Messages in this thread Patch in this message | | | From | Chuanhua Han <> | Subject | [PATCH] riscv: mm: Remove the copy operation of pmd | Date | Mon, 30 Mar 2020 19:53:19 +0800 |
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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 <hanchuanhua@fishsemi.com> --- arch/riscv/mm/fault.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index be84e32adc4c..24f4ebfd2df8 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -208,9 +208,9 @@ asmlinkage void do_page_fault(struct pt_regs *regs) vmalloc_fault: { 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; @@ -234,12 +234,10 @@ asmlinkage void do_page_fault(struct pt_regs *regs) goto no_context; set_pgd(pgd, *pgd_k); - p4d = p4d_offset(pgd, addr); p4d_k = p4d_offset(pgd_k, addr); if (!p4d_present(*p4d_k)) goto no_context; - pud = pud_offset(p4d, addr); pud_k = pud_offset(p4d_k, addr); if (!pud_present(*pud_k)) goto no_context; @@ -248,11 +246,9 @@ asmlinkage void do_page_fault(struct pt_regs *regs) * 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)) goto no_context; - set_pmd(pmd, *pmd_k); /* * Make sure the actual PTE exists as well to -- 2.17.1
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