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Subject回复:[PATCH] riscv: fix pfn to virt err in do page fault().
Hi Christoph,
> On Thu, Sep 17, 2020 at 03:25:49PM +0800, liush wrote:
> > 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 | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
> > index 716d64e..9b4e088 100644
> > --- a/arch/riscv/mm/fault.c
> > +++ b/arch/riscv/mm/fault.c
> > @@ -212,7 +212,7 @@ 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;
> > + pgd = (pgd_t *)pfn_to_virt(csr_read(CSR_SATP) & SATP_PPN) + index;

> This adds a crazy long line. One nice way to clean this up would be to
> add a local pfn variable, as it would also make the code more readable.

Thanks, i'll modify it in next revision
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