uapi/if_ether.h: prevent redefinition of struct ethhdr
BugLink: https://bugs.launchpad.net/bugs/1818813 commit 6926e041 upstream. Musl provides its own ethhdr struct definition. Add a guard to prevent its definition of the appropriate musl header has already been included. glibc does not implement this header, but when glibc will implement this they can just define __UAPI_DEF_ETHHDR 0 to make it work with the kernel. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Juerg Haefliger <juergh@canonical.com> Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
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