From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 59CB4280250 for ; Fri, 21 Oct 2016 02:37:12 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id n85so45143739pfi.7 for ; Thu, 20 Oct 2016 23:37:12 -0700 (PDT) Received: from mga09.intel.com (mga09.intel.com. [134.134.136.24]) by mx.google.com with ESMTPS id g16si1244377pfj.150.2016.10.20.23.37.11 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 20 Oct 2016 23:37:11 -0700 (PDT) From: Liang Li 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> 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: owner-linux-mm@kvack.org List-ID: 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 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; -- 1.8.3.1 -- 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