linux-kernel - [RFC bpf-next 03/13] bpf: Move percpu memory allocator definition into core

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Message-ID: <20016bd97ab4aa47c4c49f9e46bf6ac0b4c4a124.1744169424.git.dxu@dxuuu.xyz>
Date: Tue,  8 Apr 2025 21:33:58 -0600
From: Daniel Xu <dxu@...uu.xyz>
To: andrii@...nel.org,
	ast@...nel.org,
	daniel@...earbox.net
Cc: john.fastabend@...il.com,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	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: [RFC bpf-next 03/13] bpf: Move percpu memory allocator definition into core

The BPF percpu memory allocator is used from multiple places. So move it
into the core and have verifier.c simply consume it.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 include/linux/bpf.h   | 2 +-
 kernel/bpf/core.c     | 6 ++++++
 kernel/bpf/verifier.c | 3 ---
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index f1c5356dc099..8e26141f3e7e 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -64,7 +64,7 @@ extern struct idr btf_idr;
 extern spinlock_t btf_idr_lock;
 extern struct kobject *btf_kobj;
 extern struct bpf_mem_alloc bpf_global_ma, bpf_global_percpu_ma;
-extern bool bpf_global_ma_set;
+extern bool bpf_global_ma_set, bpf_global_percpu_ma_set;
 
 typedef u64 (*bpf_callback_t)(u64, u64, u64, u64, u64);
 typedef int (*bpf_iter_init_seq_priv_t)(void *private_data,
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index ba6b6118cf50..80ba83cb6350 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -68,6 +68,12 @@
 struct bpf_mem_alloc bpf_global_ma;
 bool bpf_global_ma_set;
 
+struct bpf_mem_alloc bpf_global_percpu_ma;
+EXPORT_SYMBOL_GPL(bpf_global_percpu_ma);
+
+bool bpf_global_percpu_ma_set;
+EXPORT_SYMBOL_GPL(bpf_global_percpu_ma_set);
+
 /* No hurry in this branch
  *
  * Exported for the bpf jit load helper.
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 6ed302dab08b..322c1674b626 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -44,9 +44,6 @@ static const struct bpf_verifier_ops * const bpf_verifier_ops[] = {
 #undef BPF_LINK_TYPE
 };
 
-struct bpf_mem_alloc bpf_global_percpu_ma;
-static bool bpf_global_percpu_ma_set;
-
 /* bpf_check() is a static code analyzer that walks eBPF program
  * instruction by instruction and updates register/stack state.
  * All paths of conditional branches are analyzed until 'bpf_exit' insn.
-- 
2.47.1