types: move struct rcuwait into types.h

Move rcuwait struct definition into types.h so that rcuwait can be used
without including rcuwait.h which includes other headers.  Without this
change mm_types.h can't use rcuwait due to a the following circular
dependency:

mm_types.h -> rcuwait.h -> signal.h -> mm_types.h

Link: https://lkml.kernel.org/r/20250213224655.1680278-7-surenb@google.com
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
Acked-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Tested-by: Shivank Garg <shivankg@amd.com>
Link: https://lkml.kernel.org/r/5e19ec93-8307-47c2-bb13-3ddf7150624e@amd.com
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/rcuwait.h b/include/linux/rcuwait.h
index 27343424225cfb0d7a0e8a847d3096bf699a41d9..9ad134a04b415617ae86f7adf1e52cbdcab5d583 100644 (file)
--- a/include/linux/rcuwait.h
+++ b/include/linux/rcuwait.h
@@ -4,18 +4,7 @@
 
 #include <linux/rcupdate.h>
 #include <linux/sched/signal.h>
-
-/*
- * rcuwait provides a way of blocking and waking up a single
- * task in an rcu-safe manner.
- *
- * The only time @task is non-nil is when a user is blocked (or
- * checking if it needs to) on a condition, and reset as soon as we
- * know that the condition has succeeded and are awoken.
- */
-struct rcuwait {
-       struct task_struct __rcu *task;
-};
+#include <linux/types.h>
 
 #define __RCUWAIT_INITIALIZER(name)            \
        { .task = NULL, }

diff --git a/include/linux/types.h b/include/linux/types.h
index 1c509ce8f7f616e1a7100554f2c296a9b263d08e..a3d2182c2686348031768e828071d927c448a829 100644 (file)
--- a/include/linux/types.h
+++ b/include/linux/types.h
@@ -248,5 +248,17 @@ typedef void (*swap_func_t)(void *a, void *b, int size);
 typedef int (*cmp_r_func_t)(const void *a, const void *b, const void *priv);
 typedef int (*cmp_func_t)(const void *a, const void *b);
 
+/*
+ * rcuwait provides a way of blocking and waking up a single
+ * task in an rcu-safe manner.
+ *
+ * The only time @task is non-nil is when a user is blocked (or
+ * checking if it needs to) on a condition, and reset as soon as we
+ * know that the condition has succeeded and are awoken.
+ */
+struct rcuwait {
+       struct task_struct __rcu *task;
+};
+
 #endif /*  __ASSEMBLY__ */
 #endif /* _LINUX_TYPES_H */