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SubjectRe: 回复:[PATCH ] riscv: fix pfn_to_virt err in do_page_fault().
On Fri, Sep 18, 2020 at 03:43:39PM +0800, 刘邵华BTD wrote:
> 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

Tested-by: fuayo@allwinnertech.com

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<http://www.allwinnertech.com> Allwinnertech Technology


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