linux-kernel - Re: [RESEND PATCH V3 2/2] riscv: add RISC-V Svpbmt extension supports

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Date:   Sun, 7 Nov 2021 14:54:47 +0800
From:   Wei Fu <wefu@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Anup Patel <anup.patel@....com>,
        Atish Patra <atish.patra@....com>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>, guoren@...nel.org,
        christoph.muellner@...ll.eu,
        Philipp Tomsich <philipp.tomsich@...ll.eu>,
        Liu Shaohua <liush@...winnertech.com>,
        Wei Wu (吴伟) <lazyparser@...il.com>,
        Drew Fustini <drew@...gleboard.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        taiten.peng@...onical.com, aniket.ponkshe@...onical.com,
        heinrich.schuchardt@...onical.com, gordan.markus@...onical.com,
        guoren@...ux.alibaba.com, Arnd Bergmann <arnd@...db.de>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime@...no.tech>,
        Daniel Lustig <dlustig@...dia.com>,
        Greg Favor <gfavor@...tanamicro.com>,
        Andrea Mondelli <andrea.mondelli@...wei.com>,
        Jonathan Behrens <behrensj@....edu>,
        Xinhaoqu <xinhaoqu@...wei.com>,
        Bill Huffman <huffman@...ence.com>,
        Nick Kossifidis <mick@....forth.gr>,
        Allen Baum <allen.baum@...erantotech.com>,
        Josh Scheid <jscheid@...tanamicro.com>,
        Richard Trauben <rtrauben@...il.com>
Subject: Re: [RESEND PATCH V3 2/2] riscv: add RISC-V Svpbmt extension supports

Hi Christoph,

Great thanks for your review.

On Tue, Nov 2, 2021 at 2:04 PM Christoph Hellwig <hch@....de> wrote:
>
> On Mon, Oct 25, 2021 at 10:49:11PM +0800, Wei Fu wrote:
> > > > +                                             >> _PAGE_PFN_SHIFT);
> > >
> > > >  static inline unsigned long _pmd_pfn(pmd_t pmd)
> > > >  {
> > > > -     return pmd_val(pmd) >> _PAGE_PFN_SHIFT;
> > > > +     return (pmd_val(pmd) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT;
> > > >  }
> > >
> > > The "(pud_val(pud) & _PAGE_CHG_MASK) >> _PAGE_PFN_SHIFT" expression begs
> > > for readable and well-documented helper.
> >
> > How about these:
> > #define _chg_of_pmd(pmd)  (pmd_val(pmd) & _PAGE_CHG_MASK)
> > #define _chg_of_pud(pud)  (pud_val(pud) & _PAGE_CHG_MASK)
>
> I'd use inline functions instead of macros if possible, but otherwise
> yes.

Great thanks for your suggestion,  I will change this to inline :-)


>
> > How about :
> >
> > extern unsigned long  _svpbmt_mask
> > extern unsigned long _svpbmt_mt_pma
> > extern unsigned long _svpbmt_mt_nc
> > extern unsigned long _svpbmt_mt_io
> >
> > #define _PAGE_MT_MASK              _svpbmt_mask
> > #define _PAGE_MT_PMA        _svpbmt_mt_pma
> > #define _PAGE_MT_NC          _svpbmt_mt_nc
> > #define _PAGE_MT_IO           _svpbmt_mt_io
>
> Looks much better.
Thanks , will do this way

>