x86/tlb: Disable interrupts when changing CR4

[linux-2.6-microblaze.git] / arch / x86 / include / asm / tlbflush.h

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index e736f7f..877b5c1 100644 (file)
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -175,6 +175,7 @@ static inline void cr4_init_shadow(void)
 
 static inline void __cr4_set(unsigned long cr4)
 {
+       lockdep_assert_irqs_disabled();
        this_cpu_write(cpu_tlbstate.cr4, cr4);
        __write_cr4(cr4);
 }
@@ -182,24 +183,28 @@ static inline void __cr4_set(unsigned long cr4)
 /* Set in this cpu's CR4. */
 static inline void cr4_set_bits(unsigned long mask)
 {
-       unsigned long cr4;
+       unsigned long cr4, flags;
 
+       local_irq_save(flags);
        cr4 = this_cpu_read(cpu_tlbstate.cr4);
        if ((cr4 | mask) != cr4)
                __cr4_set(cr4 | mask);
+       local_irq_restore(flags);
 }
 
 /* Clear in this cpu's CR4. */
 static inline void cr4_clear_bits(unsigned long mask)
 {
-       unsigned long cr4;
+       unsigned long cr4, flags;
 
+       local_irq_save(flags);
        cr4 = this_cpu_read(cpu_tlbstate.cr4);
        if ((cr4 & ~mask) != cr4)
                __cr4_set(cr4 & ~mask);
+       local_irq_restore(flags);
 }
 
-static inline void cr4_toggle_bits(unsigned long mask)
+static inline void cr4_toggle_bits_irqsoff(unsigned long mask)
 {
        unsigned long cr4;