From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15FF7C282DB for ; Mon, 21 Jan 2019 07:41:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E23A9214C6 for ; Mon, 21 Jan 2019 07:41:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728807AbfAUHln (ORCPT ); Mon, 21 Jan 2019 02:41:43 -0500 Received: from mga14.intel.com ([192.55.52.115]:22809 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728513AbfAUHlm (ORCPT ); Mon, 21 Jan 2019 02:41:42 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Jan 2019 17:20:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,501,1539673200"; d="scan'208";a="127304364" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.37]) by FMSMGA003.fm.intel.com with ESMTP; 20 Jan 2019 17:20:53 -0800 From: Wei Yang To: linux-kernel@vger.kernel.org Cc: jack@suse.cz, dan.j.williams@intel.com, Wei Yang Subject: [PATCH] kernel, resource: use resource_overlaps() to simplify region_intersects() Date: Mon, 21 Jan 2019 09:20:28 +0800 Message-Id: <20190121012028.3913-1-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The three checks in region_intersects() is to see whether two resources overlap. This means it could be simplified with one resource_overlaps(). Also fix two typo in related function. Signed-off-by: Wei Yang --- kernel/iomem.c | 4 ++-- kernel/resource.c | 11 +++++------ 2 files changed, 7 insertions(+), 8 deletions(-) diff --git a/kernel/iomem.c b/kernel/iomem.c index f7525e14ebc6..93c264444510 100644 --- a/kernel/iomem.c +++ b/kernel/iomem.c @@ -55,7 +55,7 @@ static void *try_ram_remap(resource_size_t offset, size_t size, * * MEMREMAP_WB - matches the default mapping for System RAM on * the architecture. This is usually a read-allocate write-back cache. - * Morever, if MEMREMAP_WB is specified and the requested remap region is RAM + * Moreover, if MEMREMAP_WB is specified and the requested remap region is RAM * memremap() will bypass establishing a new mapping and instead return * a pointer into the direct map. * @@ -86,7 +86,7 @@ void *memremap(resource_size_t offset, size_t size, unsigned long flags) /* Try all mapping types requested until one returns non-NULL */ if (flags & MEMREMAP_WB) { /* - * MEMREMAP_WB is special in that it can be satisifed + * MEMREMAP_WB is special in that it can be satisfied * from the direct map. Some archs depend on the * capability of memremap() to autodetect cases where * the requested range is potentially in System RAM. diff --git a/kernel/resource.c b/kernel/resource.c index b0fbf685c77a..34dfb94305bb 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -521,21 +521,20 @@ EXPORT_SYMBOL_GPL(page_is_ram); int region_intersects(resource_size_t start, size_t size, unsigned long flags, unsigned long desc) { - resource_size_t end = start + size - 1; + struct resource res; int type = 0; int other = 0; struct resource *p; + res.start = start; + res.end = start + size - 1; + read_lock(&resource_lock); for (p = iomem_resource.child; p ; p = p->sibling) { bool is_type = (((p->flags & flags) == flags) && ((desc == IORES_DESC_NONE) || (desc == p->desc))); - if (start >= p->start && start <= p->end) - is_type ? type++ : other++; - if (end >= p->start && end <= p->end) - is_type ? type++ : other++; - if (p->start >= start && p->end <= end) + if (resource_overlaps(p, &res)) is_type ? type++ : other++; } read_unlock(&resource_lock); -- 2.19.1