Yonghong Song 55db92f42f
bpf: Add BPF_KPTR_PERCPU as a field type ...
BPF_KPTR_PERCPU represents a percpu field type like below
struct val_t {
... fields ...
};
struct t {
...
struct val_t __percpu_kptr *percpu_data_ptr;
...
};
where
#define __percpu_kptr __attribute__((btf_type_tag("percpu_kptr")))
While BPF_KPTR_REF points to a trusted kernel object or a trusted
local object, BPF_KPTR_PERCPU points to a trusted local
percpu object.
This patch added basic support for BPF_KPTR_PERCPU
related to percpu_kptr field parsing, recording and free operations.
BPF_KPTR_PERCPU also supports the same map types
as BPF_KPTR_REF does.
Note that unlike a local kptr, it is possible that
a BPF_KTPR_PERCPU struct may not contain any
special fields like other kptr, bpf_spin_lock, bpf_list_head, etc.
Signed-off-by: Yonghong Song <yonghong.song@linux.dev >
Link: https://lore.kernel.org/r/20230827152739.1996391-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
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