Commit 7da9ca3f authored by Chuanhua Han's avatar Chuanhua Han Committed by Palmer Dabbelt

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: default avatarChuanhua Han <hanchuanhua@oppo.com>
Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 31231092
......@@ -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
......
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