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Date:   Mon, 25 Sep 2017 20:19:51 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH v4 8/9] netlink: fix nla_put_{u8,u16,u32} for KASAN

From: Arnd Bergmann <>
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 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:
> Link:
> Signed-off-by: Arnd Bergmann <>


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