tree f942e4cd04a29b8f50ec5a57db535da79fcdd068
parent 2c2f6abeff1322a61f5ad7ce0ecccabf53e4fad5
author Hao Luo <haoluo@google.com> 1601423447 -0700
committer Alexei Starovoitov <ast@kernel.org> 1601676049 -0700

bpf: Introduce bpf_per_cpu_ptr()

Add bpf_per_cpu_ptr() to help bpf programs access percpu vars.
bpf_per_cpu_ptr() has the same semantic as per_cpu_ptr() in the kernel
except that it may return NULL. This happens when the cpu parameter is
out of range. So the caller must check the returned value.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200929235049.2533242-5-haoluo@google.com