On Mon, Sep 14, 2020 at 3:32 PM Yonghong Song <yhs@xxxxxx> wrote:
>
> When syncing latest libbpf repo to bcc, ubuntu 16.04 (4.4.0 LTS kernel)
> failed compilation for xsk.c:
> In file included from /tmp/debuild.0jkauG/bcc/src/cc/libbpf/src/xsk.c:23:0:
> /tmp/debuild.0jkauG/bcc/src/cc/libbpf/src/xsk.c: In function ‘xsk_get_ctx’:
> /tmp/debuild.0jkauG/bcc/src/cc/libbpf/include/linux/list.h:81:9: warning: implicit
> declaration of function ‘container_of’ [-Wimplicit-function-declaration]
> container_of(ptr, type, member)
> ^
> /tmp/debuild.0jkauG/bcc/src/cc/libbpf/include/linux/list.h:83:9: note: in expansion
> of macro ‘list_entry’
> list_entry((ptr)->next, type, member)
> ...
> src/cc/CMakeFiles/bpf-static.dir/build.make:209: recipe for target
> 'src/cc/CMakeFiles/bpf-static.dir/libbpf/src/xsk.c.o' failed
>
> Commit 2f6324a3937f ("libbpf: Support shared umems between queues and devices")
> added include file <linux/list.h>, which uses macro "container_of".
> xsk.c file also includes <linux/ethtool.h> before <linux/list.h>.
>
> In a more recent distro kernel, <linux/ethtool.h> includes <linux/kernel.h>
> which contains the macro definition for "container_of". So compilation is all fine.
> But in ubuntu 16.04 kernel, <linux/ethtool.h> does not contain <linux/kernel.h>
> which caused the above compilation error.
>
> Let explicitly add <linux/kernel.h> in xsk.c to avoid compilation error
> in old distro's.
>
> Fixes: 2f6324a3937f ("libbpf: Support shared umems between queues and devices")
> Signed-off-by: Yonghong Song <yhs@xxxxxx>
> ---
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
> tools/lib/bpf/xsk.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
> index 49c324594792..30b4ca5d2ac7 100644
> --- a/tools/lib/bpf/xsk.c
> +++ b/tools/lib/bpf/xsk.c
> @@ -20,6 +20,7 @@
> #include <linux/if_ether.h>
> #include <linux/if_packet.h>
> #include <linux/if_xdp.h>
> +#include <linux/kernel.h>
> #include <linux/list.h>
> #include <linux/sockios.h>
> #include <net/if.h>
> --
> 2.24.1
>
