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| author |   Stanislav Fomichev <sdf@google.com> | 2021-03-19 17:00:01 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2021-03-19 19:25:39 -0700 |
| commit | b9082970478009b778aa9b22d5561eef35b53b63 (patch) | |
| tree | c94b34dac36e81130d41eae939186180de7eaedb /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | bpf: Fix umd memory leak in copy_process() (diff) | |
| download | wireguard-linux-b9082970478009b778aa9b22d5561eef35b53b63.tar.xz wireguard-linux-b9082970478009b778aa9b22d5561eef35b53b63.zip | |
bpf: Use NOP_ATOMIC5 instead of emit_nops(&prog, 5) for BPF_TRAMP_F_CALL_ORIG
__bpf_arch_text_poke does rewrite only for atomic nop5, emit_nops(xxx, 5)
emits non-atomic one which breaks fentry/fexit with k8 atomics:
P6_NOP5 == P6_NOP5_ATOMIC (0f1f440000 == 0f1f440000)
K8_NOP5 != K8_NOP5_ATOMIC (6666906690 != 6666666690)
Can be reproduced by doing "ideal_nops = k8_nops" in "arch_init_ideal_nops()
and running fexit_bpf2bpf selftest.
Fixes: e21aa341785c ("bpf: Fix fexit trampoline.")
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210320000001.915366-1-sdf@google.com
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions