add includes masked by cgroup -> bpf dependency

cgroup pulls in BPF which pulls in a lot of includes.
We're about to break that chain so fix those who were
depending on it.
Signed-off-by: NJakub Kicinski <kuba@kernel.org>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211216025538.1649516-2-kuba@kernel.org

arch/s390/mm/hugetlbpage.c

@@ -9,6 +9,7 @@
 #define KMSG_COMPONENT "hugetlb"
 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 
+#include <asm/pgalloc.h>
 #include <linux/mm.h>
 #include <linux/hugetlb.h>
 #include <linux/mman.h>

include/linux/perf_event.h

@@ -611,6 +611,7 @@ struct swevent_hlist {
 #define PERF_ATTACH_SCHED_CB	0x20
 #define PERF_ATTACH_CHILD	0x40
 
+struct bpf_prog;
 struct perf_cgroup;
 struct perf_buffer;