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