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| author | Anders Roxell <anders.roxell@linaro.org> | 2019-02-22 09:46:52 +0100 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-02-25 22:18:07 +0100 |
| commit | fd92d6648feb83888e40f0aa2f74e1d9bbd2ad7d (patch) | |
| tree | 628a3182cd545fb30f322c4b926ac23cfe61dc4b /lib/test_bpf.c | |
| parent | 915654fd718c2366871b19f8c6687e61909db911 (diff) | |
| download | lwn-fd92d6648feb83888e40f0aa2f74e1d9bbd2ad7d.tar.gz lwn-fd92d6648feb83888e40f0aa2f74e1d9bbd2ad7d.zip | |
bpf: test_bpf: turn off preemption in function __run_once
When running BPF test suite the following splat occurs:
[ 415.930950] test_bpf: #0 TAX jited:0
[ 415.931067] BUG: assuming atomic context at lib/test_bpf.c:6674
[ 415.946169] in_atomic(): 0, irqs_disabled(): 0, pid: 11556, name: modprobe
[ 415.953176] INFO: lockdep is turned off.
[ 415.957207] CPU: 1 PID: 11556 Comm: modprobe Tainted: G W 5.0.0-rc7-next-20190220 #1
[ 415.966328] Hardware name: HiKey Development Board (DT)
[ 415.971592] Call trace:
[ 415.974069] dump_backtrace+0x0/0x160
[ 415.977761] show_stack+0x24/0x30
[ 415.981104] dump_stack+0xc8/0x114
[ 415.984534] __cant_sleep+0xf0/0x108
[ 415.988145] test_bpf_init+0x5e0/0x1000 [test_bpf]
[ 415.992971] do_one_initcall+0x90/0x428
[ 415.996837] do_init_module+0x60/0x1e4
[ 416.000614] load_module+0x1de0/0x1f50
[ 416.004391] __se_sys_finit_module+0xc8/0xe0
[ 416.008691] __arm64_sys_finit_module+0x24/0x30
[ 416.013255] el0_svc_common+0x78/0x130
[ 416.017031] el0_svc_handler+0x38/0x78
[ 416.020806] el0_svc+0x8/0xc
Rework so that preemption is disabled when we loop over function
'BPF_PROG_RUN(...)'.
Fixes: 568f196756ad ("bpf: check that BPF programs run with preemption disabled")
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'lib/test_bpf.c')
| -rw-r--r-- | lib/test_bpf.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c index f3e570722a7e..0845f635f404 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -6668,12 +6668,14 @@ static int __run_one(const struct bpf_prog *fp, const void *data, u64 start, finish; int ret = 0, i; + preempt_disable(); start = ktime_get_ns(); for (i = 0; i < runs; i++) ret = BPF_PROG_RUN(fp, data); finish = ktime_get_ns(); + preempt_enable(); *duration = finish - start; do_div(*duration, runs); |