linux-kernel - Re: [PATCH] riscv: to make sure the cores in .Lsecondary

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Message-ID: <CAHCEehLz9MfTyOPf42xPbT7FM8oO--C-hT4eVcNkXMG1vnBjmg@mail.gmail.com>
Date:   Wed, 8 Jan 2020 10:39:34 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>
Cc:     Gt <green.hu@...il.com>, greentime@...nel.org,
        Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: to make sure the cores in .Lsecondary_park

On Tue, Jan 7, 2020 at 6:54 PM Paul Walmsley <paul.walmsley@...ive.com> wrote:
>
> Hi Greentime,
>
> On Tue, 7 Jan 2020, Greentime Hu wrote:
>
> > The code in secondary_park is currently placed in the .init section.  The
> > kernel reclaims and clears this code when it finishes booting.  That
> > causes the cores parked in it to go to somewhere unpredictable, so we
> > move this function out of init to make sure the cores stay looping there.
> >
> > Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
> > ---
> >  arch/riscv/kernel/head.S | 13 ++++++++-----
> >  1 file changed, 8 insertions(+), 5 deletions(-)
> >
> > diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
> > index f8f996916c5b..d8da076fc69e 100644
> > --- a/arch/riscv/kernel/head.S
> > +++ b/arch/riscv/kernel/head.S
> > @@ -217,11 +217,6 @@ relocate:
> >       tail smp_callin
> >  #endif
> >
> > -.align 2
> > -.Lsecondary_park:
> > -     /* We lack SMP support or have too many harts, so park this hart */
> > -     wfi
> > -     j .Lsecondary_park
> >  END(_start)
> >
> >  #ifdef CONFIG_RISCV_M_MODE
> > @@ -303,6 +298,14 @@ ENTRY(reset_regs)
> >  END(reset_regs)
> >  #endif /* CONFIG_RISCV_M_MODE */
> >
> > +__FINIT
> > +.section ".text", "ax",@progbits
>
> Can the __FINIT be dropped?

Yes, Paul.
It can be dropped. I'll send v2.