linux-kernel - Re: [PATCH v4 07/10] kunit: string-stream: Decouple string

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Date:   Tue, 15 Aug 2023 11:51:47 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     David Gow <davidgow@...gle.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 v4 07/10] kunit: string-stream: Decouple string_stream
 from kunit

On 15/8/23 10:16, David Gow wrote:
> On Mon, 14 Aug 2023 at 21:23, Richard Fitzgerald
> <rf@...nsource.cirrus.com> wrote:
>>
>> Re-work string_stream so that it is not tied to a struct kunit. This is
>> to allow using it for the log of struct kunit_suite.
>>
>> Instead of resource-managing individual allocations the whole string_stream
>> object can be resource-managed as a single object:
>>
>>      alloc_string_stream() API is unchanged and takes a pointer to a
>>      struct kunit but it now registers the returned string_stream object to
>>      be resource-managed.
>>
>>      raw_alloc_string_stream() is a new function that allocates a
>>      bare string_stream without any association to a struct kunit.
>>
>>      free_string_stream() is a new function that frees a resource-managed
>>      string_stream allocated by alloc_string_stream().
>>
>>      raw_free_string_stream() is a new function that frees a non-managed
>>      string_stream allocated by raw_alloc_string_stream().
>>
>> The confusing function string_stream_destroy() has been removed. This only
>> called string_stream_clear() but didn't free the struct string_stream.
>> Instead string_stream_clear() has been exported, and the new functions use
>> the more conventional naming of "free" as the opposite of "alloc".
>>
>> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
>> ---
> 
> I'm in favour of this. Should we go further and get rid of the struct
> kunit member from string_stream totally?
>

I can do that. I was worried about some hairy-looking code in assert.c
that used stream->test. But I've just looked at it again and it's
really quite simple, and doesn't even need ->test. is_literal()
allocates a temporary managed buffer, but it frees it before returning
so it doesn't need to be managed.

> Also, note that the kunit_action_t casting is causing warnings on some
> clang configs (and technically isn't valid C). Personally, I still
> like it, but expect more emails from the kernel test robot and others.
> 

I can send a new version to fix that.