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This patch adds the sock version of kmemdup() helper, named sock_kmemdup(), to duplicate the input "src" memory block using the socket's option memory buffer. Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/f828077394c7d1f3560123497348b438c875b510.1740735165.git.tanggeliang@kylinos.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org>