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

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/timer_lockup.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/timer_lockup.c
Extension
.c
Size
1628 bytes
Lines
88
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct elem {
	struct bpf_timer t;
};

struct {
	__uint(type, BPF_MAP_TYPE_ARRAY);
	__uint(max_entries, 1);
	__type(key, int);
	__type(value, struct elem);
} timer1_map SEC(".maps");

struct {
	__uint(type, BPF_MAP_TYPE_ARRAY);
	__uint(max_entries, 1);
	__type(key, int);
	__type(value, struct elem);
} timer2_map SEC(".maps");

int timer1_err;
int timer2_err;

static int timer_cb1(void *map, int *k, struct elem *v)
{
	struct bpf_timer *timer;
	int key = 0;

	timer = bpf_map_lookup_elem(&timer2_map, &key);
	if (timer)
		timer2_err = bpf_timer_cancel(timer);

	return 0;
}

static int timer_cb2(void *map, int *k, struct elem *v)
{
	struct bpf_timer *timer;
	int key = 0;

	timer = bpf_map_lookup_elem(&timer1_map, &key);
	if (timer)
		timer1_err = bpf_timer_cancel(timer);

	return 0;
}

SEC("tc")
int timer1_prog(void *ctx)
{
	struct bpf_timer *timer;
	int key = 0;

	timer = bpf_map_lookup_elem(&timer1_map, &key);
	if (timer) {
		bpf_timer_init(timer, &timer1_map, CLOCK_BOOTTIME);
		bpf_timer_set_callback(timer, timer_cb1);
		bpf_timer_start(timer, 1, BPF_F_TIMER_CPU_PIN);
	}

	return 0;
}

SEC("tc")
int timer2_prog(void *ctx)
{
	struct bpf_timer *timer;
	int key = 0;

	timer = bpf_map_lookup_elem(&timer2_map, &key);
	if (timer) {
		bpf_timer_init(timer, &timer2_map, CLOCK_BOOTTIME);
		bpf_timer_set_callback(timer, timer_cb2);
		bpf_timer_start(timer, 1, BPF_F_TIMER_CPU_PIN);
	}

	return 0;
}

Annotation

Implementation Notes