linux-kernel - Re: [PATCH] RISC-V: simplify BUILTIN

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Date:   Fri, 15 Jan 2021 21:18:54 +0100
From:   Vitaly Wool <vitaly.wool@...sulko.com>
To:     Anup Patel <anup@...infault.org>
Cc:     linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Damien Le Moal <damien.lemoal@....com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] RISC-V: simplify BUILTIN_DTB processing

On Fri, Jan 15, 2021 at 11:43 AM Anup Patel <anup@...infault.org> wrote:
>
> On Fri, Jan 15, 2021 at 3:18 PM Vitaly Wool <vitaly.wool@...sulko.com> wrote:
> >
> >
> >
> > On Fri, 15 Jan 2021, 10:39 Anup Patel, <anup@...infault.org> wrote:
> >>
> >> On Tue, Jan 12, 2021 at 2:51 AM Vitaly Wool <vitaly.wool@...sulko.com> wrote:
> >> >
> >> > Provide __dtb_start as a parameter to setup_vm() in case
> >> > CONFIG_BUILTIN_DTB is true, so we don't have to duplicate
> >> > BUILTIN_DTB specific processing in MMU-enabled and MMU-disabled
> >> > versions of setup_vm().
> >> >
> >> > Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.com>
> >> > ---
> >> >  arch/riscv/kernel/head.S | 4 ++++
> >> >  arch/riscv/mm/init.c     | 4 ----
> >> >  2 files changed, 4 insertions(+), 4 deletions(-)
> >> >
> >> > diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
> >> > index 16e9941900c4..f5a9bad86e58 100644
> >> > --- a/arch/riscv/kernel/head.S
> >> > +++ b/arch/riscv/kernel/head.S
> >> > @@ -260,7 +260,11 @@ clear_bss_done:
> >> >
> >> >         /* Initialize page tables and relocate to virtual addresses */
> >> >         la sp, init_thread_union + THREAD_SIZE
> >> > +#ifdef CONFIG_BUILTIN_DTB
> >> > +       la a0, __dtb_start
> >> > +#else
> >> >         mv a0, s1
> >> > +#endif /* CONFIG_BUILTIN_DTB */
> >> >         call setup_vm
> >> >  #ifdef CONFIG_MMU
> >> >         la a0, early_pg_dir
> >> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> >> > index 5b17f8d22f91..45faad7c4291 100644
> >> > --- a/arch/riscv/mm/init.c
> >> > +++ b/arch/riscv/mm/init.c
> >> > @@ -615,11 +615,7 @@ static void __init setup_vm_final(void)
> >> >  #else
> >> >  asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> >> >  {
> >> > -#ifdef CONFIG_BUILTIN_DTB
> >> > -       dtb_early_va = (void *) __dtb_start;
> >> > -#else
> >> >         dtb_early_va = (void *)dtb_pa;
> >> > -#endif
> >> >         dtb_early_pa = dtb_pa;
> >> >  }
> >> >
> >> > --
> >> > 2.20.1
> >> >
> >>
> >> We can avoid the early DTB mapping for MMU-enabled case when
> >> BUILTIN_DTB is enabled (same as previous discussion). Otherwise
> >> looks good to me.
> >
> >
> > Right, but I had already submitted the patch which takes care of that, and you have reviewed it too IIRC :)
>
> Ahh, I assumed this patch is based on latest stable Linux-5.11-rcX.
>
> Either you can create a series with two patches OR you can squash this patch
> into your previous patch.

Fair enough, I'll come up with a new (aggregate) one.

Best regards,
   Vitaly