selftests/bpf: fix lots of silly mistakes pointed out by compiler

Once we enable -Wall for BPF sources, compiler will complain about lots
of unused variables, variables that are set but never read, etc.

Fix all these issues first before enabling -Wall in Makefile.

Signed-off-by: Andrii Nakryiko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/progs/bpf_iter_ksym.c

···
 	__u32 seq_num = ctx->meta->seq_num;
 	unsigned long value;
 	char type;
-	int ret;
 
 	if (!iter)
 		return 0;

tools/testing/selftests/bpf/progs/bpf_iter_setsockopt.c

···
 	char cur_cc[TCP_CA_NAME_MAX];
 	struct tcp_sock *tp;
 	struct sock *sk;
-	int ret;
 
 	if (!bpf_tcp_sk(ctx->sk_common))
 		return 0;

tools/testing/selftests/bpf/progs/bpf_loop.c

···
 SEC("fentry/" SYS_PREFIX "sys_nanosleep")
 int prog_non_constant_callback(void *ctx)
 {
-	struct callback_ctx data = {};
-
 	if (bpf_get_current_pid_tgid() >> 32 != pid)
 		return 0;
 

tools/testing/selftests/bpf/progs/cb_refs.c

···
 {
 	struct prog_test_ref_kfunc *p;
 	struct map_value *v;
-	unsigned long sl;
 
 	v = bpf_map_lookup_elem(&array_map, &(int){0});
 	if (!v)

tools/testing/selftests/bpf/progs/cgroup_skb_sk_lookup_kern.c

···
 SEC("cgroup_skb/ingress")
 int ingress_lookup(struct __sk_buff *skb)
 {
-	__u32 serv_port_key = 0;
 	struct ipv6hdr ip6h;
 	struct tcphdr tcph;
 

tools/testing/selftests/bpf/progs/cgrp_kfunc_failure.c

···
 	acquired = bpf_cgroup_acquire(cgrp);
 
 	/* Acquired cgroup is never released. */
+	__sink(acquired);
 
 	return 0;
 }

tools/testing/selftests/bpf/progs/cgrp_ls_attach_cgroup.c

···
 	     struct sockaddr *uaddr, int addr_len, int flags)
 {
 	struct socket_cookie *p;
-	struct tcp_sock *tcp_sk;
 
 	if (uaddr->sa_family != AF_INET6)
 		return 0;

tools/testing/selftests/bpf/progs/cgrp_ls_sleepable.c

···
 SEC("?iter.s/cgroup")
 int cgroup_iter(struct bpf_iter__cgroup *ctx)
 {
-	struct seq_file *seq = ctx->meta->seq;
 	struct cgroup *cgrp = ctx->cgroup;
 	long *ptr;
 

tools/testing/selftests/bpf/progs/core_kern.c

···
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data = (void *)(long)ctx->data;
 	void *ptr;
-	int ret = 0, nh_off, i = 0;
+	int nh_off, i = 0;
 
 	nh_off = 14;
 

tools/testing/selftests/bpf/progs/cpumask_failure.c

···
 	struct bpf_cpumask *cpumask;
 
 	cpumask = create_cpumask();
+	__sink(cpumask);
 
 	/* cpumask is never released. */
 	return 0;
···
 
 	/* Can't acquire a non-struct bpf_cpumask. */
 	cpumask = bpf_cpumask_acquire((struct bpf_cpumask *)task->cpus_ptr);
+	__sink(cpumask);
 
 	return 0;
 }
···
 
 	/* Can't set the CPU of a non-struct bpf_cpumask. */
 	bpf_cpumask_set_cpu(0, (struct bpf_cpumask *)task->cpus_ptr);
+	__sink(cpumask);
 
 	return 0;
 }

tools/testing/selftests/bpf/progs/cpumask_success.c

···
 int BPF_PROG(test_insert_leave, struct task_struct *task, u64 clone_flags)
 {
 	struct bpf_cpumask *cpumask;
-	struct __cpumask_map_value *v;
 
 	cpumask = create_cpumask();
 	if (!cpumask)

tools/testing/selftests/bpf/progs/dynptr_fail.c

···
 __failure __msg("value is outside of the allowed memory range")
 int data_slice_out_of_bounds_map_value(void *ctx)
 {
-	__u32 key = 0, map_val;
+	__u32 map_val;
 	struct bpf_dynptr ptr;
 	void *data;
 
···
 		/* this should fail */
 		*data2 = 3;
 
-done:
 	bpf_ringbuf_discard_dynptr(&ptr, 0);
 	return 0;
 }
···
 
 	/* this should fail */
 	data = bpf_dynptr_data(&ptr, 0, 1);
+	__sink(data);
 
 	return 0;
 }
···
 	 * changing packet data
 	 */
 	hdr = bpf_dynptr_slice_rdwr(&ptr, 0, buffer, sizeof(buffer));
+	__sink(hdr);
 
 	return 0;
 }

tools/testing/selftests/bpf/progs/dynptr_success.c

···
 int test_read_write(void *ctx)
 {
 	char write_data[64] = "hello there, world!!";
-	char read_data[64] = {}, buf[64] = {};
+	char read_data[64] = {};
 	struct bpf_dynptr ptr;
 	int i;
 
···
 {
 	__u8 write_data[2] = {1, 2};
 	struct bpf_dynptr ptr;
-	__u64 *data;
 	int ret;
 
 	if (bpf_dynptr_from_skb(skb, 0, &ptr)) {
···
 SEC("?cgroup_skb/egress")
 int test_dynptr_skb_data(struct __sk_buff *skb)
 {
-	__u8 write_data[2] = {1, 2};
 	struct bpf_dynptr ptr;
 	__u64 *data;
-	int ret;
 
 	if (bpf_dynptr_from_skb(skb, 0, &ptr)) {
 		err = 1;

tools/testing/selftests/bpf/progs/fexit_bpf2bpf.c

···
 	void *data = (void *)(long)skb->data;
 	struct ipv6hdr ip6, *ip6p;
 	int ifindex = skb->ifindex;
-	__u32 eth_proto;
-	__u32 nh_off;
 
 	/* check that BPF extension can read packet via direct packet access */
 	if (data + 14 + sizeof(ip6) > data_end)

tools/testing/selftests/bpf/progs/freplace_attach_probe.c

···
 SEC("freplace/handle_kprobe")
 int new_handle_kprobe(struct pt_regs *ctx)
 {
-	struct hmap_elem zero = {}, *val;
+	struct hmap_elem *val;
 	int key = 0;
 
 	val = bpf_map_lookup_elem(&hash_map, &key);

tools/testing/selftests/bpf/progs/iters.c

···
 int iter_err_unsafe_asm_loop(const void *ctx)
 {
 	struct bpf_iter_num it;
-	int *v, i = 0;
 
 	MY_PID_GUARD();
 
···
 int iter_while_loop(const void *ctx)
 {
 	struct bpf_iter_num it;
-	int *v, i;
+	int *v;
 
 	MY_PID_GUARD();
 
···
 int iter_while_loop_auto_cleanup(const void *ctx)
 {
 	__attribute__((cleanup(bpf_iter_num_destroy))) struct bpf_iter_num it;
-	int *v, i;
+	int *v;
 
 	MY_PID_GUARD();
 
···
 int iter_for_loop(const void *ctx)
 {
 	struct bpf_iter_num it;
-	int *v, i;
+	int *v;
 
 	MY_PID_GUARD();
 
···
 int iter_manual_unroll_loop(const void *ctx)
 {
 	struct bpf_iter_num it;
-	int *v, i;
+	int *v;
 
 	MY_PID_GUARD();
 
···
 int iter_stack_array_loop(const void *ctx)
 {
 	long arr1[16], arr2[16], sum = 0;
-	int *v, i;
+	int i;
 
 	MY_PID_GUARD();
 

tools/testing/selftests/bpf/progs/linked_funcs1.c

···
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>
+#include "bpf_misc.h"
 
 /* weak and shared between two files */
 const volatile int my_tid __weak;
···
 	 * cause problems for BPF static linker
 	 */
 	whatever = bpf_core_type_size(struct task_struct);
+	__sink(whatever);
 
 	output_weak1 = x;
 	return x;
···
 
 	/* make sure we have CO-RE relocations in main program */
 	whatever = bpf_core_type_size(struct task_struct);
+	__sink(whatever);
 
 	set_output_val2(1000);
 	set_output_ctx2(ctx); /* ctx definition is hidden in BPF_PROG macro */

tools/testing/selftests/bpf/progs/linked_funcs2.c

···
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 #include <bpf/bpf_core_read.h>
+#include "bpf_misc.h"
 
 /* weak and shared between both files */
 const volatile int my_tid __weak;
···
 	 * cause problems for BPF static linker
 	 */
 	whatever = 2 * bpf_core_type_size(struct task_struct);
+	__sink(whatever);
 
 	output_weak2 = x;
 	return 2 * x;
···
 
 	/* make sure we have CO-RE relocations in main program */
 	whatever = bpf_core_type_size(struct task_struct);
+	__sink(whatever);
 
 	set_output_val1(2000);
 	set_output_ctx1(ctx); /* ctx definition is hidden in BPF_PROG macro */

tools/testing/selftests/bpf/progs/linked_list.c

···
 int map_list_push_pop_multiple(void *ctx)
 {
 	struct map_value *v;
-	int ret;
 
 	v = bpf_map_lookup_elem(&array_map, &(int){0});
 	if (!v)
···
 {
 	struct map_value *v;
 	void *map;
-	int ret;
 
 	map = bpf_map_lookup_elem(&map_of_maps, &(int){0});
 	if (!map)
···
 int map_list_in_list(void *ctx)
 {
 	struct map_value *v;
-	int ret;
 
 	v = bpf_map_lookup_elem(&array_map, &(int){0});
 	if (!v)
···
 {
 	struct map_value *v;
 	void *map;
-	int ret;
 
 	map = bpf_map_lookup_elem(&map_of_maps, &(int){0});
 	if (!map)

tools/testing/selftests/bpf/progs/linked_list_fail.c

···
 int incorrect_head_off2(void *ctx)
 {
 	struct foo *f;
-	struct bar *b;
 
 	f = bpf_obj_new(typeof(*f));
 	if (!f)

tools/testing/selftests/bpf/progs/local_storage.c

···
 	     struct inode *new_dir, struct dentry *new_dentry,
 	     unsigned int flags)
 {
-	__u32 pid = bpf_get_current_pid_tgid() >> 32;
 	struct local_storage *storage;
 	int err;
 

tools/testing/selftests/bpf/progs/map_kptr.c

···
 {
 	struct task_struct *current;
 	struct map_value *v;
-	int ret;
 
 	current = bpf_get_current_task_btf();
 	if (!current)
···
 {
 	struct task_struct *current;
 	struct map_value *v;
-	int ret;
 
 	current = bpf_get_current_task_btf();
 	if (!current)
···
 {
 	struct task_struct *current;
 	struct map_value *v;
-	int ret;
 
 	current = bpf_get_current_task_btf();
 	if (!current)

tools/testing/selftests/bpf/progs/netcnt_prog.c

···
 int bpf_nextcnt(struct __sk_buff *skb)
 {
 	union percpu_net_cnt *percpu_cnt;
-	char fmt[] = "%d %llu %llu\n";
 	union net_cnt *cnt;
 	__u64 ts, dt;
 	int ret;

tools/testing/selftests/bpf/progs/netif_receive_skb.c

···
 	do {								\
 		static const char _expectedval[EXPECTED_STRSIZE] =	\
 							_expected;	\
-		static const char _ptrtype[64] = #_type;		\
 		__u64 _hflags = _flags | BTF_F_COMPACT;			\
 		static _type _ptrdata = __VA_ARGS__;			\
 		static struct btf_ptr _ptr = { };			\

tools/testing/selftests/bpf/progs/perfbuf_bench.c

···
 SEC("fentry/" SYS_PREFIX "sys_getpgid")
 int bench_perfbuf(void *ctx)
 {
-	__u64 *sample;
 	int i;
 
 	for (i = 0; i < batch_cnt; i++) {

tools/testing/selftests/bpf/progs/pyperf.h

···
 SEC("raw_tracepoint/kfree_skb")
 int on_event(struct bpf_raw_tracepoint_args* ctx)
 {
-	int i, ret = 0;
+	int ret = 0;
 	ret |= __on_event(ctx);
 	ret |= __on_event(ctx);
 	ret |= __on_event(ctx);

tools/testing/selftests/bpf/progs/rbtree_btf_fail__wrong_node_type.c

···
 	struct bpf_list_node node;
 };
 
-static bool less(struct bpf_rb_node *a, const struct bpf_rb_node *b)
-{
-	struct node_data *node_a;
-	struct node_data *node_b;
-
-	node_a = container_of(a, struct node_data, node);
-	node_b = container_of(b, struct node_data, node);
-
-	return node_a->key < node_b->key;
-}
-
 #define private(name) SEC(".data." #name) __hidden __attribute__((aligned(8)))
 private(A) struct bpf_spin_lock glock;
 private(A) struct bpf_rb_root groot __contains(node_data, node);

tools/testing/selftests/bpf/progs/rbtree_fail.c

···
 }
 
 SEC("?tc")
-__failure __msg("Unreleased reference id=2 alloc_insn=11")
+__failure __msg("Unreleased reference id=2 alloc_insn=10")
 long rbtree_api_remove_no_drop(void *ctx)
 {
 	struct bpf_rb_node *res;
···
 	res = bpf_rbtree_remove(&groot, res);
 
 	n = container_of(res, struct node_data, node);
+	__sink(n);
 	bpf_spin_unlock(&glock);
 
 	/* bpf_obj_drop(n) is missing here */

tools/testing/selftests/bpf/progs/rcu_read_lock.c

···
 int miss_lock(void *ctx)
 {
 	struct task_struct *task;
-	struct css_set *cgroups;
-	struct cgroup *dfl_cgrp;
 
 	/* missing bpf_rcu_read_lock() */
 	task = bpf_get_current_task_btf();
···
 int miss_unlock(void *ctx)
 {
 	struct task_struct *task;
-	struct css_set *cgroups;
-	struct cgroup *dfl_cgrp;
 
 	/* missing bpf_rcu_read_unlock() */
 	task = bpf_get_current_task_btf();

tools/testing/selftests/bpf/progs/read_bpf_task_storage_busy.c

···
 int BPF_PROG(read_bpf_task_storage_busy)
 {
 	int *value;
-	int key;
 
 	if (!CONFIG_PREEMPT)
 		return 0;

tools/testing/selftests/bpf/progs/recvmsg4_prog.c

···
 int recvmsg4_prog(struct bpf_sock_addr *ctx)
 {
 	struct bpf_sock *sk;
-	__u32 user_ip4;
-	__u16 user_port;
 
 	sk = ctx->sk;
 	if (!sk)

tools/testing/selftests/bpf/progs/recvmsg6_prog.c

···
 int recvmsg6_prog(struct bpf_sock_addr *ctx)
 {
 	struct bpf_sock *sk;
-	__u32 user_ip4;
-	__u16 user_port;
 
 	sk = ctx->sk;
 	if (!sk)

tools/testing/selftests/bpf/progs/sendmsg4_prog.c

···
 SEC("cgroup/sendmsg4")
 int sendmsg_v4_prog(struct bpf_sock_addr *ctx)
 {
-	int prio;
-
 	if (ctx->type != SOCK_DGRAM)
 		return 0;
 

tools/testing/selftests/bpf/progs/sockmap_verdict_prog.c

···
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_misc.h"
 
 struct {
 	__uint(type, BPF_MAP_TYPE_SOCKMAP);
···
 	__u32 rport = skb->remote_port;
 	__u8 *d = data;
 	__u8 sk, map;
+
+	__sink(lport);
+	__sink(rport);
 
 	if (data + 8 > data_end)
 		return SK_DROP;

tools/testing/selftests/bpf/progs/strobemeta.h

···
 	struct strobe_map_raw map;
 	void *location;
 	uint64_t len;
-	int i;
 
 	descr->tag_len = 0; /* presume no tag is set */
 	descr->cnt = -1; /* presume no value is set */

tools/testing/selftests/bpf/progs/tailcall_bpf2bpf3.c

···
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
 #include "bpf_legacy.h"
+#include "bpf_misc.h"
 
 struct {
 	__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
···
 	else
 		bpf_tail_call_static(skb, &jmp_table, 1);
 
+	__sink(arr[sizeof(arr) - 1]);
+
 	return skb->len;
 }
 
···
 
 	bpf_tail_call_static(skb, &jmp_table, 0);
 
+	__sink(arr[sizeof(arr) - 1]);
+
 	return skb->len * 2;
 }
 
···
 int classifier_0(struct __sk_buff *skb)
 {
 	volatile char arr[128] = {};
+
+	__sink(arr[sizeof(arr) - 1]);
 
 	return subprog_tail2(skb);
 }
···
 {
 	volatile char arr[128] = {};
 
+	__sink(arr[sizeof(arr) - 1]);
+
 	return skb->len * 3;
 }
 
···
 int entry(struct __sk_buff *skb)
 {
 	volatile char arr[128] = {};
+
+	__sink(arr[sizeof(arr) - 1]);
 
 	return subprog_tail(skb);
 }

tools/testing/selftests/bpf/progs/tailcall_bpf2bpf6.c

···
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
 
 #define __unused __attribute__((unused))
 
···
 {
 	/* Have data on stack which size is not a multiple of 8 */
 	volatile char arr[1] = {};
+
+	__sink(arr[0]);
 
 	return subprog_tail(skb);
 }

tools/testing/selftests/bpf/progs/task_kfunc_failure.c

···
 	acquired = bpf_task_acquire(task);
 
 	/* Acquired task is never released. */
+	__sink(acquired);
 
 	return 0;
 }

tools/testing/selftests/bpf/progs/task_kfunc_success.c

···
 SEC("tp_btf/task_newtask")
 int BPF_PROG(test_task_from_pid_arg, struct task_struct *task, u64 clone_flags)
 {
-	struct task_struct *acquired;
-
 	if (!is_test_kfunc_task())
 		return 0;
 
···
 SEC("tp_btf/task_newtask")
 int BPF_PROG(test_task_from_pid_current, struct task_struct *task, u64 clone_flags)
 {
-	struct task_struct *current, *acquired;
-
 	if (!is_test_kfunc_task())
 		return 0;
 
···
 SEC("tp_btf/task_newtask")
 int BPF_PROG(test_task_from_pid_invalid, struct task_struct *task, u64 clone_flags)
 {
-	struct task_struct *acquired;
-
 	if (!is_test_kfunc_task())
 		return 0;
 

tools/testing/selftests/bpf/progs/test_bpf_nf.c

···
 	struct bpf_ct_opts___local opts_def = { .l4proto = IPPROTO_TCP, .netns_id = -1 };
 	struct bpf_sock_tuple bpf_tuple;
 	struct nf_conn *ct;
-	int err;
 
 	__builtin_memset(&bpf_tuple, 0, sizeof(bpf_tuple.ipv4));
 

tools/testing/selftests/bpf/progs/test_cls_redirect_dynptr.c

···
 
 static ret_t skip_next_hops(__u64 *offset, int n)
 {
-	__u32 res;
 	switch (n) {
 	case 1:
 		*offset += sizeof(struct in_addr);

tools/testing/selftests/bpf/progs/test_core_reloc_bitfields_probed.c

···
 {
 	struct core_reloc_bitfields *in = (void *)&data.in;
 	struct core_reloc_bitfields_output *out = (void *)&data.out;
-	uint64_t res;
 
 	out->ub1 = BPF_CORE_READ_BITFIELD_PROBED(in, ub1);
 	out->ub2 = BPF_CORE_READ_BITFIELD_PROBED(in, ub2);

tools/testing/selftests/bpf/progs/test_global_func1.c

···
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return f0(0, skb) + skb->len;
 }
 
···
 int f3(int val, struct __sk_buff *skb, int var)
 {
 	volatile char buf[MAX_STACK] = {};
+
+	__sink(buf[MAX_STACK - 1]);
 
 	return skb->ifindex * val * var;
 }

tools/testing/selftests/bpf/progs/test_global_func2.c

···
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return f0(0, skb) + skb->len;
 }
 
···
 int f3(int val, struct __sk_buff *skb, int var)
 {
 	volatile char buf[MAX_STACK] = {};
+
+	__sink(buf[MAX_STACK - 1]);
 
 	return skb->ifindex * val * var;
 }

tools/testing/selftests/bpf/progs/test_hash_large_key.c

···
 SEC("raw_tracepoint/sys_enter")
 int bpf_hash_large_key_test(void *ctx)
 {
-	int zero = 0, err = 1, value = 42;
+	int zero = 0, value = 42;
 	struct bigelement *key;
 
 	key = bpf_map_lookup_elem(&key_map, &zero);

tools/testing/selftests/bpf/progs/test_ksyms_btf_write_check.c

···
 int handler2(const void *ctx)
 {
 	int *active;
-	__u32 cpu;
 
 	active = bpf_this_cpu_ptr(&bpf_prog_active);
 	write_active(active);

tools/testing/selftests/bpf/progs/test_legacy_printk.c

···
 SEC("tp/raw_syscalls/sys_enter")
 int handle_modern(void *ctx)
 {
-	int zero = 0, cur_pid;
+	int cur_pid;
 
 	cur_pid = bpf_get_current_pid_tgid() >> 32;
 	if (cur_pid != my_pid_var)

tools/testing/selftests/bpf/progs/test_map_lock.c

···
 SEC("cgroup/skb")
 int bpf_map_lock_test(struct __sk_buff *skb)
 {
-	struct hmap_elem zero = {}, *val;
+	struct hmap_elem *val;
 	int rnd = bpf_get_prandom_u32();
 	int key = 0, err = 1, i;
 	struct array_elem *q;

tools/testing/selftests/bpf/progs/test_obj_id.c

···
 #include <stddef.h>
 #include <linux/bpf.h>
 #include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
 
 struct {
 	__uint(type, BPF_MAP_TYPE_ARRAY);
···
 	__u64 *value;
 
 	value = bpf_map_lookup_elem(&test_map_id, &key);
+	__sink(value);
 
 	return 0;
 }

tools/testing/selftests/bpf/progs/test_parse_tcp_hdr_opt.c

···
 	__u8 tcp_hdr_opt_len = 0;
 	struct tcphdr *tcp_hdr;
 	__u64 tcp_offset = 0;
-	__u32 off;
 	int err;
 
 	tcp_offset = sizeof(struct ethhdr) + sizeof(struct ipv6hdr);

tools/testing/selftests/bpf/progs/test_parse_tcp_hdr_opt_dynptr.c

···
 static int parse_hdr_opt(struct bpf_dynptr *ptr, __u32 *off, __u8 *hdr_bytes_remaining,
 			 __u32 *server_id)
 {
-	__u8 *tcp_opt, kind, hdr_len;
+	__u8 kind, hdr_len;
 	__u8 buffer[sizeof(kind) + sizeof(hdr_len) + sizeof(*server_id)];
 	__u8 *data;
 

tools/testing/selftests/bpf/progs/test_pkt_access.c

···
 #include <linux/pkt_cls.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_misc.h"
 
 /* llvm will optimize both subprograms into exactly the same BPF assembly
  *
···
 {
 	volatile char buf[MAX_STACK] = {};
 
+	__sink(buf[MAX_STACK - 1]);
+
 	return skb->len;
 }
 
···
 int get_skb_ifindex(int val, struct __sk_buff *skb, int var)
 {
 	volatile char buf[MAX_STACK] = {};
+
+	__sink(buf[MAX_STACK - 1]);
 
 	return skb->ifindex * val * var;
 }

tools/testing/selftests/bpf/progs/test_ringbuf.c

···
 {
 	int cur_pid = bpf_get_current_pid_tgid() >> 32;
 	struct sample *sample;
-	int zero = 0;
 
 	if (cur_pid != pid)
 		return 0;

tools/testing/selftests/bpf/progs/test_ringbuf_map_key.c

···
 	/* test using 'sample' (PTR_TO_MEM | MEM_ALLOC) as map key arg
 	 */
 	lookup_val = (int *)bpf_map_lookup_elem(&hash_map, sample);
+	__sink(lookup_val);
 
 	/* workaround - memcpy is necessary so that verifier doesn't
 	 * complain with:

tools/testing/selftests/bpf/progs/test_ringbuf_multi.c

···
 	int cur_pid = bpf_get_current_pid_tgid() >> 32;
 	struct sample *sample;
 	void *rb;
-	int zero = 0;
 
 	if (cur_pid != pid)
 		return 0;

tools/testing/selftests/bpf/progs/test_select_reuseport_kern.c

···
 int _select_by_skb_data(struct sk_reuseport_md *reuse_md)
 {
 	__u32 linum, index = 0, flags = 0, index_zero = 0;
-	__u32 *result_cnt, *linum_value;
+	__u32 *result_cnt;
 	struct data_check data_check = {};
 	struct cmd *cmd, cmd_copy;
 	void *data, *data_end;

tools/testing/selftests/bpf/progs/test_sk_assign.c

···
 #include <sys/socket.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_misc.h"
 
 #if defined(IPROUTE2_HAVE_LIBBPF)
 /* Use a new-style map definition. */
···
 	void *data = (void *)(long)skb->data;
 	struct bpf_sock_tuple *result;
 	struct ethhdr *eth;
-	__u64 tuple_len;
 	__u8 proto = 0;
 	__u64 ihl_len;
 
···
 		return NULL;
 
 	*tcp = (proto == IPPROTO_TCP);
+	__sink(ihl_len);
 	return result;
 }
 
···
 	struct bpf_sock_tuple *tuple;
 	bool ipv4 = false;
 	bool tcp = false;
-	int tuple_len;
 	int ret = 0;
 
 	tuple = get_tuple(skb, &ipv4, &tcp);

tools/testing/selftests/bpf/progs/test_sk_lookup.c

···
 int ctx_narrow_access(struct bpf_sk_lookup *ctx)
 {
 	struct bpf_sock *sk;
-	int err, family;
 	__u32 val_u32;
 	bool v4;
 
···
 SEC("sk_lookup")
 int multi_prog_redir1(struct bpf_sk_lookup *ctx)
 {
-	int ret;
-
-	ret = select_server_a(ctx);
+	(void)select_server_a(ctx);
 	bpf_map_update_elem(&run_map, &KEY_PROG1, &PROG_DONE, BPF_ANY);
 	return SK_PASS;
 }
···
 SEC("sk_lookup")
 int multi_prog_redir2(struct bpf_sk_lookup *ctx)
 {
-	int ret;
-
-	ret = select_server_a(ctx);
+	(void)select_server_a(ctx);
 	bpf_map_update_elem(&run_map, &KEY_PROG2, &PROG_DONE, BPF_ANY);
 	return SK_PASS;
 }

tools/testing/selftests/bpf/progs/test_sk_lookup_kern.c

···
 {
 	struct bpf_sock_tuple tuple = {};
 	struct bpf_sock *sk;
-	__u32 family;
 
 	sk = bpf_sk_lookup_tcp(skb, &tuple, sizeof(tuple), BPF_F_CURRENT_NETNS, 0);
 	if (sk) {
···
 {
 	struct bpf_sock_tuple tuple = {};
 	struct bpf_sock *sk;
-	__u32 family;
 
 	sk = bpf_sk_lookup_tcp(skb, &tuple, sizeof(tuple), BPF_F_CURRENT_NETNS, 0);
 	sk += 1;

tools/testing/selftests/bpf/progs/test_sock_fields.c

···
 SEC("cgroup_skb/egress")
 int egress_read_sock_fields(struct __sk_buff *skb)
 {
-	struct bpf_spinlock_cnt cli_cnt_init = { .lock = 0, .cnt = 0xeB9F };
+	struct bpf_spinlock_cnt cli_cnt_init = { .lock = {}, .cnt = 0xeB9F };
 	struct bpf_spinlock_cnt *pkt_out_cnt, *pkt_out_cnt10;
 	struct bpf_tcp_sock *tp, *tp_ret;
 	struct bpf_sock *sk, *sk_ret;

tools/testing/selftests/bpf/progs/test_sockmap_kern.h

···
 #include <sys/socket.h>
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_endian.h>
+#include "bpf_misc.h"
 
 /* Sockmap sample program connects a client and a backend together
  * using cgroups.
···
 	int len, *f, ret, zero = 0;
 	__u64 flags = 0;
 
+	__sink(rport);
 	if (lport == 10000)
 		ret = 10;
 	else
 		ret = 1;
 
 	len = (__u32)skb->data_end - (__u32)skb->data;
+	__sink(len);
+
 	f = bpf_map_lookup_elem(&sock_skb_opts, &zero);
 	if (f && *f) {
 		ret = 3;
···
 	if (err)
 		return SK_DROP;
 	bpf_write_pass(skb, 13);
-tls_out:
 	return ret;
 }
 
···
 int bpf_sockmap(struct bpf_sock_ops *skops)
 {
 	__u32 lport, rport;
-	int op, err = 0, index, key, ret;
-
+	int op, err, ret;
 
 	op = (int) skops->op;
 
···
 	default:
 		break;
 	}
+
+	__sink(err);
 
 	return 0;
 }
···
 	} else {
 		return SK_DROP;
 	}
+
+	__sink(data_end);
+	__sink(data);
+
 	return SK_PASS;
 }
 SEC("sk_msg4")

tools/testing/selftests/bpf/progs/test_spin_lock.c

···
 #include <linux/bpf.h>
 #include <linux/version.h>
 #include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
 
 struct hmap_elem {
 	volatile int cnt;
···
 	q->credit -= pkt_len;
 	credit = q->credit;
 	bpf_spin_unlock(&q->lock);
+
+	__sink(credit);
 
 	/* spin_lock in cgroup local storage */
 	cls = bpf_get_local_storage(&cls_map, 0);

tools/testing/selftests/bpf/progs/test_tc_dtime.c

···
 		ip6h = data + sizeof(struct ethhdr);
 		if (ip6h + 1 > data_end)
 			return -1;
-		if (v6_equal(ip6h->saddr, (struct in6_addr)ip6_src))
+		if (v6_equal(ip6h->saddr, (struct in6_addr){{ip6_src}}))
 			ns = SRC_NS;
-		else if (v6_equal(ip6h->saddr, (struct in6_addr)ip6_dst))
+		else if (v6_equal(ip6h->saddr, (struct in6_addr){{ip6_dst}}))
 			ns = DST_NS;
 		inet_proto = ip6h->nexthdr;
 		trans = ip6h + 1;

tools/testing/selftests/bpf/progs/test_tc_neigh.c

···
 		redirect = is_remote_ep_v4(skb, __bpf_constant_htonl(ip4_src));
 		break;
 	case __bpf_constant_htons(ETH_P_IPV6):
-		redirect = is_remote_ep_v6(skb, (struct in6_addr)ip6_src);
+		redirect = is_remote_ep_v6(skb, (struct in6_addr){{ip6_src}});
 		break;
 	}
 
···
 		redirect = is_remote_ep_v4(skb, __bpf_constant_htonl(ip4_dst));
 		break;
 	case __bpf_constant_htons(ETH_P_IPV6):
-		redirect = is_remote_ep_v6(skb, (struct in6_addr)ip6_dst);
+		redirect = is_remote_ep_v6(skb, (struct in6_addr){{ip6_dst}});
 		break;
 	}
 

tools/testing/selftests/bpf/progs/test_tcpbpf_kern.c

···
 	struct bpf_sock_ops *reuse = skops;
 	struct tcphdr *thdr;
 	int window_clamp = 9216;
-	int good_call_rv = 0;
-	int bad_call_rv = 0;
 	int save_syn = 1;
 	int rv = -1;
 	int v = 0;

tools/testing/selftests/bpf/progs/test_tunnel_kern.c

···
 {
 	struct bpf_tunnel_key key;
 	struct erspan_metadata md;
-	__u32 index;
 	int ret;
 
 	ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0);
···
 {
 	struct bpf_tunnel_key key;
 	struct erspan_metadata md;
-	__u32 index;
 	int ret;
 
 	ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
···
 	int ret;
 	struct bpf_tunnel_key key;
 	struct vxlan_metadata md;
-	__u32 orig_daddr;
-	__u32 index = 0;
 
 	ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key),
 				     BPF_F_TUNINFO_FLAGS);
···
 	void *data_end = (void *)(long)skb->data_end;
 	struct udphdr *udph;
 	struct iphdr *iph;
-	__u32 index = 0;
 	int ret = 0;
-	int shrink;
 	__s64 csum;
 
 	if ((void *)eth + sizeof(*eth) > data_end) {

tools/testing/selftests/bpf/progs/test_usdt_multispec.c

···
 SEC("usdt//proc/self/exe:test:usdt_100")
 int BPF_USDT(usdt_100, int x)
 {
-	long tmp;
-
 	if (my_pid != (bpf_get_current_pid_tgid() >> 32))
 		return 0;
 

tools/testing/selftests/bpf/progs/test_verif_scale1.c

···
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data = (void *)(long)ctx->data;
 	void *ptr;
-	int ret = 0, nh_off, i = 0;
+	int nh_off, i = 0;
 
 	nh_off = 14;
 

tools/testing/selftests/bpf/progs/test_verif_scale2.c

···
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data = (void *)(long)ctx->data;
 	void *ptr;
-	int ret = 0, nh_off, i = 0;
+	int nh_off, i = 0;
 
 	nh_off = 14;
 

tools/testing/selftests/bpf/progs/test_verif_scale3.c

···
 	void *data_end = (void *)(long)ctx->data_end;
 	void *data = (void *)(long)ctx->data;
 	void *ptr;
-	int ret = 0, nh_off, i = 0;
+	int nh_off, i = 0;
 
 	nh_off = 32;
 

tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_grow.c

···
 SEC("xdp")
 int _xdp_adjust_tail_grow(struct xdp_md *xdp)
 {
-	void *data_end = (void *)(long)xdp->data_end;
-	void *data = (void *)(long)xdp->data;
 	int data_len = bpf_xdp_get_buff_len(xdp);
 	int offset = 0;
 	/* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */

tools/testing/selftests/bpf/progs/test_xdp_bpf2bpf.c

···
 int BPF_PROG(trace_on_entry, struct xdp_buff *xdp)
 {
 	struct meta meta;
-	void *data_end = (void *)(long)xdp->data_end;
-	void *data = (void *)(long)xdp->data;
 
 	meta.ifindex = xdp->rxq->dev->ifindex;
 	meta.pkt_len = bpf_xdp_get_buff_len((struct xdp_md *)xdp);

tools/testing/selftests/bpf/progs/test_xdp_dynptr.c

···
 	struct iptnl_info *tnl;
 	struct ethhdr *new_eth;
 	struct ethhdr *old_eth;
-	__u32 transport_hdr_sz;
 	struct iphdr *iph;
 	__u16 *next_iph;
 	__u16 payload_len;
···
 	struct iptnl_info *tnl;
 	struct ethhdr *new_eth;
 	struct ethhdr *old_eth;
-	__u32 transport_hdr_sz;
 	struct ipv6hdr *ip6h;
 	__u16 payload_len;
 	struct vip vip = {};

tools/testing/selftests/bpf/progs/test_xdp_noinline.c

···
 }
 
 static __attribute__ ((noinline))
-bool decap_v6(struct xdp_md *xdp, void **data, void **data_end, bool inner_v4)
-{
-	struct eth_hdr *new_eth;
-	struct eth_hdr *old_eth;
-
-	old_eth = *data;
-	new_eth = *data + sizeof(struct ipv6hdr);
-	memcpy(new_eth->eth_source, old_eth->eth_source, 6);
-	memcpy(new_eth->eth_dest, old_eth->eth_dest, 6);
-	if (inner_v4)
-		new_eth->eth_proto = 8;
-	else
-		new_eth->eth_proto = 56710;
-	if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct ipv6hdr)))
-		return false;
-	*data = (void *)(long)xdp->data;
-	*data_end = (void *)(long)xdp->data_end;
-	return true;
-}
-
-static __attribute__ ((noinline))
-bool decap_v4(struct xdp_md *xdp, void **data, void **data_end)
-{
-	struct eth_hdr *new_eth;
-	struct eth_hdr *old_eth;
-
-	old_eth = *data;
-	new_eth = *data + sizeof(struct iphdr);
-	memcpy(new_eth->eth_source, old_eth->eth_source, 6);
-	memcpy(new_eth->eth_dest, old_eth->eth_dest, 6);
-	new_eth->eth_proto = 8;
-	if (bpf_xdp_adjust_head(xdp, (int)sizeof(struct iphdr)))
-		return false;
-	*data = (void *)(long)xdp->data;
-	*data_end = (void *)(long)xdp->data_end;
-	return true;
-}
-
-static __attribute__ ((noinline))
 int swap_mac_and_send(void *data, void *data_end)
 {
 	unsigned char tmp_mac[6];
···
 	__u16 *next_iph_u16;
 	__u32 tmp_addr = 0;
 	struct iphdr *iph;
-	__u32 csum1 = 0;
 	__u32 csum = 0;
 	__u64 off = 0;
 
···
 				 void *data_end)
 {
 	struct iphdr *iph;
-	__u64 iph_len;
 	int action;
 
 	iph = data + off;
···
 	struct packet_description pckt = { };
 	struct vip_definition vip = { };
 	struct lb_stats *data_stats;
-	struct eth_hdr *eth = data;
 	void *lru_map = &lru_cache;
 	struct vip_meta *vip_info;
 	__u32 lru_stats_key = 513;
···
 	__u32 stats_key = 512;
 	struct ctl_value *cval;
 	__u16 pkt_bytes;
-	__u64 iph_len;
 	__u8 protocol;
 	__u32 vip_num;
 	int action;

tools/testing/selftests/bpf/progs/test_xdp_vlan.c

···
 }
 
 static __always_inline
-void shift_mac_4bytes_16bit(void *data)
-{
-	__u16 *p = data;
-
-	p[7] = p[5]; /* delete p[7] was vlan_hdr->h_vlan_TCI */
-	p[6] = p[4]; /* delete p[6] was ethhdr->h_proto */
-	p[5] = p[3];
-	p[4] = p[2];
-	p[3] = p[1];
-	p[2] = p[0];
-}
-
-static __always_inline
 void shift_mac_4bytes_32bit(void *data)
 {
 	__u32 *p = data;

tools/testing/selftests/bpf/progs/type_cast.c

···
 int BPF_PROG(untrusted_ptr, struct pt_regs *regs, long id)
 {
 	struct task_struct *task, *task_dup;
-	long *ptr;
 
 	task = bpf_get_current_task_btf();
 	task_dup = bpf_rdonly_cast(task, bpf_core_type_id_kernel(struct task_struct));

tools/testing/selftests/bpf/progs/udp_limit.c

···
 int sock(struct bpf_sock *ctx)
 {
 	int *sk_storage;
-	__u32 key;
 
 	if (ctx->type != SOCK_DGRAM)
 		return 1;
···
 int sock_release(struct bpf_sock *ctx)
 {
 	int *sk_storage;
-	__u32 key;
 
 	if (ctx->type != SOCK_DGRAM)
 		return 1;

tools/testing/selftests/bpf/progs/user_ringbuf_success.c

···
 int test_user_ringbuf_protocol(void *ctx)
 {
 	long status = 0;
-	struct sample *sample = NULL;
-	struct bpf_dynptr ptr;
 
 	if (!is_test_process())
 		return 0;
···
 SEC("fentry/" SYS_PREFIX "sys_getpgid")
 int test_user_ringbuf(void *ctx)
 {
-	int status = 0;
-	struct sample *sample = NULL;
-	struct bpf_dynptr ptr;
-
 	if (!is_test_process())
 		return 0;
 

tools/testing/selftests/bpf/progs/xdp_features.c

···
 	struct tlv_hdr *tlv;
 	struct udphdr *uh;
 	__be16 port;
-	__u8 *cmd;
 
 	if (eh + 1 > (struct ethhdr *)data_end)
 		return -EINVAL;

tools/testing/selftests/bpf/progs/xdping_kern.c

···
 SEC("xdp")
 int xdping_client(struct xdp_md *ctx)
 {
-	void *data_end = (void *)(long)ctx->data_end;
 	void *data = (void *)(long)ctx->data;
 	struct pinginfo *pinginfo = NULL;
 	struct ethhdr *eth = data;
···
 SEC("xdp")
 int xdping_server(struct xdp_md *ctx)
 {
-	void *data_end = (void *)(long)ctx->data_end;
 	void *data = (void *)(long)ctx->data;
 	struct ethhdr *eth = data;
 	struct icmphdr *icmph;

tools/testing/selftests/bpf/progs/xdpwall.c

···
 	void *data = (void *)(long)(ctx->data);
 	struct fw_match_info match_info = {};
 	struct pkt_info info = {};
-	__u8 parse_err = NO_ERR;
 	void *transport_hdr;
 	struct ethhdr *eth;
 	bool filter_res;