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
30 lines
611 B
C
30 lines
611 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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/* 8-byte aligned .bss */
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static volatile long static_var1;
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static volatile int static_var11;
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int var1 = 0;
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/* 4-byte aligned .rodata */
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const volatile int rovar1;
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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 * 2;
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}
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SEC("raw_tp/sys_enter")
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int handler1(const void *ctx)
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{
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var1 = subprog(rovar1) + static_var1 + static_var11;
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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int VERSION SEC("version") = 1;
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