netdev - build failure: undef ref to __sk_defer_free

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Message-ID: <YelIBI/yG7gzy0Sf@angband.pl>
Date:   Thu, 20 Jan 2022 12:31:16 +0100
From:   Adam Borowski <kilobyte@...band.pl>
To:     Gal Pressman <gal@...dia.com>
Cc:     netdev@...r.kernel.org
Subject: build failure: undef ref to __sk_defer_free_flush

Hi!
Your commit 79074a72d335dbd021a716d8cc65cba3b2f706ab
     net: Flush deferred skb free on socket destroy
causes a build failure if NET=y && INET=n

  LD      .tmp_vmlinux.kallsyms1
ld: net/core/sock.o: in function `sk_defer_free_flush':
/home/kilobyte/linux/./include/net/tcp.h:1378: undefined reference to `__sk_defer_free_flush'


Meow!
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