linux-kernel - Re: [PATCH] mips: define pud_index() regardless of page table folding

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Date:   Thu, 16 Apr 2020 18:35:21 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
        maobibo <maobibo@...ngson.cn>,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        linux-mips@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH] mips: define pud_index() regardless of page table folding

On Thu, Apr 02, 2020 at 11:16:14AM +0300, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> Commit 31168f033e37 ("mips: drop __pXd_offset() macros that duplicate
> pXd_index() ones") is correct that pud_index() & __pud_offset() are the
> same when pud_index() is actually provided, however it does not take into
> account the __PAGETABLE_PUD_FOLDED case. This has broken MIPS KVM
> compilation because it relied on availability of pud_index().
> 
> Define pud_index() regardless of page table folded. It will evaluate to
> actual index for 4-level pagetables and to 0 for folded PUD level.
> 
> Link: https://lore.kernel.org/lkml/20200331154749.5457-1-pbonzini@redhat.com
> Reported-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>  arch/mips/include/asm/pgtable-64.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]