From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id 4BFB86B0280 for ; Fri, 9 Feb 2018 19:38:35 -0500 (EST) Received: by mail-pg0-f70.google.com with SMTP id 202so4883772pgb.13 for ; Fri, 09 Feb 2018 16:38:35 -0800 (PST) Received: from mga01.intel.com (mga01.intel.com. [192.55.52.88]) by mx.google.com with ESMTPS id f7si2012350pgn.183.2018.02.09.16.38.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Feb 2018 16:38:34 -0800 (PST) Subject: [PATCH v2 2/2] device-dax: implement ->pagesize() for smaps to report MMUPageSize From: Dave Jiang Date: Fri, 09 Feb 2018 17:38:32 -0700 Message-ID: <151822311257.52376.12067958018820885784.stgit@djiang5-desk3.ch.intel.com> In-Reply-To: <151822289999.52376.4998780583577188804.stgit@djiang5-desk3.ch.intel.com> References: <151822289999.52376.4998780583577188804.stgit@djiang5-desk3.ch.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org Cc: Jane Chu , linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, mhocko@kernel.org, linux-mm@kvack.org, dan.j.williams@intel.com From: Dan Williams Given that device-dax is making similar page mapping size guarantees as hugetlbfs, emit the size in smaps and any other kernel path that requests the mapping size of a vma. Reported-by: Jane Chu Signed-off-by: Dan Williams --- drivers/dax/device.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/dax/device.c b/drivers/dax/device.c index 7b0bf825c4e7..b57cd5a7b0bd 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -439,10 +439,20 @@ static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr) return 0; } +static unsigned long dev_dax_pagesize(struct vm_area_struct *vma) +{ + struct file *filp = vma->vm_file; + struct dev_dax *dev_dax = filp->private_data; + struct dax_region *dax_region = dev_dax->region; + + return dax_region->align; +} + static const struct vm_operations_struct dax_vm_ops = { .fault = dev_dax_fault, .huge_fault = dev_dax_huge_fault, .split = dev_dax_split, + .pagesize = dev_dax_pagesize, }; static int dax_mmap(struct file *filp, struct vm_area_struct *vma) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org