From patchwork Fri Oct 21 06:24:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang Li X-Patchwork-Id: 9388099 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 9E03460231 for ; Fri, 21 Oct 2016 06:38:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8F23829DE7 for ; Fri, 21 Oct 2016 06:38:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 83A6829E1D; Fri, 21 Oct 2016 06:38:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 49FB829DF7 for ; Fri, 21 Oct 2016 06:38:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754460AbcJUGi2 (ORCPT ); Fri, 21 Oct 2016 02:38:28 -0400 Received: from mga03.intel.com ([134.134.136.65]:23422 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754616AbcJUGhM (ORCPT ); Fri, 21 Oct 2016 02:37:12 -0400 Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga103.jf.intel.com with ESMTP; 20 Oct 2016 23:37:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,375,1473145200"; d="scan'208";a="22396692" Received: from ll.sh.intel.com (HELO localhost) ([10.239.13.123]) by orsmga004.jf.intel.com with ESMTP; 20 Oct 2016 23:37:06 -0700 From: Liang Li To: mst@redhat.com Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, quintela@redhat.com, dgilbert@redhat.com, dave.hansen@intel.com, pbonzini@redhat.com, cornelia.huck@de.ibm.com, amit.shah@redhat.com, Liang Li , Andrew Morton , Mel Gorman Subject: [RESEND PATCH v3 kernel 3/7] mm: add a function to get the max pfn Date: Fri, 21 Oct 2016 14:24:36 +0800 Message-Id: <1477031080-12616-4-git-send-email-liang.z.li@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1477031080-12616-1-git-send-email-liang.z.li@intel.com> References: <1477031080-12616-1-git-send-email-liang.z.li@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Expose the function to get the max pfn, so it can be used in the virtio-balloon device driver. Simply include the 'linux/bootmem.h' is not enough, if the device driver is built to a module, directly refer the max_pfn lead to build failed. Signed-off-by: Liang Li Cc: Andrew Morton Cc: Mel Gorman Cc: Michael S. Tsirkin Cc: Paolo Bonzini Cc: Cornelia Huck Cc: Amit Shah --- include/linux/mm.h | 1 + mm/page_alloc.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index ffbd729..2a89da0e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1776,6 +1776,7 @@ static inline spinlock_t *pmd_lock(struct mm_struct *mm, pmd_t *pmd) extern void free_area_init_node(int nid, unsigned long * zones_size, unsigned long zone_start_pfn, unsigned long *zholes_size); extern void free_initmem(void); +extern unsigned long get_max_pfn(void); /* * Free reserved pages within range [PAGE_ALIGN(start), end & PAGE_MASK) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2b3bf67..e5f63a9 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4426,6 +4426,16 @@ void show_free_areas(unsigned int filter) show_swap_cache_info(); } +/* + * The max_pfn can change because of memory hot plug, so it's only good + * as a hint. e.g. for sizing data structures. + */ +unsigned long get_max_pfn(void) +{ + return max_pfn; +} +EXPORT_SYMBOL(get_max_pfn); + static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) { zoneref->zone = zone;