patch-2.4.25 linux-2.4.25/include/asm-i386/mmu_context.h

• Lines: 52
• Date: 2004-02-18 05:36:32.000000000 -0800
• Orig file: linux-2.4.24/include/asm-i386/mmu_context.h
• Orig date: 2002-08-02 17:39:45.000000000 -0700

diff -urN linux-2.4.24/include/asm-i386/mmu_context.h linux-2.4.25/include/asm-i386/mmu_context.h
@@ -7,10 +7,12 @@
 #include <asm/pgalloc.h>
 
 /*
- * possibly do the LDT unload here?
+ * hooks to add arch specific data into the mm struct.
+ * Note that destroy_context is called even if init_new_context
+ * fails.
  */
-#define destroy_context(mm)		do { } while(0)
-#define init_new_context(tsk,mm)	0
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
+void destroy_context(struct mm_struct *mm);
 
 #ifdef CONFIG_SMP
 
@@ -30,19 +32,18 @@
 	if (prev != next) {
 		/* stop flush ipis for the previous mm */
 		clear_bit(cpu, &prev->cpu_vm_mask);
-		/*
-		 * Re-load LDT if necessary
-		 */
-		if (prev->context.segments != next->context.segments)
-			load_LDT(next);
 #ifdef CONFIG_SMP
 		cpu_tlbstate[cpu].state = TLBSTATE_OK;
 		cpu_tlbstate[cpu].active_mm = next;
 #endif
 		set_bit(cpu, &next->cpu_vm_mask);
-		set_bit(cpu, &next->context.cpuvalid);
 		/* Re-load page tables */
 		load_cr3(next->pgd);
+	 	/* load_LDT, if either the previous or next thread
+		 * has a non-default LDT.
+		 */
+		if (next->context.size+prev->context.size)
+			load_LDT(&next->context);
 	}
 #ifdef CONFIG_SMP
 	else {
@@ -54,9 +55,8 @@
 			 * tlb flush IPI delivery. We must reload %cr3.
 			 */
 			load_cr3(next->pgd);
+			load_LDT(&next->context);
 		}
-		if (!test_and_set_bit(cpu, &next->context.cpuvalid))
-			load_LDT(next);
 	}
 #endif
 }