linux-kernel - Re: [PATCH 3/3] fs/dax: Assigning NULL to gfn of dax_direct

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Message-ID: <CAPcyv4hPEch02C7UfCGgpXmsCVyT2zwV=4Tr8jv8W1i6_poAJQ@mail.gmail.com>
Date:   Wed, 4 Jul 2018 07:37:40 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     yehs2007@...o.com
Cc:     Jan Kara <jack@...e.cz>, linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Jens Axboe <axboe@...nel.dk>,
        Greg KH <gregkh@...uxfoundation.org>,
        Bart Van Assche <bart.vanassche@....com>,
        Jan Kara <jack@...e.com>, NingTing Cheng <chengnt@...ovo.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Huaisheng Ye <yehs1@...ovo.com>, colyli <colyli@...e.de>
Subject: Re: [PATCH 3/3] fs/dax: Assigning NULL to gfn of dax_direct_access if useless

On Wed, Jul 4, 2018 at 6:07 AM, Huaisheng Ye <yehs2007@...o.com> wrote:
>  ---- On Wed, 04 Jul 2018 19:30:12 +0800 Jan Kara <jack@...e.cz> wrote ----
>  > On Wed 04-07-18 14:40:58, Huaisheng Ye wrote:
>  > > From: Huaisheng Ye <yehs1@...ovo.com>
>  > >
>  > > Some functions within fs/dax don't need to get gfn from direct_access.
>  > > Assigning NULL to gfn of dax_direct_access is more intuitive and simple
>  > > than offering a useless local variable.
>  > >
>  > > Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
>  >
>  > I like this. You can add:
>  >
>  > Reviewed-by: Jan Kara <jack@...e.cz>
>  >
>  > for the series.
>  >
>  >                                 Honza
>  >
> I am so happy you like them, thank you very much.

Yes, I like this too. In fact I have a similar patch in my tree
already that I have been preparing to send out. I am using it to delay
when we need to have the 'struct page' memmap for dax initialized.
Attached is the full patch, but the series is still a work in
progress.

View attachment "0001-dax-Elide-pfn-lookups.patch" of type "text/x-patch" (6511 bytes)