linux-kernel - Re: [PATCH] bridge: multicast: work around clang bug

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Message-Id: <20200527.113524.946608619523725892.davem@davemloft.net>
Date:   Wed, 27 May 2020 11:35:24 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        kuba@...nel.org, tglx@...utronix.de,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] bridge: multicast: work around clang bug

From: Arnd Bergmann <arnd@...db.de>
Date: Wed, 27 May 2020 15:51:13 +0200

> Clang-10 and clang-11 run into a corner case of the register
> allocator on 32-bit ARM, leading to excessive stack usage from
> register spilling:
> 
> net/bridge/br_multicast.c:2422:6: error: stack frame size of 1472 bytes in function 'br_multicast_get_stats' [-Werror,-Wframe-larger-than=]
> 
> Work around this by marking one of the internal functions as
> noinline_for_stack.
> 
> Link: https://bugs.llvm.org/show_bug.cgi?id=45802#c9
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied.