Andrii Nakryiko 635599bace selftests/bpf: Sync RCU before unloading bpf_testmod ... If some of the subtests use module BTFs through ksyms, they will cause bpf_prog to take a refcount on bpf_testmod module, which will prevent it from successfully unloading. Module's refcnt is decremented when bpf_prog is freed, which generally happens in RCU callback. So we need to trigger syncronize_rcu() in the kernel, which can be achieved nicely with membarrier(MEMBARRIER_CMD_SHARED) or membarrier(MEMBARRIER_CMD_GLOBAL) syscall. So do that in kernel_sync_rcu() and make it available to other test inside the test_progs. This synchronize_rcu() is called before attempting to unload bpf_testmod. Fixes: 9f7fa22589 ("selftests/bpf: Add bpf_testmod kernel module for testing") Suggested-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Hao Luo <haoluo@google.com> Link: https://lore.kernel.org/bpf/20210112075520.4103414-5-andrii@kernel.org		2021-01-12 17:23:47 -08:00
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accounting
arch	tools headers UAPI: Synch KVM's svm.h header with the kernel	2020-12-24 09:24:20 -03:00
bootconfig	tools/bootconfig: Store size and checksum in footer as le32	2020-11-30 23:22:11 -05:00
bpf	bpftool: Fix compilation failure for net.o with older glibc	2021-01-06 15:27:38 -08:00
build	Merge remote-tracking branch 'torvalds/master' into perf/core	2020-12-17 14:37:24 -03:00
cgroup
debugging	docs: Update documentation to reflect what TAINT_CPU_OUT_OF_SPEC means	2020-12-08 10:53:58 -07:00
edid
firewire
firmware
gpio	tools: gpio: add option to report wall-clock time to gpio-event-mon	2020-12-05 23:22:48 +01:00
hv
iio
include	bpf: Clarify return value of probe str helpers	2021-01-12 21:38:34 +01:00
io_uring
kvm/kvm_stat	tools/kvm_stat: Exempt time-based counters	2020-12-11 19:18:51 -05:00
laptop
leds
lib	libbpf: Clarify kernel type use with USER variants of CORE reading macros	2021-01-08 14:06:03 -08:00
memory-model
objtool	Fix a segfault that occurs when built with Clang.	2020-12-27 09:08:23 -08:00
pci
pcmcia
perf	perf probe: Fix memory leak when synthesizing SDT probes	2020-12-24 10:52:10 -03:00
power	Kbuild updates for v5.11	2020-12-22 14:02:39 -08:00
scripts	tools: Factor HOSTCC, HOSTLD, HOSTAR definitions	2020-11-11 12:18:22 -08:00
spi
testing	selftests/bpf: Sync RCU before unloading bpf_testmod	2021-01-12 17:23:47 -08:00
thermal/tmon
time
usb
virtio	tools/virtio: add barrier for aarch64	2020-12-18 16:14:30 -05:00
vm
wmi
Makefile