linux-kernel - Re: [PATCH 08/26] brcmsmac: make some local variables 'static const' to reduce stack size

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Message-ID: <2e8b7c30-41d5-b605-d502-6b914507e4e1@broadcom.com>
Date:   Tue, 7 Mar 2017 10:55:36 +0100
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Kalle Valo <kvalo@...eaurora.org>, Arnd Bergmann <arnd@...db.de>
Cc:     kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org,
        linux-wireless <linux-wireless@...r.kernel.org>,
        kernel-build-reports@...ts.linaro.org,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH 08/26] brcmsmac: make some local variables 'static const'
 to reduce stack size

On 7-3-2017 10:44, Kalle Valo wrote:
> Arnd Bergmann <arnd@...db.de> writes:
> 
>> On Mon, Mar 6, 2017 at 5:19 PM, Kalle Valo <kvalo@...eaurora.org> wrote:
>>> Arend Van Spriel <arend.vanspriel@...adcom.com> writes:
>>>
>>>> On 2-3-2017 17:38, Arnd Bergmann wrote:
>>>>> With KASAN and a couple of other patches applied, this driver is one
>>>>> of the few remaining ones that actually use more than 2048 bytes of
>>>>> kernel stack:
>>>>>
>>>>> broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function
>>>>> 'wlc_phy_workarounds_nphy_gainctrl':
>>>>> broadcom/brcm80211/brcmsmac/phy/phy_n.c:16065:1: warning: the
>>>>> frame size of 3264 bytes is larger than 2048 bytes
>>>>> [-Wframe-larger-than=]
>>>>> broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_workarounds_nphy':
>>>>> broadcom/brcm80211/brcmsmac/phy/phy_n.c:17138:1: warning: the
>>>>> frame size of 2864 bytes is larger than 2048 bytes
>>>>> [-Wframe-larger-than=]
>>>>>
>>>>> Here, I'm reducing the stack size by marking as many local variables as
>>>>> 'static const' as I can without changing the actual code.
>>>>
>>>> Acked-by: Arend van Spriel <arend.vanspriel@...adcom.com>
>>>
>>> Arnd, via which tree are you planning to submit these? I'm not sure
>>> what I should do with the wireless drivers patches from this series.
>>
>> I'm not quite sure myself yet. I'd probably want the first few patches that
>> do most of the work get merged through Andrew's linux-mm tree once
>> we have come to agreement on them. The driver specific patches like
>> the brcmsmac ones depend on the introduction of noinline_for_kasan
>> or noinline_if_stackbloat and could either go in along with the first
>> set, or as a follow-up through the normal maintainer trees.
> 
> Either way is fine for me. Just mark clearly if you want the wireless
> drivers patches to go through via my tree, otherwise I'll ignore them.

That (dreaded) phy code does not get a lot of changes so I think it does
not matter which tree is will go through in terms of risk for conflicts.
So going through linux-mm is fine for me as well.

Regards,
Arend