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[ Upstream commit22bbc1dcd0] If a userspace application just include <linux/vm_sockets.h> will fail to build with the following errors: /usr/include/linux/vm_sockets.h:182:39: error: invalid application of ‘sizeof’ to incomplete type ‘struct sockaddr’ 182 | unsigned char svm_zero[sizeof(struct sockaddr) - | ^~~~~~ /usr/include/linux/vm_sockets.h:183:39: error: ‘sa_family_t’ undeclared here (not in a function) 183 | sizeof(sa_family_t) - | Include <sys/socket.h> for userspace (guarded by ifndef __KERNEL__) where `struct sockaddr` and `sa_family_t` are defined. We already do something similar in <linux/mptcp.h> and <linux/if.h>. Fixes:d021c34405("VSOCK: Introduce VM Sockets") Reported-by: Daan De Meyer <daan.j.demeyer@gmail.com> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Link: https://patch.msgid.link/20250623100053.40979-1-sgarzare@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>