[tip:smp/hotplug] fork: Provide weak arch_release_[ task_struct|thread_info] functions

[tip-bot for Thomas Gleixner <tglx@linutronix.de>]

Commit-ID:  41101809a865dd0be1b56eff46c83fad321870b2
Gitweb:     http://git.kernel.org/tip/41101809a865dd0be1b56eff46c83fad321870b2
Author:     Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Sat, 5 May 2012 15:05:41 +0000
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 8 May 2012 13:55:20 +0200

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

---
 kernel/fork.c |   21 +++++++++++++++++----
 1 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 5d22b9b..2dfad02 100644
--- 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