linux-kernel - [PATCH bpf-next v2 2/3] bpf: btf: Add BTF_KFUNCS

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Date: Thu,  4 Jan 2024 19:45:48 -0700
From: Daniel Xu <dxu@...uu.xyz>
To: martin.lau@...ux.dev,
	daniel@...earbox.net,
	ast@...nel.org,
	andrii@...nel.org,
	alexei.starovoitov@...il.com,
	olsajiri@...il.com,
	quentin@...valent.com,
	alan.maguire@...cle.com,
	memxor@...il.com
Cc: song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...gle.com,
	haoluo@...gle.com,
	jolsa@...nel.org,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v2 2/3] bpf: btf: Add BTF_KFUNCS_START/END macro pair

This macro pair is functionally equivalent to BTF_SET8_START/END, except
with BTF_SET8_KFUNCS flag set in the btf_id_set8 flags field. The next
commit will codemod all kfunc set8s to this new variant such that all
kfuncs are tagged as such in .BTF_ids section.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 include/linux/btf_ids.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index dca09b7f21dc..0fe4f1cd1918 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -8,6 +8,9 @@ struct btf_id_set {
 	u32 ids[];
 };
 
+/* This flag implies BTF_SET8 holds kfunc(s) */
+#define BTF_SET8_KFUNCS		(1 << 0)
+
 struct btf_id_set8 {
 	u32 cnt;
 	u32 flags;
@@ -204,6 +207,12 @@ asm(							\
 ".popsection;                                 \n");	\
 extern struct btf_id_set8 name;
 
+#define BTF_KFUNCS_START(name)				\
+__BTF_SET8_START(name, local, BTF_SET8_KFUNCS)
+
+#define BTF_KFUNCS_END(name)				\
+BTF_SET8_END(name)
+
 #else
 
 #define BTF_ID_LIST(name) static u32 __maybe_unused name[64];
@@ -218,6 +227,8 @@ extern struct btf_id_set8 name;
 #define BTF_SET_END(name)
 #define BTF_SET8_START(name) static struct btf_id_set8 __maybe_unused name = { 0 };
 #define BTF_SET8_END(name)
+#define BTF_KFUNCS_START(name) static struct btf_id_set8 __maybe_unused name = { 0 };
+#define BTF_KFUNCS_END(name)
 
 #endif /* CONFIG_DEBUG_INFO_BTF */
 
-- 
2.42.1