From: Arnd Bergmann <a...@arndb.de>
Date: Fri, 22 Sep 2017 23:29:19 +0200
> When CONFIG_KASAN is enabled, the "--param asan-stack=1" causes rather large
> stack frames in some functions. This goes unnoticed normally because
> CONFIG_FRAME_WARN is disabled with CONFIG_KASAN by default as of commit
> 3f181b4d8652 ("lib/Kconfig.debug: disable -Wframe-larger-than warnings with
> KASAN=y").
>
> The kernelci.org build bot however has the warning enabled and that led
> me to investigate it a little further, as every build produces these warnings:
>
> net/wireless/nl80211.c:4389:1: warning: the frame size of 2240 bytes is
> larger than 2048 bytes [-Wframe-larger-than=]
> net/wireless/nl80211.c:1895:1: warning: the frame size of 3776 bytes is
> larger than 2048 bytes [-Wframe-larger-than=]
> net/wireless/nl80211.c:1410:1: warning: the frame size of 2208 bytes is
> larger than 2048 bytes [-Wframe-larger-than=]
> net/bridge/br_netlink.c:1282:1: warning: the frame size of 2544 bytes is
> larger than 2048 bytes [-Wframe-larger-than=]
>
> Most of this problem is now solved in gcc-8, which can consolidate
> the stack slots for the inline function arguments. On older compilers
> we can add a workaround by declaring a local variable in each function
> to pass the inline function argument.
>
> Cc: sta...@vger.kernel.org
> Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
Applied.
