Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753779AbcDFVVx (ORCPT ); Wed, 6 Apr 2016 17:21:53 -0400 Received: from mga11.intel.com ([192.55.52.93]:57416 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750971AbcDFVVv (ORCPT ); Wed, 6 Apr 2016 17:21:51 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,448,1455004800"; d="scan'208";a="926986183" From: Matthew Wilcox To: linux-kernel@vger.kernel.org, Andrew Morton Cc: Matthew Wilcox , Ross Zwisler , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Konstantin Khlebnikov , Kirill Shutemov , Jan Kara , Neil Brown Subject: [PATCH 01/30] radix-tree: Introduce radix_tree_empty Date: Wed, 6 Apr 2016 17:21:10 -0400 Message-Id: <1459977699-2349-2-git-send-email-willy@linux.intel.com> X-Mailer: git-send-email 2.8.0.rc3 In-Reply-To: <1459977699-2349-1-git-send-email-willy@linux.intel.com> References: <1459977699-2349-1-git-send-email-willy@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1371 Lines: 47 The irqdomain code was checking for 0 or 1 entries, not 0 entries like the comment said they were. Introduce a new helper that will actually check for an empty tree. Signed-off-by: Matthew Wilcox Reviewed-by: Ross Zwisler --- include/linux/radix-tree.h | 5 +++++ kernel/irq/irqdomain.c | 7 +------ 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h index 51a97ac8bfbf..83f708e5db59 100644 --- a/include/linux/radix-tree.h +++ b/include/linux/radix-tree.h @@ -136,6 +136,11 @@ do { \ (root)->rnode = NULL; \ } while (0) +static inline bool radix_tree_empty(struct radix_tree_root *root) +{ + return root->rnode == NULL; +} + /** * Radix-tree synchronization * diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 3a519a01118b..ba3f60d8df2f 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -139,12 +139,7 @@ void irq_domain_remove(struct irq_domain *domain) { mutex_lock(&irq_domain_mutex); - /* - * radix_tree_delete() takes care of destroying the root - * node when all entries are removed. Shout if there are - * any mappings left. - */ - WARN_ON(domain->revmap_tree.height); + WARN_ON(!radix_tree_empty(&domain->revmap_tree)); list_del(&domain->link); -- 2.8.0.rc3