[External] Re: [PATCH] riscv: add a warning when physical memory address overflows

[yunhui cui]

Hi Palmer,

A gentle ping for this patch.

On Thu, Aug 15, 2024 at 7:01 PM Alexandre Ghiti <alex at ghiti.fr> wrote:
>
> Hi Yunhui,
>
> On 14/08/2024 08:26, Yunhui Cui wrote:
> > The part of physical memory that exceeds the size of the linear mapping
> > will be discarded. When the system starts up normally, a warning message
> > will be printed to prevent confusion caused by the mismatch between the
> > system memory and the actual physical memory.
> >
> > Signed-off-by: Yunhui Cui <cuiyunhui at bytedance.com>
> > ---
> >   arch/riscv/mm/init.c | 8 ++++++--
> >   1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> > index 52290c9bd04bd..c93164dc51658 100644
> > --- a/arch/riscv/mm/init.c
> > +++ b/arch/riscv/mm/init.c
> > @@ -236,8 +236,12 @@ static void __init setup_bootmem(void)
> >        */
> >       if (IS_ENABLED(CONFIG_64BIT)) {
> >               max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE;
> > -             memblock_cap_memory_range(phys_ram_base,
> > -                                       max_mapped_addr - phys_ram_base);
> > +             if (memblock_end_of_DRAM() > max_mapped_addr) {
> > +                     memblock_cap_memory_range(phys_ram_base,
> > +                                               max_mapped_addr - phys_ram_base);
> > +                     pr_warn("Physical memory overflows the linear mapping size: region above 0x%llx removed",
> > +                             max_mapped_addr);
> > +             }
> >       }
> >
> >
>
>
> A bit weird to review and test my own patch, but here it is anyway :)
>
> Reviewed-by: Alexandre Ghiti <alexghiti at rivosinc.com>
>
> Tested-by: Alexandre Ghiti <alexghiti at rivosinc.com>
>
> Thanks,
>
> Alex
>

Thanks,
Yunhui