From: Siddharth Nayyar <sidnayyar@google.com>
Date: Thu, 26 Mar 2026 21:25:04 +0000 (+0000)
Subject: module: populate kflagstab in modpost
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=16d0e04f546ffba78c74bbfeb57d93147bcaf2c5;p=thirdparty%2Flinux.git

module: populate kflagstab in modpost

This patch adds the ability to create entries for kernel symbol flag
bitsets in kflagstab. Modpost populates only the GPL-only flag for now.

Signed-off-by: Siddharth Nayyar <sidnayyar@google.com>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---

diff --git a/include/linux/export-internal.h b/include/linux/export-internal.h
index d445705ac13c0..4123c7592404a 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 0c25b5ad497b5..1d721fe67caf6 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)
 {
@@ -1874,6 +1879,9 @@ 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)