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yaml --- r: 97301 b: refs/heads/master c: b1979a5 h: refs/heads/master i: 97299: 256d4d8 v: v3
git-mirror · May 23, 2008 · ad425b2 · ad425b2
1 parent d2e2a97
commit ad425b2
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Showing 2 changed files with 13 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a1289643adb6272c04db9399653ae195072c482a
+refs/heads/master: b1979a5fda7869a790f4fd83fb06c78498d26ba1
diff --git a/trunk/include/asm-x86/tlbflush.h b/trunk/include/asm-x86/tlbflush.h
@@ -22,12 +22,23 @@ static inline void __native_flush_tlb(void)
 
 static inline void __native_flush_tlb_global(void)
 {
-	unsigned long cr4 = read_cr4();
+	unsigned long flags;
+	unsigned long cr4;
 
+	/*
+	 * Read-modify-write to CR4 - protect it from preemption and
+	 * from interrupts. (Use the raw variant because this code can
+	 * be called from deep inside debugging code.)
+	 */
+	raw_local_irq_save(flags);
+
+	cr4 = read_cr4();
 	/* clear PGE */
 	write_cr4(cr4 & ~X86_CR4_PGE);
 	/* write old PGE again and flush TLBs */
 	write_cr4(cr4);
+
+	raw_local_irq_restore(flags);
 }
 
 static inline void __native_flush_tlb_single(unsigned long addr)