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=-6.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 4EDAFC43457 for ; Sat, 17 Oct 2020 23:14:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 181D020897 for ; Sat, 17 Oct 2020 23:14:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602976448; bh=0XHlP719nJRI+EVhTk6Cs4CWAHZk5C5nuGJnmRbAUzc=; h=Date:From:To:Subject:In-Reply-To:Reply-To:List-ID:From; b=DpfMpnMCRPU7RE9IWRIV31dHqpniRKhFM6st9gk/lgGNlndqkx3x3x7qpOwNv/jHn yzKiYFPdv1VhxXeBuo4Yk7OjRDH9c4ov6Gh5Sw6m3UV7jmx4+SMuLrk/JxSnAk+z1K HazILJe/DXM8f1CYKkdqF3lqQsKMjtNIktboy8Vw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2439889AbgJQXOH (ORCPT ); Sat, 17 Oct 2020 19:14:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:47822 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2439878AbgJQXOH (ORCPT ); Sat, 17 Oct 2020 19:14:07 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BE74E208E4; Sat, 17 Oct 2020 23:14:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602976447; bh=0XHlP719nJRI+EVhTk6Cs4CWAHZk5C5nuGJnmRbAUzc=; h=Date:From:To:Subject:In-Reply-To:From; b=qxWpwbQ7s3Rx+Oj/Muw0KEc6BkAGTcTYZ9KHfbYn2OXtPiat+HMTdtNtqYd2xrchi m9vv+e3TspkL4JyynwycGUPXd0oNiTclqj6qGPXGKO+YTySUbyebM4QLW8jPArIU4L yljpKWaCnjpW+DLQYAS2n/jSjEoIr1+ZJsVNCIeQ= Date: Sat, 17 Oct 2020 16:14:06 -0700 From: Andrew Morton To: akpm@linux-foundation.org, Liam.Howlett@Oracle.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 10/40] mm/mmap: add inline vma_next() for readability of mmap code Message-ID: <20201017231406.Fm-sT8ouL%akpm@linux-foundation.org> In-Reply-To: <20201017161314.88890b87fae7446ccc13c902@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: "Liam R. Howlett" Subject: mm/mmap: add inline vma_next() for readability of mmap code There are three places that the next vma is required which uses the same block of code. Replace the block with a function and add comments on what happens in the case where NULL is encountered. Link: http://lkml.kernel.org/r/20200818154707.2515169-1-Liam.Howlett@Oracle.com Signed-off-by: Liam R. Howlett Reviewed-by: Andrew Morton Signed-off-by: Andrew Morton --- mm/mmap.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) --- a/mm/mmap.c~mm-mmap-add-inline-vma_next-for-readability-of-mmap-code +++ a/mm/mmap.c @@ -558,6 +558,23 @@ static int find_vma_links(struct mm_stru return 0; } +/* + * vma_next() - Get the next VMA. + * @mm: The mm_struct. + * @vma: The current vma. + * + * If @vma is NULL, return the first vma in the mm. + * + * Returns: The next VMA after @vma. + */ +static inline struct vm_area_struct *vma_next(struct mm_struct *mm, + struct vm_area_struct *vma) +{ + if (!vma) + return mm->mmap; + + return vma->vm_next; +} static unsigned long count_vma_pages_range(struct mm_struct *mm, unsigned long addr, unsigned long end) { @@ -1128,10 +1145,7 @@ struct vm_area_struct *vma_merge(struct if (vm_flags & VM_SPECIAL) return NULL; - if (prev) - next = prev->vm_next; - else - next = mm->mmap; + next = vma_next(mm, prev); area = next; if (area && area->vm_end == end) /* cases 6, 7, 8 */ next = next->vm_next; @@ -2632,7 +2646,7 @@ static void unmap_region(struct mm_struc struct vm_area_struct *vma, struct vm_area_struct *prev, unsigned long start, unsigned long end) { - struct vm_area_struct *next = prev ? prev->vm_next : mm->mmap; + struct vm_area_struct *next = vma_next(mm, prev); struct mmu_gather tlb; lru_add_drain(); @@ -2831,7 +2845,7 @@ int __do_munmap(struct mm_struct *mm, un if (error) return error; } - vma = prev ? prev->vm_next : mm->mmap; + vma = vma_next(mm, prev); if (unlikely(uf)) { /* _