From: Huaisheng Ye Subject: [PATCH v3 4/6] dax/super: Do not request a pointer kaddr when not required Date: Mon, 30 Jul 2018 15:15:46 +0800 Message-ID: <20180730071548.9172-5-yehs2007@zoho.com> References: <20180730071548.9172-1-yehs2007@zoho.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180730071548.9172-1-yehs2007-ytc+IHgoah0@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org Cc: jack-AlSwsSmVLrQ@public.gmane.org, snitzer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, heiko.carstens-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org, dm-devel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, agk-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, linux-s390-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, willy-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, bart.vanassche-Sjgp3cTcYWE@public.gmane.org, keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org, chengnt-6jq1YtArVR3QT0dZR+AlfA@public.gmane.org, colyli-l3A5Bk7waGM@public.gmane.org, schwidefsky-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org, viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org, axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org, gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: dm-devel.ids From: Huaisheng Ye Function __bdev_dax_supported doesn't need to get local pointer kaddr from direct_access. Using NULL instead of having to pass in a useless local pointer that caller then just throw away. Signed-off-by: Huaisheng Ye Reviewed-by: Ross Zwisler --- drivers/dax/super.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 45276ab..6e928f3 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -89,7 +89,6 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize) struct request_queue *q; pgoff_t pgoff; int err, id; - void *kaddr; pfn_t pfn; long len; char buf[BDEVNAME_SIZE]; @@ -122,7 +121,7 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize) } id = dax_read_lock(); - len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); + len = dax_direct_access(dax_dev, pgoff, 1, NULL, &pfn); dax_read_unlock(id); put_dax(dax_dev); -- 1.8.3.1