From 7da9ca3f5b1e435eddcf539d60c0975d98dfa4b9 Mon Sep 17 00:00:00 2001 From: Chuanhua Han Date: Thu, 31 Mar 2022 19:43:20 -0700 Subject: riscv: mm: Remove the copy operation of pmd Since all processes share the kernel address space, we only need to copy pgd in case of a vmalloc page fault exception, the other levels of page tables are shared, so the operation of copying pmd is unnecessary. Signed-off-by: Chuanhua Han Signed-off-by: Palmer Dabbelt --- arch/riscv/mm/fault.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) (limited to 'arch/riscv') diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 4e9efbe46d5f..40694f0cab9e 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -102,9 +102,9 @@ static inline void bad_area(struct pt_regs *regs, struct mm_struct *mm, int code static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long addr) { pgd_t *pgd, *pgd_k; - pud_t *pud, *pud_k; - p4d_t *p4d, *p4d_k; - pmd_t *pmd, *pmd_k; + pud_t *pud_k; + p4d_t *p4d_k; + pmd_t *pmd_k; pte_t *pte_k; int index; unsigned long pfn; @@ -132,14 +132,12 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a } set_pgd(pgd, *pgd_k); - p4d = p4d_offset(pgd, addr); p4d_k = p4d_offset(pgd_k, addr); if (!p4d_present(*p4d_k)) { no_context(regs, addr); return; } - pud = pud_offset(p4d, addr); pud_k = pud_offset(p4d_k, addr); if (!pud_present(*pud_k)) { no_context(regs, addr); @@ -150,13 +148,11 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a * Since the vmalloc area is global, it is unnecessary * to copy individual PTEs */ - pmd = pmd_offset(pud, addr); pmd_k = pmd_offset(pud_k, addr); if (!pmd_present(*pmd_k)) { no_context(regs, addr); return; } - set_pmd(pmd, *pmd_k); /* * Make sure the actual PTE exists as well to -- cgit v1.2.3