patch-2.4.21 linux-2.4.21/include/asm-s390x/pgalloc.h

• Lines: 22
• Date: 2003-06-13 07:51:38.000000000 -0700
• Orig file: linux-2.4.20/include/asm-s390x/pgalloc.h
• Orig date: 2002-11-28 15:53:15.000000000 -0800

diff -urN linux-2.4.20/include/asm-s390x/pgalloc.h linux-2.4.21/include/asm-s390x/pgalloc.h
@@ -266,14 +266,15 @@
  */
 static inline void __flush_tlb_mm(struct mm_struct * mm)
 {
-	if ((smp_num_cpus > 1) &&
-	    ((atomic_read(&mm->mm_count) != 1) ||
-	     (mm->cpu_vm_mask != (1UL << smp_processor_id())))) {
-		mm->cpu_vm_mask = (1UL << smp_processor_id());
+	if (mm->cpu_vm_mask != (1UL << smp_processor_id())) {
+		/* mm was active on more than one cpu. */
+		if (mm == current->active_mm &&
+		    atomic_read(&mm->mm_users) == 1)
+			/* this cpu is the only one using the mm. */
+			mm->cpu_vm_mask = 1UL << smp_processor_id();
 		global_flush_tlb();
-	} else {                 
+	} else
 		local_flush_tlb();
-	}
 }
 
 static inline void flush_tlb(void)