mirror of https://gitee.com/openkylin/linux.git
3aac1ead5e
In preparation for allowing multiple attachments of freplace programs, move the references to the target program and trampoline into the bpf_tracing_link structure when that is created. To do this atomically, introduce a new mutex in prog->aux to protect writing to the two pointers to target prog and trampoline, and rename the members to make it clear that they are related. With this change, it is no longer possible to attach the same tracing program multiple times (detaching in-between), since the reference from the tracing program to the target disappears on the first attach. However, since the next patch will let the caller supply an attach target, that will also make it possible to attach to the same place multiple times. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/160138355059.48470.2503076992210324984.stgit@toke.dk |
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| .gitignore | ||
| Makefile | ||
| README | ||
| bpf_preload_common.h | ||
| iterators.bpf.c | ||
| iterators.c | ||
| iterators.skel.h | ||
README
WARNING: If you change "iterators.bpf.c" do "make -j" in this directory to rebuild "iterators.skel.h". Make sure to have clang 10 installed. See Documentation/bpf/bpf_devel_QA.rst