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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 12:58:59 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 12:58:59 -0300
commit0520a938e11c34a5ffc422b9316b85e294b0fbb2 (patch)
tree9e44592eccb90ed2d2b3a893fb602e4ca894f695 /arch/x86/include/asm/tlbflush.h
parent273d4428f8c4cc94c9598f8bcc006ec2e8c654ea (diff)
Linux-libre 4.7.3-gnupck-4.7.3-gnu
Diffstat (limited to 'arch/x86/include/asm/tlbflush.h')
-rw-r--r--arch/x86/include/asm/tlbflush.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 4e5be94e0..6fa85944a 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -135,7 +135,14 @@ static inline void cr4_set_bits_and_update_boot(unsigned long mask)
static inline void __native_flush_tlb(void)
{
+ /*
+ * If current->mm == NULL then we borrow a mm which may change during a
+ * task switch and therefore we must not be preempted while we write CR3
+ * back:
+ */
+ preempt_disable();
native_write_cr3(native_read_cr3());
+ preempt_enable();
}
static inline void __native_flush_tlb_global_irq_disabled(void)