linux-kernel - [PATCH bpf-next v5 0/2] bpf, x86: inline bpf_get_current_task() for x86

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Message-ID: <20260119070246.249499-1-dongml2@chinatelecom.cn>
Date: Mon, 19 Jan 2026 15:02:44 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: ast@...nel.org,
	eddyz87@...il.com
Cc: daniel@...earbox.net,
	john.fastabend@...il.com,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	song@...nel.org,
	yonghong.song@...ux.dev,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v5 0/2] bpf, x86: inline bpf_get_current_task() for x86_64

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

-- 
2.52.0