From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f72.google.com (mail-pg0-f72.google.com [74.125.83.72]) by kanga.kvack.org (Postfix) with ESMTP id 28E7A6B000E for ; Mon, 25 Jun 2018 08:30:43 -0400 (EDT) Received: by mail-pg0-f72.google.com with SMTP id e1-v6so4938253pgp.20 for ; Mon, 25 Jun 2018 05:30:43 -0700 (PDT) Received: from mga17.intel.com (mga17.intel.com. [192.55.52.151]) by mx.google.com with ESMTPS id a8-v6si11509942pgu.544.2018.06.25.05.30.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 25 Jun 2018 05:30:41 -0700 (PDT) From: Wei Wang Subject: [PATCH v34 3/4] mm/page_poison: expose page_poisoning_enabled to kernel modules Date: Mon, 25 Jun 2018 20:05:11 +0800 Message-Id: <1529928312-30500-4-git-send-email-wei.w.wang@intel.com> In-Reply-To: <1529928312-30500-1-git-send-email-wei.w.wang@intel.com> References: <1529928312-30500-1-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: torvalds@linux-foundation.org, 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, peterx@redhat.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 Acked-by: Andrew Morton --- mm/page_poison.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/page_poison.c b/mm/page_poison.c index aa2b3d3..830f604 100644 --- a/mm/page_poison.c +++ b/mm/page_poison.c @@ -17,6 +17,11 @@ static int __init early_page_poison_param(char *buf) } early_param("page_poison", early_page_poison_param); +/** + * page_poisoning_enabled - check if page poisoning is enabled + * + * Return true if page poisoning is enabled, or false if not. + */ bool page_poisoning_enabled(void) { /* @@ -29,6 +34,7 @@ bool page_poisoning_enabled(void) (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && debug_pagealloc_enabled())); } +EXPORT_SYMBOL_GPL(page_poisoning_enabled); static void poison_page(struct page *page) { -- 2.7.4