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

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Date:   Mon, 18 Feb 2019 21:20:46 +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:

> 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.

I think the best would be that Felix applies Ben's patch to the wireless
tree and I'll push it to Linus during the next merge window (via
net-next). Simpler and less conflicts that way.

So Masahiro, could you hold your x86 patch for a while until the mt76
patch will be in Linus' tree? That should not take more than two weeks,
I think.

-- 
Kalle Valo