| Message ID | 1592477815-836-1-git-send-email-maobibo@loongson.cn (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] MIPS: Do not flush tlb when setting pmd entry | expand |
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)
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> --- v2: - add the same operation on mips32 system - update changelog description --- arch/mips/mm/pgtable-32.c | 1 - arch/mips/mm/pgtable-64.c | 1 - 2 files changed, 2 deletions(-)