linux-kernel - Re: [PATCH -fixes V2] riscv: mm: remove redundant parameter of create_fdt_early_page

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Date:   Thu, 27 Apr 2023 10:22:08 +0000
From:   Song Shuai <suagrfillet@...il.com>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, alexghiti@...osinc.com, heiko@...ech.de,
        guoren@...nel.org, anshuman.khandual@....com, mick@....forth.gr,
        samuel@...lland.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -fixes V2] riscv: mm: remove redundant parameter of create_fdt_early_page_table

Conor Dooley <conor.dooley@...rochip.com> 于2023年4月27日周四 10:15写道：
>
> On Wed, Apr 26, 2023 at 06:00:09PM +0800, Song Shuai wrote:
> > create_fdt_early_page_table() explicitly uses early_pg_dir for
> > 32-bit fdt mapping and the pgdir parameter is redundant here.
> > So remove it and its caller.
> >
> > Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
> > Signed-off-by: Song Shuai <suagrfillet@...il.com>
>
> Whoops, I missed the v2, so copy-pasting:
>
> "and its caller" sounds like you're removing the caller itself when
> that's not what you're doing!
> I am certainly not suggesting that you resubmit because of that though.
>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
>
> Automation failed to apply this which is a bit weird. What was the
> base-commit?
commit 1b50f956c8fe `riscv: No need to relocate the dtb as it lies in
the fixmap region` in riscv/linux fixes branch.
>
> Cheers,
> Conor.
>
> > ---
> > Changes in V1:
> > https://lore.kernel.org/linux-riscv/83540cb1-0c9b-f572-849a-cb100437d049@ghiti.fr/T/#t
> > - fix the typo
> > ---
> >  arch/riscv/mm/init.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
> > index 0f14f4a8d179..6ebb75a9a6b9 100644
> > --- a/arch/riscv/mm/init.c
> > +++ b/arch/riscv/mm/init.c
> > @@ -843,8 +843,7 @@ static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
> >   * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
> >   * entry.
> >   */
> > -static void __init create_fdt_early_page_table(pgd_t *pgdir,
> > -                                            uintptr_t fix_fdt_va,
> > +static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va,
> >                                              uintptr_t dtb_pa)
> >  {
> >       uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
> > @@ -1034,8 +1033,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
> >       create_kernel_page_table(early_pg_dir, true);
> >
> >       /* Setup early mapping for FDT early scan */
> > -     create_fdt_early_page_table(early_pg_dir,
> > -                                 __fix_to_virt(FIX_FDT), dtb_pa);
> > +     create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa);
> >
> >       /*
> >        * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
> > --
> > 2.20.1
> >



-- 
Thanks,
Song