linux-kernel - [PATCH v3 3/8] modpost: create entries for kflagstab

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Message-ID: <20251103161954.1351784-4-sidnayyar@google.com>
Date: Mon,  3 Nov 2025 16:19:49 +0000
From: Siddharth Nayyar <sidnayyar@...gle.com>
To: petr.pavlu@...e.com, corbet@....net
Cc: arnd@...db.de, linux-arch@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org, 
	mcgrof@...nel.org, nathan@...nel.org, nicolas.schier@...ux.dev, 
	samitolvanen@...gle.com, sidnayyar@...gle.com, maennich@...gle.com, 
	gprocida@...gle.com
Subject: [PATCH v3 3/8] modpost: create entries for kflagstab

Signed-off-by: Siddharth Nayyar <sidnayyar@...gle.com>
Reviewed-by: Petr Pavlu <petr.pavlu@...e.com>
---
 include/linux/export-internal.h | 7 +++++++
 scripts/mod/modpost.c           | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/export-internal.h b/include/linux/export-internal.h
index d445705ac13c..4123c7592404 100644
--- a/include/linux/export-internal.h
+++ b/include/linux/export-internal.h
@@ -69,4 +69,11 @@
 	    ".long " #crc					"\n" \
 	    ".previous"						"\n")
 
+#define SYMBOL_FLAGS(sym, flags)					\
+	asm("	.section \"___kflagstab+" #sym "\",\"a\""	"\n"	\
+	    "__flags_" #sym ":"					"\n"	\
+	    "	.byte " #flags					"\n"	\
+	    "	.previous"					"\n"	\
+	)
+
 #endif /* __LINUX_EXPORT_INTERNAL_H__ */
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 5ca7c268294e..f5ce7aeed52d 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -244,6 +244,11 @@ static struct symbol *alloc_symbol(const char *name)
 	return s;
 }
 
+static uint8_t get_symbol_flags(const struct symbol *sym)
+{
+	return sym->is_gpl_only ? KSYM_FLAG_GPL_ONLY : 0;
+}
+
 /* For the hash of exported symbols */
 static void hash_add_symbol(struct symbol *sym)
 {
@@ -1865,6 +1870,9 @@ static void add_exported_symbols(struct buffer *buf, struct module *mod)
 		buf_printf(buf, "KSYMTAB_%s(%s, \"%s\", \"%s\");\n",
 			   sym->is_func ? "FUNC" : "DATA", sym->name,
 			   sym->is_gpl_only ? "_gpl" : "", sym->namespace);
+
+		buf_printf(buf, "SYMBOL_FLAGS(%s, 0x%02x);\n",
+			   sym->name, get_symbol_flags(sym));
 	}
 
 	if (!modversions)
-- 
2.51.1.930.gacf6e81ea2-goog