fork: Provide weak arch_release_[task_struct|thread_info] functions

These functions allow us to move most of the duplicated thread_info
allocators to the core code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20120505150141.366461660@linutronix.de

diff --git a/kernel/fork.c b/kernel/fork.c
index 5d22b9b8cf7b5f156ace2de279ff4a6ee6f9b133..2dfad0269674286750340ac5fd4e86544a72e820 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -112,14 +112,26 @@ int nr_processes(void)
 }
 
 #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
-# define alloc_task_struct_node(node)          \
-               kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node)
-# define free_task_struct(tsk)                 \
-               kmem_cache_free(task_struct_cachep, (tsk))
 static struct kmem_cache *task_struct_cachep;
+
+static inline struct task_struct *alloc_task_struct_node(int node)
+{
+       return kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node);
+}
+
+void __weak arch_release_task_struct(struct task_struct *tsk) { }
+
+static inline void free_task_struct(struct task_struct *tsk)
+{
+       arch_release_task_struct(tsk);
+       kmem_cache_free(task_struct_cachep, tsk);
+}
 #endif
 
 #ifndef __HAVE_ARCH_THREAD_INFO_ALLOCATOR
+
+void __weak arch_release_thread_info(struct thread_info *ti) { }
+
 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
                                                  int node)
 {
@@ -131,6 +143,7 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
 
 static inline void free_thread_info(struct thread_info *ti)
 {
+       arch_release_thread_info(ti);
        free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 }
 #endif