linux-kernel - Re: [PATCH net-next v4] net: skb: prevent the split of kfree_skb

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Message-ID: <871qt86711.fsf@oldenburg.str.redhat.com>
Date:   Mon, 22 Aug 2022 10:01:46 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Menglong Dong <menglong8.dong@...il.com>
Cc:     Segher Boessenkool <segher@...nel.crashing.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>, kuba@...nel.org,
        miguel.ojeda.sandonis@...il.com, ojeda@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        asml.silence@...il.com, imagedong@...cent.com,
        luiz.von.dentz@...el.com, vasily.averin@...ux.dev,
        jk@...econstruct.com.au, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, kernel test robot <lkp@...el.com>,
        linux-toolchains <linux-toolchains@...r.kernel.org>
Subject: Re: [PATCH net-next v4] net: skb: prevent the split of
 kfree_skb_reason() by gcc

* Menglong Dong:

> /*
>  * Used by functions that use '__builtin_return_address'. These function
>  * don't want to be splited or made inline, which can make
>  * the '__builtin_return_address' got unexpected address.
>  */
> #define __fix_address noinline __noclone

You need something on the function *declaration* as well, to inhibit
sibcalls.

Thanks,
Florian