28 lines
900 B
Diff
28 lines
900 B
Diff
From: Ben Hutchings <ben@decadent.org.uk>
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Date: Sun, 21 Feb 2016 15:33:15 +0000
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Subject: tools/build: Remove bpf() run-time check at build time
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Forwarded: no
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It is not correct to test that a syscall works on the build system's
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kernel. We might be building on an earlier kernel version or with
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security restrictions that block bpf().
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Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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---
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--- a/tools/build/feature/test-bpf.c
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+++ b/tools/build/feature/test-bpf.c
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@@ -35,8 +35,10 @@ int main(void)
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attr.prog_flags = 0;
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/*
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- * Test existence of __NR_bpf and BPF_PROG_LOAD.
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- * This call should fail if we run the testcase.
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+ * bwh: Don't use the bpf() syscall as we might be building on a
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+ * much older kernel. Do "use" the attr structure here to avoid
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+ * a "set but not used" warning.
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*/
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- return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
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+ (void)&attr;
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+ return 0;
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}
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