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

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Message-ID: <CAEEQ3w=S=Gn9qER=qNwUn8+Gs9AN4Y5-0Zg0w8-4Vps4L7n97w@mail.gmail.com>
Date: Wed, 18 Sep 2024 11:49:27 +0800
From: yunhui cui <cuiyunhui@...edance.com>
To: Alexandre Ghiti <alex@...ti.fr>
Cc: punit.agrawal@...edance.com, paul.walmsley@...ive.com, palmer@...belt.com, 
	aou@...s.berkeley.edu, alexghiti@...osinc.com, chenjiahao16@...wei.com, 
	guoren@...nel.org, vishal.moola@...il.com, stuart.menefy@...asip.com, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [PATCH] riscv: add a warning when physical memory
 address overflows

Hi Palmer,

A gentle ping for this patch.

On Thu, Aug 15, 2024 at 7:01 PM Alexandre Ghiti <alex@...ti.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@...edance.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@...osinc.com>
>
> Tested-by: Alexandre Ghiti <alexghiti@...osinc.com>
>
> Thanks,
>
> Alex
>

Thanks,
Yunhui