samples/bpf: unify bpf program suffix to .bpf with tracing programs

Currently, BPF programs typically have a suffix of .bpf.c. However,
some programs still utilize a mixture of _kern.c suffix alongside the
naming convention. In order to achieve consistency in the naming of
these programs, this commit unifies the inconsistency in the naming
convention of BPF kernel programs.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20230818090119.477441-4-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 0 insertions, 149 deletions

diff --git a/samples/bpf/offwaketime_kern.c b/samples/bpf/offwaketime_kern.c
deleted file mode 100644
index 8e5105811178..000000000000
--- a/samples/bpf/offwaketime_kern.c
+++ /dev/null
@@ -1,149 +0,0 @@
-/* Copyright (c) 2016 Facebook
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- */
-#include "vmlinux.h"
-#include <linux/version.h>
-#include <bpf/bpf_helpers.h>
-#include <bpf/bpf_tracing.h>
-
-#ifndef PERF_MAX_STACK_DEPTH
-#define PERF_MAX_STACK_DEPTH         127
-#endif
-
-#define _(P)                                                                   \
-	({                                                                     \
-		typeof(P) val;                                                 \
-		bpf_probe_read_kernel(&val, sizeof(val), &(P));                \
-		val;                                                           \
-	})
-
-#define MINBLOCK_US	1
-#define MAX_ENTRIES	10000
-
-struct key_t {
-	char waker[TASK_COMM_LEN];
-	char target[TASK_COMM_LEN];
-	u32 wret;
-	u32 tret;
-};
-
-struct {
-	__uint(type, BPF_MAP_TYPE_HASH);
-	__type(key, struct key_t);
-	__type(value, u64);
-	__uint(max_entries, MAX_ENTRIES);
-} counts SEC(".maps");
-
-struct {
-	__uint(type, BPF_MAP_TYPE_HASH);
-	__type(key, u32);
-	__type(value, u64);
-	__uint(max_entries, MAX_ENTRIES);
-} start SEC(".maps");
-
-struct wokeby_t {
-	char name[TASK_COMM_LEN];
-	u32 ret;
-};
-
-struct {
-	__uint(type, BPF_MAP_TYPE_HASH);
-	__type(key, u32);
-	__type(value, struct wokeby_t);
-	__uint(max_entries, MAX_ENTRIES);
-} wokeby SEC(".maps");
-
-struct {
-	__uint(type, BPF_MAP_TYPE_STACK_TRACE);
-	__uint(key_size, sizeof(u32));
-	__uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64));
-	__uint(max_entries, MAX_ENTRIES);
-} stackmap SEC(".maps");
-
-#define STACKID_FLAGS (0 | BPF_F_FAST_STACK_CMP)
-
-SEC("kprobe/try_to_wake_up")
-int waker(struct pt_regs *ctx)
-{
-	struct task_struct *p = (void *) PT_REGS_PARM1(ctx);
-	struct wokeby_t woke;
-	u32 pid;
-
-	pid = _(p->pid);
-
-	bpf_get_current_comm(&woke.name, sizeof(woke.name));
-	woke.ret = bpf_get_stackid(ctx, &stackmap, STACKID_FLAGS);
-
-	bpf_map_update_elem(&wokeby, &pid, &woke, BPF_ANY);
-	return 0;
-}
-
-static inline int update_counts(void *ctx, u32 pid, u64 delta)
-{
-	struct wokeby_t *woke;
-	u64 zero = 0, *val;
-	struct key_t key;
-
-	__builtin_memset(&key.waker, 0, sizeof(key.waker));
-	bpf_get_current_comm(&key.target, sizeof(key.target));
-	key.tret = bpf_get_stackid(ctx, &stackmap, STACKID_FLAGS);
-	key.wret = 0;
-
-	woke = bpf_map_lookup_elem(&wokeby, &pid);
-	if (woke) {
-		key.wret = woke->ret;
-		__builtin_memcpy(&key.waker, woke->name, sizeof(key.waker));
-		bpf_map_delete_elem(&wokeby, &pid);
-	}
-
-	val = bpf_map_lookup_elem(&counts, &key);
-	if (!val) {
-		bpf_map_update_elem(&counts, &key, &zero, BPF_NOEXIST);
-		val = bpf_map_lookup_elem(&counts, &key);
-		if (!val)
-			return 0;
-	}
-	(*val) += delta;
-	return 0;
-}
-
-#if 1
-/* taken from /sys/kernel/tracing/events/sched/sched_switch/format */
-SEC("tracepoint/sched/sched_switch")
-int oncpu(struct trace_event_raw_sched_switch *ctx)
-{
-	/* record previous thread sleep time */
-	u32 pid = ctx->prev_pid;
-#else
-SEC("kprobe/finish_task_switch")
-int oncpu(struct pt_regs *ctx)
-{
-	struct task_struct *p = (void *) PT_REGS_PARM1(ctx);
-	/* record previous thread sleep time */
-	u32 pid = _(p->pid);
-#endif
-	u64 delta, ts, *tsp;
-
-	ts = bpf_ktime_get_ns();
-	bpf_map_update_elem(&start, &pid, &ts, BPF_ANY);
-
-	/* calculate current thread's delta time */
-	pid = bpf_get_current_pid_tgid();
-	tsp = bpf_map_lookup_elem(&start, &pid);
-	if (!tsp)
-		/* missed start or filtered */
-		return 0;
-
-	delta = bpf_ktime_get_ns() - *tsp;
-	bpf_map_delete_elem(&start, &pid);
-	delta = delta / 1000;
-	if (delta < MINBLOCK_US)
-		return 0;
-
-	return update_counts(ctx, pid, delta);
-}
-char _license[] SEC("license") = "GPL";
-u32 _version SEC("version") = LINUX_VERSION_CODE;