[PATCH v3] riscv: fix pfn_to_virt err in do_page_fault().

[liush]

From: Liu Shaohua <li...@allwinnertech.com>

The argument to pfn_to_virt() should be pfn not the value of CSR_SATP.

Reviewed-by: Palmer Dabbelt <palmerdabb...@google.com>
Reviewed-by: Anup Patel <a...@brainfault.org>
Signed-off-by: liush <li...@allwinnertech.com>
---
 arch/riscv/mm/fault.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 1359e21..3c8b9e4 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -86,6 +86,7 @@ static inline void vmalloc_fault(struct pt_regs *regs, int 
code, unsigned long a
        pmd_t *pmd, *pmd_k;
        pte_t *pte_k;
        int index;
+       unsigned long pfn;
 
        /* User mode accesses just cause a SIGSEGV */
        if (user_mode(regs))
@@ -100,7 +101,8 @@ static inline void vmalloc_fault(struct pt_regs *regs, int 
code, unsigned long a
         * of a task switch.
         */
        index = pgd_index(addr);
-       pgd = (pgd_t *)pfn_to_virt(csr_read(CSR_SATP)) + index;
+       pfn = csr_read(CSR_SATP) & SATP_PPN;
+       pgd = (pgd_t *)pfn_to_virt(pfn) + index;
        pgd_k = init_mm.pgd + index;
 
        if (!pgd_present(*pgd_k)) {
-- 
2.7.4