linux-kernel - Re: [PATCH 2/2] xtensa: get rid of __ARCH_USE_5LEVEL

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Date:   Thu, 14 Nov 2019 09:04:06 +0100
From:   Mike Rapoport <rppt@...nel.org>
To:     Max Filippov <jcmvbkbc@...il.com>
Cc:     Chris Zankel <chris@...kel.net>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH 2/2] xtensa: get rid of __ARCH_USE_5LEVEL_HACK

On Wed, Nov 13, 2019 at 12:30:39PM -0800, Max Filippov wrote:
> Hi Mike,
> 
> On Tue, Nov 5, 2019 at 6:33 AM Mike Rapoport <rppt@...nel.org> wrote:
> >
> > From: Mike Rapoport <rppt@...ux.ibm.com>
> >
> > xtensa has 2-level page tables and already uses pgtable-nopmd for page
> > table folding.
> >
> > Add walks of p4d level where appropriate and drop usage of
> > __ARCH_USE_5LEVEL_HACK.
> >
> > Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> > ---
> >  arch/xtensa/include/asm/pgtable.h |  1 -
> >  arch/xtensa/mm/fault.c            | 10 ++++++++--
> >  arch/xtensa/mm/kasan_init.c       |  6 ++++--
> >  arch/xtensa/mm/mmu.c              |  3 ++-
> >  arch/xtensa/mm/tlb.c              |  5 ++++-
> >  5 files changed, 18 insertions(+), 7 deletions(-)
> 
> This change missed a spot in arch/xtensa/include/asm/fixmap.h.
> I've added the following hunk and queued both patches to the xtensa tree:

Thanks!
 
> diff --git a/arch/xtensa/include/asm/fixmap.h b/arch/xtensa/include/asm/fixmap.h
> index 7e25c1b50ac0..cfb8696917e9 100644
> --- a/arch/xtensa/include/asm/fixmap.h
> +++ b/arch/xtensa/include/asm/fixmap.h
> @@ -78,8 +78,10 @@ static inline unsigned long virt_to_fix(const
> unsigned long vaddr)
> 
>  #define kmap_get_fixmap_pte(vaddr) \
>         pte_offset_kernel( \
> -               pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), \
> -               (vaddr) \
> -       )
> +               pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), \
> +                                                (vaddr)), \
> +                                     (vaddr)), \
> +                          (vaddr)), \
> +               (vaddr))
> 
>  #endif
> 
> 
> -- 
> Thanks.
> -- Max

-- 
Sincerely yours,
Mike.