linux-kernel - Re: [PATCH] RISC-V: Acquire mmap lock before invoking walk_page

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Message-ID: <CANN689EXQsH3C92fe=QHVEZasWmBiMXPoOB=bRLhK2CP-hdKqQ@mail.gmail.com>
Date:   Wed, 17 Jun 2020 17:01:28 -0700
From:   Michel Lespinasse <walken@...gle.com>
To:     Atish Patra <atish.patra@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Zong Li <zong.li@...ive.com>
Subject: Re: [PATCH] RISC-V: Acquire mmap lock before invoking walk_page_range

On Wed, Jun 17, 2020 at 1:38 PM Atish Patra <atish.patra@....com> wrote:
> As per walk_page_range documentation, mmap lock should be acquired by the
> caller before invoking walk_page_range. mmap_assert_locked gets triggered
> without that. The details can be found here.
>
> http://lists.infradead.org/pipermail/linux-riscv/2020-June/010335.html
>
> Fixes: 395a21ff859c(riscv: add ARCH_HAS_SET_DIRECT_MAP support)
> Signed-off-by: Atish Patra <atish.patra@....com>

Thanks for the fix.

Reviewed-by: Michel Lespinasse <walken@...gle.com>