --
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