linux-kernel - Re: [PATCH v11 07/22] riscv: mm: Add p?d

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Date:   Tue, 8 Oct 2019 14:33:48 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Steven Price <steven.price@....com>, alex@...ti.fr
cc:     linux-mm@...ck.org, Mark Rutland <Mark.Rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-riscv@...ts.infradead.org,
        Will Deacon <will@...nel.org>,
        "Liang, Kan" <kan.liang@...ux.intel.com>, x86@...nel.org,
        Ingo Molnar <mingo@...hat.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v11 07/22] riscv: mm: Add p?d_leaf() definitions

On Mon, 7 Oct 2019, Steven Price wrote:

> walk_page_range() is going to be allowed to walk page tables other than
> those of user space. For this it needs to know when it has reached a
> 'leaf' entry in the page tables. This information is provided by the
> p?d_leaf() functions/macros.
> 
> For riscv a page is a leaf page when it has a read, write or execute bit
> set on it.
> 
> CC: Palmer Dabbelt <palmer@...ive.com>
> CC: Albert Ou <aou@...s.berkeley.edu>
> CC: linux-riscv@...ts.infradead.org
> Signed-off-by: Steven Price <steven.price@....com>

Acked-by: Paul Walmsley <paul.walmsley@...ive.com> # for arch/riscv  

Alex has a good point, but probably the right thing to do is to replace 
the contents of the arch/riscv/mm/hugetlbpage.c p{u,m}d_huge() functions 
with calls to Steven's new static inline functions.


- Paul