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Andrii Nakryiko 4f60975a56 selftests/bpf: Fix sample_cnt shared between two threads 
[upstream commit 9a5f25ad30e5bb40a2e0c61c991594d3e6529c0a]

Make sample_cnt volatile to fix possible selftests failure due to compiler
optimization preventing latest sample_cnt value to be visible to main thread.
sample_cnt is incremented in background thread, which is then joined into main
thread. So in terms of visibility sample_cnt update is ok. But because it's
not volatile, compiler might make optimizations that would prevent main thread
to see latest updated value. Fix this by marking global variable volatile.

Fixes: cb1c9ddd5525 ("selftests/bpf: Add BPF ringbuf selftests")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200602050349.215037-1-andriin@fb.com
 		2022-08-30 11:33:34 +08:00
Documentation docs/bpf: Add BPF ring buffer design notes 2022-08-30 11:33:29 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch bpf: Fix trampoline generation for fmod_ret programs 2022-08-30 11:33:21 +08:00
block Add sysfs attribute to hide disk devices 2022-07-25 16:24:47 +08:00
certs certs: Fix blacklist flag type confusion 2021-04-12 12:52:25 +08:00
crypto crypto: rng - fix crypto_rng_reset() refcounting when !CRYPTO_STATS 2021-05-20 16:07:34 +08:00
drivers bpf: Implement CAP_BPF 2022-08-30 11:33:26 +08:00
fs bpf: Refactor to provide aux info to bpf_iter_init_seq_priv_t 2022-08-30 11:33:28 +08:00
include bpf: Add support for forced LINK_DETACH command 2022-08-30 11:33:32 +08:00
init bpf: Introduce BPF_PROG_TYPE_LSM 2022-08-30 11:33:21 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel bpf: Fix leak in LINK_UPDATE and enforce empty old_prog_fd 2022-08-30 11:33:32 +08:00
lib bug: Remove redundant condition check in report_bug 2021-05-20 16:07:55 +08:00
mm uaccess: Add strict non-pagefault kernel-space read function 2022-08-30 11:33:18 +08:00
net bpf: Add selftests for BPF_MODIFY_RETURN 2022-08-30 11:33:31 +08:00
package config: enable CONFIG_ZRAM 2022-08-24 17:40:05 +08:00
samples kfifo: fix ternary sign extension bugs 2021-05-20 16:08:01 +08:00
scripts libbpf: update libbpf to v0.2.0 2022-08-30 11:33:31 +08:00
security bpf: Implement bpf_local_storage for inodes 2022-08-30 11:33:29 +08:00
sound ALSA: usb: midi: don't return -ENOMEM when usb_urb_ep_type_check fails 2021-05-20 16:07:59 +08:00
tools selftests/bpf: Fix sample_cnt shared between two threads 2022-08-30 11:33:34 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: Stop looking for coalesced MMIO zones if the bus is destroyed 2021-05-20 16:07:44 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS bpf: Introduce BPF_PROG_TYPE_LSM 2022-08-30 11:33:21 +08:00
Makefile bpf: Resolve BTF IDs in vmlinux image 2022-08-30 11:33:27 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

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Tencent Linux Kernel 4.0