linux-kernel - Re: [PATCH] RISC-V: Fix usage of memblock_enforce_memory_limit

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Date:   Thu, 17 Dec 2020 00:43:37 -0800
From:   Atish Patra <atishp@...shpatra.org>
To:     Bin Meng <bmeng.cn@...il.com>
Cc:     Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup.patel@....com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH] RISC-V: Fix usage of memblock_enforce_memory_limit

On Thu, Dec 17, 2020 at 12:12 AM Bin Meng <bmeng.cn@...il.com> wrote:
>
> Hi Atish,
>
> On Thu, Dec 17, 2020 at 3:49 PM Atish Patra <atish.patra@....com> wrote:
> >
> > memblock_enforce_memory_limit accepts the maximum memory size not the last
> > address. Fix the function invocation correctly.
> >
> > Fixes: 1bd14a66ee52 ("RISC-V: Remove any memblock representing unusable memory area")
> >
> > Signed-off-by: Atish Patra <atish.patra@....com>
> > ---
> >  arch/riscv/mm/init.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
>
> Thank you for working on this.
>
> Tested with QEMU 5.2.0 on 32-bit 'virt' and 'sifive_u', with
> fw_jump.bin used as the -bios.

fw_dynamic should also work unless you are using more than 1G of memory.
Linux kernel can only support 1G of memory for RV32. The current
Kconfig is bit misleading and
I will send a patch to update the description.

However, kernel should be able to ignore any memory beyond what it can
address and continue.
I will investigate more.

> 32-bit 'virt' boots, but 32-bit 'sifive_u' still does not boot, which
> should be another issue because reverting the original 1bd14a66ee52 it
> still does not help 'sifive_u'.
>

Are you using more than 1G of memory ? Let me know if the kernel boots
if you use 1G.

> Tested-by: Bin Meng <bin.meng@...driver.com>
>
> I believe the following tag should also be added and patch cc'ed to
> stable-kernel:
>
> Reported-by: Bin Meng <bin.meng@...driver.com>
> Cc: <stable@...r.kernel.org> # 5.10
>
> Regards,
> Bin
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

-- 
Regards,
Atish

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