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    Subject[PATCH 3/3] MIPS: Do not call flush_tlb_all when setting pmd entry
    Date
    Function set_pmd_at is to set pmd entry, if tlb entry need to
    be flushed, there exists pmdp_huge_clear_flush alike function
    before set_pmd_at is called. So it is not necessary to call
    flush_tlb_all in this function.

    In these scenarios, tlb for the pmd range needs to be flushed:
    1. privilege degrade such as wrprotect is set on the pmd entry
    2. pmd entry is cleared
    3. there is exception if set_pmd_at is issued by dup_mmap, since
    flush_tlb_mm is called for parent process, it is not necessary
    to flush tlb in function copy_huge_pmd.

    Signed-off-by: Bibo Mao <maobibo@loongson.cn>
    ---
    arch/mips/mm/pgtable-32.c | 1 -
    arch/mips/mm/pgtable-64.c | 1 -
    2 files changed, 2 deletions(-)

    diff --git a/arch/mips/mm/pgtable-32.c b/arch/mips/mm/pgtable-32.c
    index bd4b065..61891af 100644
    --- a/arch/mips/mm/pgtable-32.c
    +++ b/arch/mips/mm/pgtable-32.c
    @@ -45,7 +45,6 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
    pmd_t *pmdp, pmd_t pmd)
    {
    *pmdp = pmd;
    - flush_tlb_all();
    }
    #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */

    diff --git a/arch/mips/mm/pgtable-64.c b/arch/mips/mm/pgtable-64.c
    index 183ff9f..7536f78 100644
    --- a/arch/mips/mm/pgtable-64.c
    +++ b/arch/mips/mm/pgtable-64.c
    @@ -100,7 +100,6 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr,
    pmd_t *pmdp, pmd_t pmd)
    {
    *pmdp = pmd;
    - flush_tlb_all();
    }

    void __init pagetable_init(void)
    --
    1.8.3.1
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