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256eab48e7
In preparation of skipping emitting static variables in BPF skeletons, switch all current selftests uses of static variables to pass data between BPF and user-space to use global variables. All non-read-only `static volatile` variables become just plain global variables by dropping `static volatile` part. Read-only `static volatile const` variables, though, still require `volatile` modifier, otherwise compiler will ignore whatever values are set from user-space. Few static linker tests are using name-conflicting static variables to validate that static linker still properly handles static variables and doesn't trip up on name conflicts. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210507054119.270888-4-andrii@kernel.org
31 lines
684 B
C
31 lines
684 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 .data */
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static volatile int static_var1 = 5;
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static volatile int static_var2 = 6;
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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_var1 + static_var2;
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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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