linux-kernel - Re: [PATCH 1/5] RISC-V: Add conditional macro for zone of DMA32

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Message-ID: <CA+ZOyahrur6+9xw6mTpMGEe2Y6S=V0f_63kzqOgAdbdTpOvqCA@mail.gmail.com>
Date:   Thu, 21 Jun 2018 15:06:12 +0800
From:   Zong Li <zongbox@...il.com>
To:     hch@...radead.org
Cc:     Zong Li <zong@...estech.com>, linux-riscv@...ts.infradead.org,
        Palmer Dabbelt <palmer@...ive.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        aou@...s.berkeley.edu, greentime@...estech.com
Subject: Re: [PATCH 1/5] RISC-V: Add conditional macro for zone of DMA32

Christoph Hellwig <hch@...radead.org> 於 2018年6月21日 週四 下午2:40寫道：
>
> On Thu, Jun 21, 2018 at 09:41:41AM +0800, Zong Li wrote:
> > The DMA32 is for 64-bit usage.
> >
> > Signed-off-by: Zong Li <zong@...estech.com>
> > ---
> >  arch/riscv/mm/init.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> > index c77df8142be2..91a5852e28fd 100644
> > --- a/arch/riscv/mm/init.c
> > +++ b/arch/riscv/mm/init.c
> > @@ -28,8 +28,11 @@ static void __init zone_sizes_init(void)
> >  {
> >       unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
> >
> > +#ifdef CONFIG_ZONE_DMA32
> >       max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn));
> > +#else
> >       max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
> > +#endif
>
> This breaks the 64-bit setup.  The second line needs to be kept for
> the CONFIG_ZONE_DMA32 case.


Yes, it should be

#ifdef CONFIG_ZONE_DMA32
    max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, max_low_pfn));
#endif
    max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

Thanks!