nios2: update_mmu_cache preload the TLB with the new PTE

Rather than flush the TLB entry when installing a new PTE to allow
the fast TLB reload to re-fill the TLB, just refill the TLB entry
when removing the old one.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>

arch/nios2/include/asm/tlbflush.h

@@ -30,6 +30,9 @@ struct mm_struct;
  *  - flush_tlb_page(vma, address) flushes a page
  *  - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
  *  - flush_tlb_kernel_page(address) flushes a kernel page
+ *
+ *  - reload_tlb_page(vma, address, pte) flushes the TLB for address like
+ *    flush_tlb_page, then replaces it with a TLB for pte.
  */
 extern void flush_tlb_all(void);
 extern void flush_tlb_mm(struct mm_struct *mm);
@@ -48,4 +51,7 @@ static inline void flush_tlb_kernel_page(unsigned long address)
 	flush_tlb_kernel_range(address, address + PAGE_SIZE);
 }
 
+extern void reload_tlb_page(struct vm_area_struct *vma, unsigned long addr,
+			    pte_t pte);
+
 #endif /* _ASM_NIOS2_TLBFLUSH_H */