linux-kernel - Re: [PATCH 4/4] wifi: ath11k: Use DECLARE_FLEX_ARRAY() for ath11k_htc

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Message-ID: <875y1cpghd.fsf@kernel.org>
Date:   Tue, 05 Dec 2023 22:00:14 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Jeff Johnson <quic_jjohnson@...cinc.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>, ath10k@...ts.infradead.org,
        ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] wifi: ath11k: Use DECLARE_FLEX_ARRAY() for
 ath11k_htc_record

"Gustavo A. R. Silva" <gustavo@...eddedor.com> writes:

> On 12/5/23 09:29, Kalle Valo wrote:
>> Jeff Johnson <quic_jjohnson@...cinc.com> writes:
>> 
>>> On 11/27/2023 8:23 AM, Gustavo A. R. Silva wrote:
>>>
>>>>
>>>>
>>>> On 11/27/23 10:14, Jeff Johnson wrote:
>>>>> Transform the zero-length array in ath11k_htc_record into a proper
>>>>> flexible array via the DECLARE_FLEX_ARRAY() macro. This helps with
>>>>> ongoing efforts to globally enable -Warray-bounds.
>>>>>
>>>>> Signed-off-by: Jeff Johnson <quic_jjohnson@...cinc.com>
>>>>> ---
>>>>>    drivers/net/wireless/ath/ath11k/htc.h | 2 +-
>>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/net/wireless/ath/ath11k/htc.h b/drivers/net/wireless/ath/ath11k/htc.h
>>>>> index 84971cc9251c..e0434b29df70 100644
>>>>> --- a/drivers/net/wireless/ath/ath11k/htc.h
>>>>> +++ b/drivers/net/wireless/ath/ath11k/htc.h
>>>>> @@ -151,7 +151,7 @@ struct ath11k_htc_credit_report {
>>>>>    struct ath11k_htc_record {
>>>>>    	struct ath11k_htc_record_hdr hdr;
>>>>>    	union {
>>>>> -		struct ath11k_htc_credit_report credit_report[0];
>>>>> +		DECLARE_FLEX_ARRAY(struct ath11k_htc_credit_report, credit_report);
>>>>>    	};
>>>>
>>>> Why not removing the `union` and just do a direct transformation [0] -> [ ] ?
>>>
>>> No reason other than staying consistent with ath10k.
>>> Will see if Kalle has an opinion on this.
>> Yeah, I don't see the need for the union and I removed it in the
>> pending
>> branch:
>> https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=a2faeea1fe0635563187e7821a6d0baf7b40f2c6
>> Does it look ok?
>> 
>
> Nope.
>
> A direct transformation is just fine:
>
> -	union {
> -		struct ath11k_htc_credit_report credit_report[0];
> -	};
> +	struct ath11k_htc_credit_report credit_report[];
>
> There is no need for DFA in this situation.

Sorry, I read your comments too hastily. Jeff, as I'm offline tomorrow
would you mind submitting v2?

-- 
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