[20/27] Split init_new_context and destroy_context

Commit Message

Alexander Graf Oct. 30, 2009, 3:47 p.m. UTC

None

Patch

diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index b34e94d..66b35d0 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -23,6 +23,11 @@  extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
 extern void set_context(unsigned long id, pgd_t *pgd);
 
 #ifdef CONFIG_PPC_BOOK3S_64
+extern int __init_new_context(void);
+extern void __destroy_context(int context_id);
+#endif
+
+#ifdef CONFIG_PPC_BOOK3S_64
 static inline void mmu_context_init(void) { }
 #else
 extern void mmu_context_init(void);
diff --git a/arch/powerpc/mm/mmu_context_hash64.c b/arch/powerpc/mm/mmu_context_hash64.c
index dbeb86a..b9e4cc2 100644
--- a/arch/powerpc/mm/mmu_context_hash64.c
+++ b/arch/powerpc/mm/mmu_context_hash64.c
@@ -18,6 +18,7 @@ 
 #include <linux/mm.h>
 #include <linux/spinlock.h>
 #include <linux/idr.h>
+#include <linux/module.h>
 
 #include <asm/mmu_context.h>
 
@@ -32,7 +33,7 @@  static DEFINE_IDR(mmu_context_idr);
 #define NO_CONTEXT	0
 #define MAX_CONTEXT	((1UL << 19) - 1)
 
-int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+int __init_new_context(void)
 {
 	int index;
 	int err;
@@ -57,6 +58,18 @@  again:
 		return -ENOMEM;
 	}
 
+	return index;
+}
+EXPORT_SYMBOL_GPL(__init_new_context);
+
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+	int index;
+
+	index = __init_new_context();
+	if (index < 0)
+		return index;
+
 	/* The old code would re-promote on fork, we don't do that
 	 * when using slices as it could cause problem promoting slices
 	 * that have been forced down to 4K
@@ -68,11 +81,16 @@  again:
 	return 0;
 }
 
-void destroy_context(struct mm_struct *mm)
+void __destroy_context(int context_id)
 {
 	spin_lock(&mmu_context_lock);
-	idr_remove(&mmu_context_idr, mm->context.id);
+	idr_remove(&mmu_context_idr, context_id);
 	spin_unlock(&mmu_context_lock);
+}
+EXPORT_SYMBOL_GPL(__destroy_context);
 
+void destroy_context(struct mm_struct *mm)
+{
+	__destroy_context(mm->context.id);
 	mm->context.id = NO_CONTEXT;
 }