linux-kernel - Re: [PATCH v4 1/2] mm/hmm: make full use of walk_page

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Message-ID: <20191114142409.GA785@ziepe.ca>
Date:   Thu, 14 Nov 2019 10:24:09 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>, Shuah Khan <shuah@...nel.org>,
        linux-rdma@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 1/2] mm/hmm: make full use of walk_page_range()

On Mon, Nov 04, 2019 at 02:21:40PM -0800, Ralph Campbell wrote:
> hmm_range_fault() calls find_vma() and walk_page_range() in a loop.
> This is unnecessary duplication since walk_page_range() calls find_vma()
> in a loop already.
> Simplify hmm_range_fault() by defining a walk_test() callback function
> to filter unhandled vmas.
> This also fixes a bug where hmm_range_fault() was not checking
> start >= vma->vm_start before checking vma->vm_flags so hmm_range_fault()
> could return an error based on the wrong vma for the requested range.
> It also fixes a bug when the vma has no read access and the caller did
> not request a fault, there shouldn't be any error return code.
> 
> Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
> Cc: "Jérôme Glisse" <jglisse@...hat.com>
> Cc: Jason Gunthorpe <jgg@...lanox.com>
> Cc: Christoph Hellwig <hch@....de>
> Reviewed-by: Christoph Hellwig <hch@....de>
> ---
>  mm/hmm.c | 121 ++++++++++++++++++++++++++-----------------------------
>  1 file changed, 58 insertions(+), 63 deletions(-)

Applied to hmm.git with Christoph's hunk merged in

Thanks,
Jason