Re: linux-next: build warnings after merge of the kbuild tree

[Kees Cook]

On Wed, May 30, 2018 at 6:12 PM, Masahiro Yamada
<yamada.masahiro@xxxxxxxxxxxxx> wrote:
> Hi.
> (+CC Kees)
>
> 2018-05-31 7:40 GMT+09:00 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>:
>> Hi Masahiro,
>>
>> After merging the kbuild tree, today's linux-next build (x86_64
>> allmodconfig) produced these warnings:
>>
>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_workarounds_nphy_rev7':
>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16563:1: warning: the frame size of 3136 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>  }
>>  ^
>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_workarounds_nphy_rev3':
>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16905:1: warning: the frame size of 2872 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>  }
>>  ^
>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_cal_txiqlo_nphy':
>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:26033:1: warning: the frame size of 2432 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>  }
>>  ^
>>
>> I have no idea what caused these warnings to appear ... nothing in those
>> functions looks too bad.
>
>
> This has been triggered by the following commit:
>
>
> commit 0e461945f3504e09b8ecf947b6398adce1287a28
> Author: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> Date:   Mon May 28 18:22:07 2018 +0900
>
>     gcc-plugins: allow to enable GCC_PLUGINS for COMPILE_TEST
>
>
>
> CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL was previously disabled
> for COMPILE_TEST, which is now enabled.

Weird -- I do build tests with plugins enabled pretty regularly. I
hadn't seen this before. I'll see if I can figure out what the
combination is...

> COMPILE_TEST now enables GCC plugin for wider test coverage,
> this is a good thing in general.

Yes indeed!

-Kees

-- 
Kees Cook
Pixel Security