[PATCH v7 1/4] MIPS: Do not flush tlb page when updating PTE entry

From: Bibo Mao
Date: Tue May 26 2020 - 22:26:19 EST

It is not necessary to flush tlb page on all CPUs if suitable PTE
entry exists already during page fault handling, just updating
TLB is fine.

Here redefine flush_tlb_fix_spurious_fault as empty on MIPS system.

Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
arch/mips/include/asm/pgtable.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 9b01d2d..f8f48fc 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -478,6 +478,11 @@ static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
return __pgprot(prot);

+static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
+ unsigned long address)
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.