From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=8ITv=DH=lists.01.org=linux-nvdimm-bounces@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00,DKIM_INVALID,
	DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,
	NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,
	USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 40FDFC4727E
	for <linux-nvdimm@archiver.kernel.org>; Wed, 30 Sep 2020 16:20:00 +0000 (UTC)
Received: from ml01.01.org (ml01.01.org [198.145.21.10])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id C97F620708
	for <linux-nvdimm@archiver.kernel.org>; Wed, 30 Sep 2020 16:19:59 +0000 (UTC)
Authentication-Results: mail.kernel.org;
	dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="iSobk10Q"
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C97F620708
Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com
Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvdimm-bounces@lists.01.org
Received: from ml01.vlan13.01.org (localhost [IPv6:::1])
	by ml01.01.org (Postfix) with ESMTP id 58CEC154CE715;
	Wed, 30 Sep 2020 09:19:59 -0700 (PDT)
Received-SPF: Pass (mailfrom) identity=mailfrom; client-ip=216.205.24.124; helo=us-smtp-delivery-124.mimecast.com; envelope-from=david@redhat.com; receiver=<UNKNOWN> 
Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits))
	(No client certificate requested)
	by ml01.01.org (Postfix) with ESMTPS id 1F9AC154CE712
	for <linux-nvdimm@lists.01.org>; Wed, 30 Sep 2020 09:19:57 -0700 (PDT)
Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;
	s=mimecast20190719; t=1601482796;
	h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
	 to:to:cc:cc:mime-version:mime-version:content-type:content-type:
	 content-transfer-encoding:content-transfer-encoding:
	 in-reply-to:in-reply-to:references:references:autocrypt:autocrypt;
	bh=uKHuH9gfvnBJHwuaFiorJLnujaRINjTiPs8W+xg/oe8=;
	b=iSobk10Q90GAUA9ap2/vybLLodNQW+24SDYJYLoh3dyhbQ38PpIHoEbZdValGe6QH9J9Bx
	RI4LNiZ+hVPKh9AGAccffU1lWPdm2w9tP5PdUniI6DYsEzKkGXgyCWLEU3s9gpXoqiAFDn
	jmzjl1aAubVlUm59V/4jY4nFYpQeDTQ=
Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com
 [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id
 us-mta-253-fC1XBErsOAOFrforCjbAhA-1; Wed, 30 Sep 2020 12:19:51 -0400
X-MC-Unique: fC1XBErsOAOFrforCjbAhA-1
Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11])
	(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
	(No client certificate requested)
	by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6495C807344;
	Wed, 30 Sep 2020 16:19:49 +0000 (UTC)
Received: from [10.36.112.204] (ovpn-112-204.ams2.redhat.com [10.36.112.204])
	by smtp.corp.redhat.com (Postfix) with ESMTP id 1CB4878833;
	Wed, 30 Sep 2020 16:19:45 +0000 (UTC)
Subject: Re: [PATCH v5 03/17] device-dax/kmem: move resource name tracking to
 drvdata
To: Dan Williams <dan.j.williams@intel.com>, akpm@linux-foundation.org
References: <160106109960.30709.7379926726669669398.stgit@dwillia2-desk3.amr.corp.intel.com>
 <160106111639.30709.17624822766862009183.stgit@dwillia2-desk3.amr.corp.intel.com>
From: David Hildenbrand <david@redhat.com>
Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata=
 mQINBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ
 dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL
 QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp
 XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK
 Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9
 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt
 WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc
 UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv
 jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb
 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABtCREYXZpZCBIaWxk
 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT6JAlgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW
 AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q
 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp
 rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf
 wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4
 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l
 pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd
 KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE
 BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs
 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF
 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9
 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63W5Ag0EVcufkQEQAOfX3n0g0fZz
 Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb
 T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A
 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk
 CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G
 NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75
 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx
 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS
 lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv
 AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa
 N7eop7uh+6bezi+rugUI+w6DABEBAAGJAjwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3
 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB
 boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq
 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f
 XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ
 a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq
 Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6
 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8
 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E
 th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr
 jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt
 WNyWQQ==
Organization: Red Hat GmbH
Message-ID: <316f7227-caf9-f207-1dd9-45bb4a6d0fde@redhat.com>
Date: Wed, 30 Sep 2020 18:19:45 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101
 Thunderbird/68.11.0
MIME-Version: 1.0
In-Reply-To: <160106111639.30709.17624822766862009183.stgit@dwillia2-desk3.amr.corp.intel.com>
Content-Language: en-US
X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11
Message-ID-Hash: OU7VLMKVB3DHE2R3HR4G6OC2NFLK4RRF
X-Message-ID-Hash: OU7VLMKVB3DHE2R3HR4G6OC2NFLK4RRF
X-MailFrom: david@redhat.com
X-Mailman-Rule-Hits: nonmember-moderation
X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation
CC: Dave Hansen <dave.hansen@linux.intel.com>, Pavel Tatashin <pasha.tatashin@soleen.com>, Brice Goglin <Brice.Goglin@inria.fr>, Jia He <justin.he@arm.com>, Joao Martins <joao.m.martins@oracle.com>, Jonathan Cameron <Jonathan.Cameron@huawei.com>, linux-mm@kvack.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org
X-Mailman-Version: 3.1.1
Precedence: list
List-Id: "Linux-nvdimm developer list." <linux-nvdimm.lists.01.org>
Archived-At: <https://lists.01.org/hyperkitty/list/linux-nvdimm@lists.01.org/message/OU7VLMKVB3DHE2R3HR4G6OC2NFLK4RRF/>
List-Archive: <https://lists.01.org/hyperkitty/list/linux-nvdimm@lists.01.org/>
List-Help: <mailto:linux-nvdimm-request@lists.01.org?subject=help>
List-Post: <mailto:linux-nvdimm@lists.01.org>
List-Subscribe: <mailto:linux-nvdimm-join@lists.01.org>
List-Unsubscribe: <mailto:linux-nvdimm-leave@lists.01.org>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit

On 25.09.20 21:11, Dan Williams wrote:
> Towards removing the mode specific @dax_kmem_res attribute from the
> generic 'struct dev_dax', and preparing for multi-range support, move
> resource name tracking to driver data.  The memory for the resource name
> needs to have its own lifetime separate from the device bind lifetime
> for cases where the driver is unbound, but the kmem range could not be
> unplugged from the page allocator.
> 
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Vishal Verma <vishal.l.verma@intel.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
> Cc: Brice Goglin <Brice.Goglin@inria.fr>
> Cc: Dave Jiang <dave.jiang@intel.com>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Ira Weiny <ira.weiny@intel.com>
> Cc: Jia He <justin.he@arm.com>
> Cc: Joao Martins <joao.m.martins@oracle.com>
> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
>  drivers/dax/kmem.c |   16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
> index b0d6a99cf12d..6fe2cb1c5f7c 100644
> --- a/drivers/dax/kmem.c
> +++ b/drivers/dax/kmem.c
> @@ -34,7 +34,7 @@ int dev_dax_kmem_probe(struct device *dev)
>  	struct dev_dax *dev_dax = to_dev_dax(dev);
>  	struct range range = dax_kmem_range(dev_dax);
>  	struct resource *new_res;
> -	const char *new_res_name;
> +	char *res_name;

I wonder why that change ...

>  	int numa_node;
>  	int rc;
>  
> @@ -51,15 +51,15 @@ int dev_dax_kmem_probe(struct device *dev)
>  		return -EINVAL;
>  	}
>  
> -	new_res_name = kstrdup(dev_name(dev), GFP_KERNEL);
> -	if (!new_res_name)
> +	res_name = kstrdup(dev_name(dev), GFP_KERNEL);
> +	if (!res_name)
>  		return -ENOMEM;
>  
>  	/* Region is permanently reserved if hotremove fails. */
> -	new_res = request_mem_region(range.start, range_len(&range), new_res_name);
> +	new_res = request_mem_region(range.start, range_len(&range), res_name);
>  	if (!new_res) {
>  		dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end);
> -		kfree(new_res_name);
> +		kfree(res_name);
>  		return -EBUSY;
>  	}
>  
> @@ -80,9 +80,11 @@ int dev_dax_kmem_probe(struct device *dev)
>  	if (rc) {
>  		release_resource(new_res);
>  		kfree(new_res);
> -		kfree(new_res_name);
> +		kfree(res_name);
>  		return rc;
>  	}
> +
> +	dev_set_drvdata(dev, res_name);
>  	dev_dax->dax_kmem_res = new_res;
>  
>  	return 0;
> @@ -94,7 +96,7 @@ static int dev_dax_kmem_remove(struct device *dev)
>  	struct dev_dax *dev_dax = to_dev_dax(dev);
>  	struct range range = dax_kmem_range(dev_dax);
>  	struct resource *res = dev_dax->dax_kmem_res;
> -	const char *res_name = res->name;
> +	const char *res_name = dev_get_drvdata(dev);

... because here you're back to "const".

>  	int rc;
>  
>  	/*
> 

I do wonder if it wouldn't all be easier to just have some

struct {
	const char *res_name;
	struct resource *res;
};

allocating that and storing it as drvdata. But let's see what the next
patch brings :)

-- 
Thanks,

David / dhildenb
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org