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Date:   Fri, 11 Feb 2022 09:24:30 -0800
From:   Eric Dumazet <>
To:     Ricardo Ribalda <>
Cc:     "David S. Miller" <>,
        Jakub Kicinski <>,
        Hideaki YOSHIFUJI <>,
        David Ahern <>,
        netdev <>,
        LKML <>
Subject: Re: [PATCH] net: Fix build when CONFIG_INET is not enabled

On Fri, Feb 11, 2022 at 8:40 AM Ricardo Ribalda <> wrote:
> If the kernel is configured with CONFIG_NET, but without CONFIG_INET we
> get the following error when building:
> sock.c:(.text+0x4c17): undefined reference to `__sk_defer_free_flush'
> Lets move __sk_defer_free_flush to sock.c

deja vu ?

commit 48cec899e357cfb92d022a9c0df6bbe72a7f6951
Author: Gal Pressman <>
Date:   Thu Jan 20 14:34:40 2022 +0200

    tcp: Add a stub for sk_defer_free_flush()

    When compiling the kernel with CONFIG_INET disabled, the
    sk_defer_free_flush() should be defined as a nop.

    This resolves the following compilation error:
      ld: net/core/sock.o: in function `sk_defer_free_flush':
      ./include/net/tcp.h:1378: undefined reference to `__sk_defer_free_flush'

    Fixes: 79074a72d335 ("net: Flush deferred skb free on socket destroy")
    Reported-by: kernel test robot <>
    Reviewed-by: Tariq Toukan <>
    Signed-off-by: Gal Pressman <>
    Reviewed-by: Eric Dumazet <>
    Signed-off-by: Jakub Kicinski <>

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