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Message-ID: <83f73eda-829d-2657-9f10-8ccf78522e5a@kernel.org>
Date: Wed, 9 Aug 2023 12:40:44 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: mickflemm@...il.com, mcgrof@...nel.org, kvalo@...nel.org,
linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] ath5k: fix WARNING opportunity for swap.
On 08. 08. 23, 21:42, Mahmoud Matook wrote:
> On 08/08, Jiri Slaby wrote:
>
>> On 07. 08. 23, 22:10, Mahmoud Maatuq wrote:
>>> coccinielle reported the following:
>>> ./drivers/net/wireless/ath/ath5k/phy.c:1573:25-26: WARNING opportunity for swap()
>>
>>
>> OK, once again:
>> https://lore.kernel.org/all/0c3acbd4-6ab2-5cc5-6293-54e30093cce2@kernel.org/
>
>
> I had a look at the commit history, to see why the original developer
> didn't use sort() function, and name the array variable sort but found
> nothing.
> I have some doubts that he might did that intentionally, so not to call
> sort() function for such small array
It happens once in 10 s and in a work. No worries about that.
> and avoid the cost of context switching.
What context switching?
>>> diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
>>> index 5797ef9c73d7..f87eb684f223 100644
>>> --- a/drivers/net/wireless/ath/ath5k/phy.c
>>> +++ b/drivers/net/wireless/ath/ath5k/phy.c
>>> @@ -1562,16 +1562,13 @@ static s16
>>> ath5k_hw_get_median_noise_floor(struct ath5k_hw *ah)
>>> {
>>> s16 sort[ATH5K_NF_CAL_HIST_MAX];
>>> - s16 tmp;
>>> int i, j;
>>> memcpy(sort, ah->ah_nfcal_hist.nfval, sizeof(sort));
>>> for (i = 0; i < ATH5K_NF_CAL_HIST_MAX - 1; i++) {
>>> for (j = 1; j < ATH5K_NF_CAL_HIST_MAX - i; j++) {
>>> if (sort[j] > sort[j - 1]) {
>>> - tmp = sort[j];
>>> - sort[j] = sort[j - 1];
>>> - sort[j - 1] = tmp;
>>> + swap(sort[j], sort[j - 1]);
>>> }
>>> }
>>> }
>>
>> --
>> js
>> suse labs
--
js
suse labs
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