linux-kernel - RE: [External] [PATCH v3 0/6] kaddr and pfn can be NULL to ->direct

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Date:   Mon, 30 Jul 2018 07:30:07 +0000
From:   Huaisheng HS1 Ye <yehs1@...ovo.com>
To:     Huaisheng Ye <yehs2007@...o.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>
CC:     "ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "vishal.l.verma@...el.com" <vishal.l.verma@...el.com>,
        "dave.jiang@...el.com" <dave.jiang@...el.com>,
        "schwidefsky@...ibm.com" <schwidefsky@...ibm.com>,
        "heiko.carstens@...ibm.com" <heiko.carstens@...ibm.com>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "bart.vanassche@....com" <bart.vanassche@....com>,
        "jack@...e.cz" <jack@...e.cz>, "agk@...hat.com" <agk@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "colyli@...e.de" <colyli@...e.de>,
        "NingTing Cheng" <chengnt@...ovo.com>
Subject: RE: [External]  [PATCH v3 0/6] kaddr and pfn can be NULL to
 ->direct_access()

Missing one in changes log.

> From: Huaisheng Ye <yehs2007@...o.com>
> Sent: Monday, July 30, 2018 3:16 PM
> 
> From: Huaisheng Ye <yehs1@...ovo.com>
> 
> Changes since v2 [2]:
> * Collect Martin and Mike's acks for dcssblk and dm-writecache;
> * Rebase the series of patch to v4.18-rc7.
* Collect Ross's reviewed-by for series.

> 
> Changes since v1 [1]:
> * Involve the previous patches for pfn can be NULL.
> * Reword the patch descriptions according to Christian's comment.
> * According to Ross's suggestion, replace local pointer dummy_addr
>   with NULL within md/dm-writecache for direct_access.
> 
> [1]: https://lkml.org/lkml/2018/7/24/199
> [2]: https://lkml.org/lkml/2018/7/25/581
> 
> Some functions within fs/dax, dax/super and md/dm-writecache don't
> need to get local pointer kaddr or variable pfn from direct_access.
> Assigning NULL to kaddr or pfn with ->direct_access() is more
> straightforward and simple than offering a useless local pointer or
> variable.
> 
> So all ->direct_access() need to check the validity of pointer kaddr
> and pfn for NULL assignment. If either of them is equal to NULL, that
> is to say callers may have no need for kaddr or pfn, so this series of
> patch are prepared for allowing them to pass in NULL instead of having
> to pass in a local pointer or variable that they then just throw away.
> 
> Huaisheng Ye (6):
>   libnvdimm, pmem: kaddr and pfn can be NULL to ->direct_access()
>   s390, dcssblk: kaddr and pfn can be NULL to ->direct_access()
>   tools/testing/nvdimm: kaddr and pfn can be NULL to ->direct_access()
>   dax/super: Do not request a pointer kaddr when not required
>   md/dm-writecache: Don't request pointer dummy_addr when not required
>   filesystem-dax: Do not request kaddr and pfn when not required
> 
>  drivers/dax/super.c             |  3 +--
>  drivers/md/dm-writecache.c      |  3 +--
>  drivers/nvdimm/pmem.c           |  7 +++++--
>  drivers/s390/block/dcssblk.c    |  8 +++++---
>  fs/dax.c                        | 13 ++++---------
>  tools/testing/nvdimm/pmem-dax.c | 12 ++++++++----
>  6 files changed, 24 insertions(+), 22 deletions(-)
> 
> --
> 1.8.3.1
>