linux-kernel - [PATCH bpf-next v4 1/3] bpf: btf: Support flags for BTF

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Date: Sun, 28 Jan 2024 18:24:06 -0700
From: Daniel Xu <dxu@...uu.xyz>
To: ast@...nel.org,
	daniel@...earbox.net,
	martin.lau@...ux.dev,
	andrii@...nel.org,
	alexei.starovoitov@...il.com,
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Cc: eddyz87@...il.com,
	song@...nel.org,
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	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v4 1/3] bpf: btf: Support flags for BTF_SET8 sets

This commit adds support for flags on BTF_SET8s. struct btf_id_set8
already supported 32 bits worth of flags, but was only used for
alignment purposes before.

We now use these bits to encode flags. The first use case is tagging
kfunc sets with a flag so that pahole can recognize which
BTF_ID_FLAGS(func, ..) are actual kfuncs.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 include/linux/btf_ids.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/linux/btf_ids.h b/include/linux/btf_ids.h
index a9cb10b0e2e9..dca09b7f21dc 100644
--- a/include/linux/btf_ids.h
+++ b/include/linux/btf_ids.h
@@ -21,6 +21,7 @@ struct btf_id_set8 {
 
 #include <linux/compiler.h> /* for __PASTE */
 #include <linux/compiler_attributes.h> /* for __maybe_unused */
+#include <linux/stringify.h>
 
 /*
  * Following macros help to define lists of BTF IDs placed
@@ -183,17 +184,18 @@ extern struct btf_id_set name;
  * .word (1 << 3) | (1 << 1) | (1 << 2)
  *
  */
-#define __BTF_SET8_START(name, scope)			\
+#define __BTF_SET8_START(name, scope, flags)		\
+__BTF_ID_LIST(name, local)				\
 asm(							\
 ".pushsection " BTF_IDS_SECTION ",\"a\";       \n"	\
 "." #scope " __BTF_ID__set8__" #name ";        \n"	\
 "__BTF_ID__set8__" #name ":;                   \n"	\
-".zero 8                                       \n"	\
+".zero 4                                       \n"	\
+".long " __stringify(flags)                   "\n"	\
 ".popsection;                                  \n");
 
 #define BTF_SET8_START(name)				\
-__BTF_ID_LIST(name, local)				\
-__BTF_SET8_START(name, local)
+__BTF_SET8_START(name, local, 0)
 
 #define BTF_SET8_END(name)				\
 asm(							\
-- 
2.42.1