linux-kernel - Re: [PATCH 1/2] wireless: mt76: call hweight8() instead of __sw

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Message-ID: <87tvh0syq2.fsf@kamboji.qca.qualcomm.com>
Date:   Mon, 18 Feb 2019 21:06:29 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-wireless@...r.kernel.org, Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, Felix Fietkau <nbd@....name>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 1/2] wireless: mt76: call hweight8() instead of __sw_hweight8()

Kalle Valo <kvalo@...eaurora.org> writes:

> Masahiro Yamada <yamada.masahiro@...ionext.com> writes:
>
>> __sw_hweight8() is just internal implementation.
>>
>> Drivers should use the common API, hweight8().
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>
> Acked-by: Kalle Valo <kvalo@...eaurora.org>
>
>> This patch should go to x86 tree along with 2/2.
>>
>> Otherwise, all{yes,mod}config of x86 would be broken.
>>
>> This patch is trivial enough.
>> I want ACK from the net/wireless maintainer
>> so that this can go in via x86 tree.
>
> Sounds good to me, feel free to push via the x86 tree.

Actually, can you wait a bit? Felix just reminded me that we have a
similar patch pending from Ben Hutchings:

https://patchwork.kernel.org/patch/10808203/

And it seems there are two instances of __sw_hweight8, at least in my
wireless-drivers-next tree:

drivers/net/wireless/mediatek/mt76/mac80211.c:  int i, nstream = __sw_hweight8(dev->antenna_mask);
drivers/net/wireless/mediatek/mt76/mac80211.c:  int n_chains = __sw_hweight8(dev->antenna_mask);

So we need to think what to do.

-- 
Kalle Valo