X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=mm%2Fmmu_context.c;h=0777654147c9d0e3fd0b676771dc5052bcab9455;hb=c62b1a3b31b5e27a6c5c2e91cc5ce05fdb6344d0;hp=fd473b51c90372244c3acd1c9f1cffcb494cd451;hpb=3d2d827f5ca5e32816194119d5c980c7e04474a6;p=safe%2Fjmp%2Flinux-2.6

diff --git a/mm/mmu_context.c b/mm/mmu_context.c
index fd473b5..0777654 100644
--- a/mm/mmu_context.c
+++ b/mm/mmu_context.c
@@ -5,6 +5,7 @@
 
 #include <linux/mm.h>
 #include <linux/mmu_context.h>
+#include <linux/module.h>
 #include <linux/sched.h>
 
 #include <asm/mmu_context.h>
@@ -26,14 +27,18 @@ void use_mm(struct mm_struct *mm)
 
 	task_lock(tsk);
 	active_mm = tsk->active_mm;
-	atomic_inc(&mm->mm_count);
+	if (active_mm != mm) {
+		atomic_inc(&mm->mm_count);
+		tsk->active_mm = mm;
+	}
 	tsk->mm = mm;
-	tsk->active_mm = mm;
 	switch_mm(active_mm, mm, tsk);
 	task_unlock(tsk);
 
-	mmdrop(active_mm);
+	if (active_mm != mm)
+		mmdrop(active_mm);
 }
+EXPORT_SYMBOL_GPL(use_mm);
 
 /*
  * unuse_mm
@@ -53,3 +58,4 @@ void unuse_mm(struct mm_struct *mm)
 	enter_lazy_tlb(mm, tsk);
 	task_unlock(tsk);
 }
+EXPORT_SYMBOL_GPL(unuse_mm);