linux-kernel - Re: [PATCH] mac80211: Do not use sizeof() on pointer type

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Date:	Wed, 26 Aug 2015 22:40:26 +0200
From:	Arend van Spriel <arend@...adcom.com>
To:	Thierry Reding <thierry.reding@...il.com>,
	Johannes Berg <johannes@...solutions.net>
CC:	"David S. Miller" <davem@...emloft.net>,
	<linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mac80211: Do not use sizeof() on pointer type

On 08/26/2015 10:23 PM, Arend van Spriel wrote:
> On 08/26/2015 12:22 PM, Thierry Reding wrote:
>> From: Thierry Reding <treding@...dia.com>
>>
>> The rate_control_cap_mask() function takes a parameter mcs_mask, which
>> GCC will take to be u8 * even though it was declared with a fixed size.
>> This causes the following warning:
>>
>>     net/mac80211/rate.c: In function 'rate_control_cap_mask':
>>     net/mac80211/rate.c:719:25: warning: 'sizeof' on array function
>> parameter 'mcs_mask' will return size of 'u8 * {aka unsigned char *}'
>> [-Wsizeof-array-argument]
>>        for (i = 0; i < sizeof(mcs_mask); i++)
>>                              ^
>>     net/mac80211/rate.c:684:10: note: declared here
>>            u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
>>               ^
>>
>> This can be easily fixed by using the IEEE80211_HT_MCS_MASK_LEN directly
>> within the loop condition.
>
> Or use ARRAY_SIZE(mcs_mask).

Better not. Missed the 'function parameter' bit. Sorry for the noise.

Regards,
Arend

> Regards,
> Arend
>
>> Signed-off-by: Thierry Reding <treding@...dia.com>
>> ---
>>   net/mac80211/rate.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
>> index 9857693b91ec..9ce8883d5f44 100644
>> --- a/net/mac80211/rate.c
>> +++ b/net/mac80211/rate.c
>> @@ -716,7 +716,7 @@ static bool rate_control_cap_mask(struct
>> ieee80211_sub_if_data *sdata,
>>
>>           /* Filter out rates that the STA does not support */
>>           *mask &= sta->supp_rates[sband->band];
>> -        for (i = 0; i < sizeof(mcs_mask); i++)
>> +        for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
>>               mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
>>
>>           sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
>>
>
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