From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3649678-1527052818-2-5713206701683047473 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no ("Email failed DMARC policy for domain") X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.248, MAILING_LIST_MULTI -1, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='com', MailFrom='org' X-Spam-charsets: cc='utf-8', plain='utf-8' X-IgnoreVacation: yes ("Email failed DMARC policy for domain") X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=fm2; t= 1527052817; b=kODJBo+7mHln/Uq5q/NN0sanqonrYcJKm1s9LbgdMn9QYSoUiX x2msWomn4IqjJRLKiCxMATKDPZR6pLw0IJYcWu+2RS3eSn/NIt7DpQV8JkA91QRl Jgws2InR/OYuyCTDv5u6KPRGXv8fAjCEEkw17VvCFkGyNsxLm4yia4IXyDo8kw9Y heCM38mI3VsXpWCTNLD+LSYhH+WEleBTGuyX2b+Xt3RMop5zyNJ+VzEi1wCQ8sWM DYimk0NaBujEi2N+m1PM8l9vIZVp+TIOaBnkjHe2lMo5Pr1UXBse4io/QrVqPwzB g8wtxGGr8EmQpvTuZZm7t+D6D96FPoJdPrsg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=subject:from:to:cc:date:message-id :mime-version:content-type:content-transfer-encoding:sender :list-id; s=fm2; t=1527052817; bh=lbR4RWuaMKWJyuKGi2OikpoyofrT4k 60M1yvkRS5qUw=; b=QEahj5Tm0YV8mvujY8rckwTzDPOo7ViS2yMz2kFF7fXteI SI8F/gFu0QKCGdrpaXSud2McSNxkbF83yjJc/gYZZYenv48WaGuNZ+igaj54Riui uw2dpQeTwreZvvWZ6+A9QIt5aLoT1uLMPpIm++2s58raKfoeCfl1k992sfmtJaYk JTMuY/r04OmF5olV+40G+EPreAJv9L2cZPvPQZSnLpxSVLXOIF+bvj09kRMmFRto CBxBA5UM0/hAbawdDU5GqmyWtJGz0sWDfYxRARFgG3ZN0CFxf1HpkJjbKOwZMfTW NcsKPOtuIcUdW63yfXGCeP0eedMvM42vKksrm8eQ== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=intel.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=intel.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=fail (p=none,has-list-id=yes,d=none) header.from=intel.com; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-cm=none score=0; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=intel.com header.result=pass header_is_org_domain=yes; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfEmfJ1se/fnM6ICnM6UiiFwd6vLCu5d6VdovmnxoDYhxdzbQiL0HqTS8KsyKprxP19cj9cOh4TaMNVXgpPH4mZrLJHCFoafkelNSywkba0l6StpnQ57Q lCyV1Stj0LyTQ/L13CYAEGM9RSlWpXDLEuk1aIV1d2Sg+nfLgWwRZhODEN7WAZaPLlzXPex3tBxSQtoutPyF69mYnnShLANOduKdu/GbC38KeK8YHhGTNLmg X-CM-Analysis: v=2.3 cv=NPP7BXyg c=1 sm=1 tr=0 a=UK1r566ZdBxH71SXbqIOeA==:117 a=UK1r566ZdBxH71SXbqIOeA==:17 a=IkcTkHD0fZMA:10 a=VUJBJC2UJ8kA:10 a=D19gQVrFAAAA:8 a=MgTO5YS3Dgot8pfIxtcA:9 a=QEXdDO2ut3YA:10 a=W4TVW4IDbPiebHqcZpNg:22 X-ME-CMScore: 0 X-ME-CMCategory: none Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751399AbeEWFUQ (ORCPT ); Wed, 23 May 2018 01:20:16 -0400 Received: from mga09.intel.com ([134.134.136.24]:5068 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751300AbeEWFUP (ORCPT ); Wed, 23 May 2018 01:20:15 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,431,1520924400"; d="scan'208";a="51454456" Subject: [PATCH v2 0/7] mm: Rework hmm to use devm_memremap_pages From: Dan Williams To: akpm@linux-foundation.org Cc: stable@vger.kernel.org, Logan Gunthorpe , Christoph Hellwig , =?utf-8?b?SsOpcsO0bWU=?= Glisse , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Tue, 22 May 2018 22:10:17 -0700 Message-ID: <152705221686.21414.771870778478134768.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-2-gc94f MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Changes since v1: [1] * Kill support for mapping System RAM as a nop. No one uses this functionality and it is broken relative to percpu_ref management. * Fix percpu_ref teardown. Given that devm_memremap_pages() has strict assumptions about when the percpu_ref is killed, give it responsibility to make the live-dead transition explicitly. (Logan) * Split the patch that adds HMM support to devm_memremap_pages() from the patch that converts HMM to use devm_memremap_pages(). This caught an incomplete conversion in v1. (Logan) * Collect Christoph's reviewed-by. [1]: https://lkml.org/lkml/2018/5/21/1109 --- Hi Andrew, here's v2 to replace the 5 currently in mm. The first and last patch did not change. For maintainability, as ZONE_DEVICE continues to attract new users, it is useful to keep all users consolidated on devm_memremap_pages() as the interface for create "device pages". The devm_memremap_pages() implementation was recently reworked to make it more generic for arbitrary users, like the proposed peer-to-peer PCI-E enabling. HMM pre-dated this rework and opted to duplicate devm_memremap_pages() as hmm_devmem_pages_create(). Rework HMM to be a consumer of devm_memremap_pages() directly and fix up the licensing on the exports given the deep dependencies on the mm. Patches based on v4.17-rc6 where there are no upstream consumers of the HMM functionality. --- Dan Williams (7): mm, devm_memremap_pages: Mark devm_memremap_pages() EXPORT_SYMBOL_GPL mm, devm_memremap_pages: Kill mapping "System RAM" support mm, devm_memremap_pages: Fix shutdown handling mm, devm_memremap_pages: Add MEMORY_DEVICE_PRIVATE support mm, hmm: Use devm semantics for hmm_devmem_{add,remove} mm, hmm: Replace hmm_devmem_pages_create() with devm_memremap_pages() mm, hmm: Mark hmm_devmem_{add,add_resource} EXPORT_SYMBOL_GPL Documentation/vm/hmm.txt | 1 drivers/dax/pmem.c | 10 - drivers/nvdimm/pmem.c | 18 +- include/linux/hmm.h | 4 include/linux/memremap.h | 7 + kernel/memremap.c | 85 +++++++--- mm/hmm.c | 307 +++++-------------------------------- tools/testing/nvdimm/test/iomap.c | 21 ++- 8 files changed, 130 insertions(+), 323 deletions(-)