Inline bpf_get_current_task() and bpf_get_current_task_btf() for x86_64
to obtain better performance, and add the testcase for it.

Changes since v4:
* don't support the !CONFIG_SMP case
* v4: https://lore.kernel.org/bpf/20260112104529.224645-1-dongml2@chinatelecom.cn/

Changes since v3:
* handle the !CONFIG_SMP case
* ignore the !CONFIG_SMP case in the testcase, as we enable CONFIG_SMP
  for x86_64 in the selftests

Changes since v2:
* implement it in the verifier with BPF_MOV64_PERCPU_REG() instead of in
  x86_64 JIT (Alexei).

Changes since v1:
* add the testcase
* remove the usage of const_current_task

Menglong Dong (2):
  bpf, x86: inline bpf_get_current_task() for x86_64
  selftests/bpf: test the jited inline of bpf_get_current_task

 kernel/bpf/verifier.c                         | 22 ++++++++++++
 .../selftests/bpf/prog_tests/verifier.c       |  2 ++
 .../selftests/bpf/progs/verifier_jit_inline.c | 35 +++++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/verifier_jit_inline.c

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2.52.0