c8ed668593
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 <andrii@kernel.org> Link: https://lore.kernel.org/r/20230309054015.4068562-4-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
33 lines
728 B
C
33 lines
728 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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#include <linux/bpf.h>
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#include <stdint.h>
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
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__uint(value_size, sizeof(int));
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__uint(key_size, sizeof(int));
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} perfbuf SEC(".maps");
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const volatile int batch_cnt = 0;
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long sample_val = 42;
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long dropped __attribute__((aligned(128))) = 0;
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SEC("fentry/" SYS_PREFIX "sys_getpgid")
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int bench_perfbuf(void *ctx)
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{
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int i;
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for (i = 0; i < batch_cnt; i++) {
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if (bpf_perf_event_output(ctx, &perfbuf, BPF_F_CURRENT_CPU,
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&sample_val, sizeof(sample_val)))
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__sync_add_and_fetch(&dropped, 1);
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}
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return 0;
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}
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