bpf: drop KF_ACQUIRE flag on BPF kfunc bpf_get_root_mem_cgroup()

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With the BPF verifier now treating pointers to struct types returned
from BPF kfuncs as implicitly trusted by default, there is no need for
bpf_get_root_mem_cgroup() to be annotated with the KF_ACQUIRE flag.

bpf_get_root_mem_cgroup() does not acquire any references, but rather
simply returns a NULL pointer or a pointer to a struct mem_cgroup
object that is valid for the entire lifetime of the kernel.

This simplifies BPF programs using this kfunc by removing the
requirement to pair the call with bpf_put_mem_cgroup().

Signed-off-by: Matt Bobrowski <mattbobrowski@google.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260113083949.2502978-2-mattbobrowski@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Matt Bobrowski 2026-01-13 08:39:48 +00:00 • committed by Alexei Starovoitov

parent f8ade2342e

commit e463b6de9d

1 changed files with 7 additions and 7 deletions

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mm/bpf_memcontrol.c

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