From 68904ecc46535e28b70658f9b82f97d17c41a138 Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Sun, 21 Feb 2016 15:33:15 +0000 Subject: [PATCH] tools/build: Remove bpf() run-time check at build time 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(). Also fix the test for whether __NR_bpf is defined. Signed-off-by: Ben Hutchings Gbp-Pq: Topic bugfix/all Gbp-Pq: Name tools-build-remove-bpf-run-time-check-at-build-time.patch --- tools/build/feature/test-bpf.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/tools/build/feature/test-bpf.c b/tools/build/feature/test-bpf.c index e04ab89a1013..2b7ee7ce67e4 100644 --- a/tools/build/feature/test-bpf.c +++ b/tools/build/feature/test-bpf.c @@ -9,6 +9,7 @@ # define __NR_bpf 321 # elif defined(__aarch64__) # define __NR_bpf 280 +# else # error __NR_bpf not defined. libbpf does not support your arch. # endif #endif @@ -27,9 +28,5 @@ int main(void) attr.log_level = 0; attr.kern_version = 0; - /* - * Test existence of __NR_bpf and BPF_PROG_LOAD. - * This call should fail if we run the testcase. - */ - return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); + return 0; } -- 2.30.2