[PATCH bpf-next] tools/runqslower: add BPF_F_CURRENT_CPU for running selftest on older kernels

* [PATCH bpf-next] tools/runqslower: add BPF_F_CURRENT_CPU for running selftest on older kernels
@ 2020-03-11  4:30 Andrii Nakryiko
  2020-03-11 14:19 ` Daniel Borkmann
  0 siblings, 1 reply; 2+ messages in thread
From: Andrii Nakryiko @ 2020-03-11  4:30 UTC (permalink / raw)
  To: bpf, netdev, ast, daniel; +Cc: andrii.nakryiko, kernel-team, Andrii Nakryiko

Libbpf compiles and runs subset of selftests on each PR in its Github mirror
repository. To allow still building up-to-date selftests against outdated
kernel images, add back BPF_F_CURRENT_CPU definitions back.

N.B. BCC's runqslower version ([0]) doesn't need BPF_F_CURRENT_CPU due to use of
locally checked in vmlinux.h, generated against kernel with 1aae4bdd7879 ("bpf:
Switch BPF UAPI #define constants used from BPF program side to enums")
applied.

  [0] https://github.com/iovisor/bcc/pull/2809

Fixes: 367d82f17eff (" tools/runqslower: Drop copy/pasted BPF_F_CURRENT_CPU definiton")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
 tools/bpf/runqslower/runqslower.bpf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/bpf/runqslower/runqslower.bpf.c b/tools/bpf/runqslower/runqslower.bpf.c
index 0ba501305bad..1f18a409f044 100644
--- a/tools/bpf/runqslower/runqslower.bpf.c
+++ b/tools/bpf/runqslower/runqslower.bpf.c
@@ -5,6 +5,7 @@
 #include "runqslower.h"
 
 #define TASK_RUNNING 0
+#define BPF_F_CURRENT_CPU 0xffffffffULL
 
 const volatile __u64 min_us = 0;
 const volatile pid_t targ_pid = 0;
-- 
2.17.1


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