a0964f526d
Add Makefile infra to specify multi-file BPF object files (and derivative skeletons). Add first selftest validating BPF static linker can merge together successfully two independent BPF object files and resulting object and skeleton are correct and usable. Use the same F(F(F(X))) = F(F(X)) identity test on linked object files as for the case of single BPF object files. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210318194036.3521577-13-andrii@kernel.org
31 lines
677 B
C
31 lines
677 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2021 Facebook */
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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/* 4-byte aligned .bss */
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static volatile int static_var2;
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static volatile int static_var22;
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int var2 = 0;
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/* 8-byte aligned .rodata */
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const volatile long rovar2;
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/* same "subprog" name in both files */
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static __noinline int subprog(int x)
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{
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/* but different formula */
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return x * 3;
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}
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SEC("raw_tp/sys_enter")
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int handler2(const void *ctx)
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{
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var2 = subprog(rovar2) + static_var2 + static_var22;
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return 0;
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}
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/* different name and/or type of the variable doesn't matter */
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char _license[] SEC("license") = "GPL";
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int _version SEC("version") = 1;
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