linux-kernel - Re: [PATCH v2 08/11] brcmsmac: make some local variables 'static const' to reduce stack size

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Date:   Thu, 15 Jun 2017 17:56:27 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        linux-wireless@...r.kernel.org, brcm80211-dev-list.pdl@...adcom.com
Subject: Re: [PATCH v2 08/11] brcmsmac: make some local variables 'static const' to reduce stack size

Arnd Bergmann <arnd@...db.de> writes:

> 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>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

I found the cover letter from lkml and apparently the plan is that
Andrew will pick these three brcmsmac patches, so I'll drop them in
wireless patchwork.

-- 
Kalle Valo