From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f70.google.com (mail-pl0-f70.google.com [209.85.160.70]) by kanga.kvack.org (Postfix) with ESMTP id 5DA376B02D1 for ; Wed, 7 Feb 2018 02:13:36 -0500 (EST) Received: by mail-pl0-f70.google.com with SMTP id f4so3131150plr.14 for ; Tue, 06 Feb 2018 23:13:36 -0800 (PST) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTPS id n9si570805pgr.552.2018.02.06.23.13.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 06 Feb 2018 23:13:35 -0800 (PST) From: Wei Wang Subject: [PATCH v27 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules Date: Wed, 7 Feb 2018 14:54:30 +0800 Message-Id: <1517986471-15185-4-git-send-email-wei.w.wang@intel.com> In-Reply-To: <1517986471-15185-1-git-send-email-wei.w.wang@intel.com> References: <1517986471-15185-1-git-send-email-wei.w.wang@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: virtio-dev@lists.oasis-open.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-mm@kvack.org, mst@redhat.com, mhocko@kernel.org, akpm@linux-foundation.org Cc: pbonzini@redhat.com, wei.w.wang@intel.com, liliang.opensource@gmail.com, yang.zhang.wz@gmail.com, quan.xu0@gmail.com, nilal@redhat.com, riel@redhat.com, huangzhichao@huawei.com In some usages, e.g. virtio-balloon, a kernel module needs to know if page poisoning is in use. This patch exposes the page_poisoning_enabled function to kernel modules. Signed-off-by: Wei Wang Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin --- mm/page_poison.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/page_poison.c b/mm/page_poison.c index e83fd44..c08d02a 100644 --- a/mm/page_poison.c +++ b/mm/page_poison.c @@ -30,6 +30,11 @@ bool page_poisoning_enabled(void) debug_pagealloc_enabled())); } +/** + * page_poisoning_enabled - check if page poisoning is enabled + * + * Return true if page poisoning is enabled, or false if not. + */ static void poison_page(struct page *page) { void *addr = kmap_atomic(page); @@ -37,6 +42,7 @@ static void poison_page(struct page *page) memset(addr, PAGE_POISON, PAGE_SIZE); kunmap_atomic(addr); } +EXPORT_SYMBOL_GPL(page_poisoning_enabled); static void poison_pages(struct page *page, int n) { -- 2.7.4 -- 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