netdev - Re: [PATCH net-next v3] net: skb: prevent the split of kfree_skb

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Message-ID: <CANiq72=01dzC5zs6-7Y4qrKYoFE1JpKes0ykN+x=FgGSmt9PCg@mail.gmail.com>
Date:   Mon, 15 Aug 2022 13:52:30 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     menglong8.dong@...il.com
Cc:     kuba@...nel.org, ojeda@...nel.org, ndesaulniers@...gle.com,
        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>
Subject: Re: [PATCH net-next v3] net: skb: prevent the split of
 kfree_skb_reason() by gcc

On Mon, Aug 15, 2022 at 8:27 AM <menglong8.dong@...il.com> wrote:
>
>  include/linux/compiler-gcc.h   | 12 ++++++++++++
>  include/linux/compiler_types.h |  4 ++++

No, this should be in `compiler_attributes.h` like you had it before.

To be clear, what you did here would be fine, but it is the "old way"
(we added `compiler_attributes.h` to reduce the complexity of
`compiler-*` and `compiler_types.h` and make it a bit more
normalized).

Please take a moment and read how other attributes do it in
`compiler_attributes.h` with `__has_attribute`. Check, for instance,
`__copy`, which is very similar to your case (not supported by Clang
and ICC, except in your case GCC always supports at least since 5.1).

Cheers,
Miguel