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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 454EDC43217 for ; Fri, 21 Oct 2022 10:13:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230380AbiJUKM7 (ORCPT ); Fri, 21 Oct 2022 06:12:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230339AbiJUKMm (ORCPT ); Fri, 21 Oct 2022 06:12:42 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 191637AB08 for ; Fri, 21 Oct 2022 03:12:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666347159; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3jjsbfVX32kRXRzGJzqZMgspzFJroQ0YMSc5QEJ3H8s=; b=gcO/3AFsz3ar9p76VY8o1UnQXQvkCtMBXQ7xzXeP15/xultDfC4XSFDM4nLtf1RMQblHyL 2o0cLOtiOaOoeUMG22b0C3Q++xpq+VyJrCk+j3Mn1jf+GoiHkRtBrawmanDYnngpCjHn9q 16KMOHFr+gZsmlZ3adl2umOitQWPnq8= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-621-079V-auANpW0rqJrmq2chA-1; Fri, 21 Oct 2022 06:12:36 -0400 X-MC-Unique: 079V-auANpW0rqJrmq2chA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 97B9B3C0F23B; Fri, 21 Oct 2022 10:12:35 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.99]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6A76A40E80E9; Fri, 21 Oct 2022 10:12:33 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, David Hildenbrand , Andrew Morton , Shuah Khan , Hugh Dickins , Vlastimil Babka , Peter Xu , Andrea Arcangeli , "Matthew Wilcox (Oracle)" , Jason Gunthorpe , John Hubbard Subject: [PATCH v2 7/9] mm/pagewalk: add walk_page_range_vma() Date: Fri, 21 Oct 2022 12:11:39 +0200 Message-Id: <20221021101141.84170-8-david@redhat.com> In-Reply-To: <20221021101141.84170-1-david@redhat.com> References: <20221021101141.84170-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Let's add walk_page_range_vma(), which is similar to walk_page_vma(), however, is only interested in a subset of the VMA range. To be used in KSM code to stop using follow_page() next. Signed-off-by: David Hildenbrand --- include/linux/pagewalk.h | 3 +++ mm/pagewalk.c | 20 ++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/pagewalk.h b/include/linux/pagewalk.h index 37dc0208862d..959f52e5867d 100644 --- a/include/linux/pagewalk.h +++ b/include/linux/pagewalk.h @@ -101,6 +101,9 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, unsigned long end, const struct mm_walk_ops *ops, pgd_t *pgd, void *private); +int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end, const struct mm_walk_ops *ops, + void *private); int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, void *private); int walk_page_mapping(struct address_space *mapping, pgoff_t first_index, diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 0a5d71aaf9c7..7f1c9b274906 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -517,6 +517,26 @@ int walk_page_range_novma(struct mm_struct *mm, unsigned long start, return walk_pgd_range(start, end, &walk); } +int walk_page_range_vma(struct vm_area_struct *vma, unsigned long start, + unsigned long end, const struct mm_walk_ops *ops, + void *private) +{ + struct mm_walk walk = { + .ops = ops, + .mm = vma->vm_mm, + .vma = vma, + .private = private, + }; + + if (start >= end || !walk.mm) + return -EINVAL; + if (start < vma->vm_start || end > vma->vm_end) + return -EINVAL; + + mmap_assert_locked(walk.mm); + return __walk_page_range(start, end, &walk); +} + int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops, void *private) { -- 2.37.3