linux-kernel - Re: [PATCH v2] staging: rtl8723bs: Use % 4096 instead of & 0xfff

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Message-ID: <2d2dbebf-b4bb-74c0-14cd-b7ffbe3894e4@inria.fr>
Date: Fri, 4 Apr 2025 20:33:33 -0400 (EDT)
From: Julia Lawall <julia.lawall@...ia.fr>
To: Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, julia.lawall@...ia.fr, 
    andy@...nel.org, dan.carpenter@...aro.org, linux-staging@...ts.linux.dev, 
    linux-kernel@...r.kernel.org, outreachy@...ts.linux.dev
Subject: Re: [PATCH v2] staging: rtl8723bs: Use % 4096 instead of & 0xfff



On Sat, 5 Apr 2025, Abraham Samuel Adekunle wrote:

> Replace the bitwise AND operator `&` with a modulo
> operator `%` and decimal number to make the upper limit visible
> and clear what the semantic of it is.

I think that the & and the Fs are more understandable than using the % and
4096.  I would say no for this idea.

> Also add white spaces around binary operators for improved
> readabiity and adherence to Linux kernel coding style.

The "Also" is a hint that you are doing two things.  So they can be in two
different patches.

julia

>
> Suggested-by Andy Shevchenko <andy.shevchenko@...il.com>
>
> Signed-off-by: Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
> ---
> Changes in v1:
> 	- Added more patch recipients.
>
>  drivers/staging/rtl8723bs/core/rtw_xmit.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/rtl8723bs/core/rtw_xmit.c b/drivers/staging/rtl8723bs/core/rtw_xmit.c
> index 297c93d65315..630669193be4 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_xmit.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_xmit.c
> @@ -943,7 +943,7 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr
>
>  			if (psta) {
>  				psta->sta_xmitpriv.txseq_tid[pattrib->priority]++;
> -				psta->sta_xmitpriv.txseq_tid[pattrib->priority] &= 0xFFF;
> +				psta->sta_xmitpriv.txseq_tid[pattrib->priority] %= 4096;
>  				pattrib->seqnum = psta->sta_xmitpriv.txseq_tid[pattrib->priority];
>
>  				SetSeqNum(hdr, pattrib->seqnum);
> @@ -963,11 +963,11 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr
>  					if (SN_LESS(pattrib->seqnum, tx_seq)) {
>  						pattrib->ampdu_en = false;/* AGG BK */
>  					} else if (SN_EQUAL(pattrib->seqnum, tx_seq)) {
> -						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (tx_seq+1)&0xfff;
> +						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (tx_seq + 1) % 4096;
>
>  						pattrib->ampdu_en = true;/* AGG EN */
>  					} else {
> -						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (pattrib->seqnum+1)&0xfff;
> +						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (pattrib->seqnum + 1) % 4096;
>  						pattrib->ampdu_en = true;/* AGG EN */
>  					}
>  				}
> --
> 2.34.1
>
>