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riscv: fix pfn_to_virt err in do_page_fault().

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

Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: liush <liush@allwinnertech.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Liu Shaohua 2020-10-26 20:26:54 +08:00 committed by Palmer Dabbelt
parent 79605f1394
commit bcacf5f6f2
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1 changed files with 3 additions and 1 deletions
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arch/riscv/mm/fault.c
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@ -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)) {