This patch fixes a sparse issue if DEFINE_STATIC_SRCU() of srcutree is
used by a module. Sparse will show:
sparse: symbol '__srcu_struct_nodes_srcu' was not declared. Should it be static?
The problem is here that the DEFINE_STATIC_SRCU() of srcutree uses
__DEFINE_SRCU() and define a non-static srcu_struct. This srcu_struct
will be exported by inserting it in a special module section
'__section("___srcu_struct_ptrs")'. During load/unloading srcutree runs
their init/cleanup functionality. It seems sparse does not understand
this connection. To avoid the sparse warning we make a prototype of the
exported srcu_struct with an export keyword. This way we tell the
that the srcu_struct might be used outside of the module.
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
---
include/linux/srcutree.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/srcutree.h b/include/linux/srcutree.h
index cb1f4351e8ba..f81be0749484 100644
--- a/include/linux/srcutree.h
+++ b/include/linux/srcutree.h
@@ -121,6 +121,7 @@ struct srcu_struct {
#ifdef MODULE
# define __DEFINE_SRCU(name, is_static) \
is_static struct srcu_struct name; \
+ extern struct srcu_struct * const __srcu_struct_##name; \
struct srcu_struct * const __srcu_struct_##name \
__section("___srcu_struct_ptrs") = &name
#else
--
2.31.1
