netdev - Re: ipv4/tcp.c:4234:1: error: the frame size of 1152 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

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Message-ID: <53ce8db-3372-b5e2-cee7-c0ebe9c45a9@tarent.de>
Date:   Wed, 8 Sep 2021 15:48:31 +0200 (CEST)
From:   Thorsten Glaser <t.glaser@...ent.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Johannes Berg <johannes@...solutions.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Ariel Elior <aelior@...vell.com>,
        GR-everest-linux-l2@...vell.com, Wei Liu <wei.liu@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, lkft-triage@...ts.linaro.org,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: ipv4/tcp.c:4234:1: error: the frame size of 1152 bytes is larger
 than 1024 bytes [-Werror=frame-larger-than=]

On Tue, 7 Sep 2021, Linus Torvalds wrote:

> The do_tcp_getsockopt() one in tpc.c is a classic case of "lots of
> different case statements, many of them with their own struct
> allocations on stack, and all of them disjoint".

Any compiler developers here? AFAIK the compiler knows the lifetime
of function-local variables, so why not alias the actual memory
locations and ranges to minimise stack usage?

bye,
//mirabilos
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