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authorToke Høiland-Jørgensen <toke@redhat.com>2020-09-29 14:45:50 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-09-29 13:09:23 -0700
commit3aac1ead5eb6b76f3d2b8d111e6de1c2de23fb34 (patch)
treefb66fb0f2de431275e8c5a09d896a97f9641dacb /include/dt-bindings/power
parent85e3f318506ece12714535821d0b3186f7121b5b (diff)
bpf: Move prog->aux->linked_prog and trampoline into bpf_link on attach
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
Diffstat (limited to 'include/dt-bindings/power')
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