linux-kernel - [PATCH 0/5] Do not request a pointer kaddr when not required

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Message-Id: <20180724084510.6104-1-yehs2007@zoho.com>
Date:   Tue, 24 Jul 2018 16:45:05 +0800
From:   Huaisheng Ye <yehs2007@...o.com>
To:     linux-nvdimm@...ts.01.org, dan.j.williams@...el.com
Cc:     ross.zwisler@...ux.intel.com, willy@...radead.org,
        vishal.l.verma@...el.com, dave.jiang@...el.com,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        viro@...iv.linux.org.uk, martin.petersen@...cle.com,
        axboe@...nel.dk, gregkh@...uxfoundation.org,
        bart.vanassche@....com, jack@...e.cz, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        chengnt@...ovo.com, Huaisheng Ye <yehs1@...ovo.com>
Subject: [PATCH 0/5] Do not request a pointer kaddr when not required

From: Huaisheng Ye <yehs1@...ovo.com>

Some functions within fs/dax and dax/super don't need to get kaddr from
direct_access. Assigning NULL to kaddr to ->direct_access() is more
straightforward and simple than offering a useless local pointer.

So all direct_access() need to check the validity of second rank pointer
kaddr for NULL assignment. If kaddr equals to NULL, it doesn't need to
calculate its value.

* This series are supplement to [PATCH v2 00/14]mm: Asynchronous +
  multithreaded memmap init for ZONE_DEVICE. [1]

[1]: https://lkml.org/lkml/2018/7/16/828

Huaisheng Ye (5):
  libnvdimm, pmem: Allow a NULL-kaddr to ->direct_access()
  tools/testing/nvdimm: Allow a NULL-kaddr to ->direct_access()
  s390, dcssblk: Allow a NULL-kaddr to ->direct_access()
  filesystem-dax: Do not request a pointer kaddr when not required
  dax/super: Do not request a pointer kaddr when not required

 drivers/dax/super.c             | 3 +--
 drivers/nvdimm/pmem.c           | 4 +++-
 drivers/s390/block/dcssblk.c    | 3 ++-
 fs/dax.c                        | 3 +--
 tools/testing/nvdimm/pmem-dax.c | 6 ++++--
 5 files changed, 11 insertions(+), 8 deletions(-)

-- 
1.8.3.1