Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/mips/include/asm/tlbflush.h b/arch/mips/include/asm/tlbflush.h
index 40a3610..9789e7a 100644
--- a/arch/mips/include/asm/tlbflush.h
+++ b/arch/mips/include/asm/tlbflush.h
@@ -14,7 +14,6 @@
  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  */
 extern void local_flush_tlb_all(void);
-extern void local_flush_tlb_mm(struct mm_struct *mm);
 extern void local_flush_tlb_range(struct vm_area_struct *vma,
 	unsigned long start, unsigned long end);
 extern void local_flush_tlb_kernel_range(unsigned long start,
@@ -23,6 +22,8 @@
 	unsigned long page);
 extern void local_flush_tlb_one(unsigned long vaddr);
 
+#include <asm/mmu_context.h>
+
 #ifdef CONFIG_SMP
 
 extern void flush_tlb_all(void);
@@ -36,7 +37,7 @@
 #else /* CONFIG_SMP */
 
 #define flush_tlb_all()			local_flush_tlb_all()
-#define flush_tlb_mm(mm)		local_flush_tlb_mm(mm)
+#define flush_tlb_mm(mm)		drop_mmu_context(mm)
 #define flush_tlb_range(vma, vmaddr, end)	local_flush_tlb_range(vma, vmaddr, end)
 #define flush_tlb_kernel_range(vmaddr,end) \
 	local_flush_tlb_kernel_range(vmaddr, end)