vdso/datastore: Always provide symbol declarations

Allow callers to easily reference these symbols in code that is built
even when the generic datastore is disabled.

As there are no good default no-op variants of these symbols, do not
provide stubs but require users to have their own fallback handling
using IS_ENABLED(CONFIG_HAVE_GENERIC_VDSO).

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260521-vdso-mips-kconfig-v1-2-2f79dcd6c78f@linutronix.de

diff --git a/include/linux/vdso_datastore.h b/include/linux/vdso_datastore.h
index 0b530428db711e58660e797d9d3cf5dce60217fe..3dfba9502d78f8288a6a7dec849e47c65a9e9367 100644 (file)
--- a/include/linux/vdso_datastore.h
+++ b/include/linux/vdso_datastore.h
@@ -2,12 +2,12 @@
 #ifndef _LINUX_VDSO_DATASTORE_H
 #define _LINUX_VDSO_DATASTORE_H
 
-#ifdef CONFIG_HAVE_GENERIC_VDSO
 #include <linux/mm_types.h>
 
 extern const struct vm_special_mapping vdso_vvar_mapping;
 struct vm_area_struct *vdso_install_vvar_mapping(struct mm_struct *mm, unsigned long addr);
 
+#ifdef CONFIG_HAVE_GENERIC_VDSO
 void __init vdso_setup_data_pages(void);
 #else /* !CONFIG_HAVE_GENERIC_VDSO */
 static inline void vdso_setup_data_pages(void) { }