From: liush <liush@allwinnertech.com>
To: paul.walmsley@sifive.com, palmer@dabbelt.com,
aou@eecs.berkeley.edu, akpm@linux-foundation.org,
peterx@redhat.com, daniel.m.jordan@oracle.com, walken@google.com,
vbabka@suse.cz, rppt@kernel.org
Cc: liush <liush@allwinnertech.com>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [V2] riscv: fix pfn_to_virt err in do_page_fault().
Date: Fri, 18 Sep 2020 16:55:58 +0800 [thread overview]
Message-ID: <1600419358-21446-1-git-send-email-liush@allwinnertech.com> (raw)
The argument to pfn_to_virt() should be pfn not the value of CSR_SATP.
Signed-off-by: liush <liush@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 716d64e..3e560ec13 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -198,6 +198,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
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))
@@ -212,7 +213,8 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
* 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
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next reply other threads:[~2020-09-18 8:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 8:55 liush [this message]
2020-09-27 0:35 ` [V2] riscv: fix pfn_to_virt err in do_page_fault() Palmer Dabbelt
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