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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 D4A85C4727D for ; Thu, 24 Sep 2020 13:59:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6ACBD23741 for ; Thu, 24 Sep 2020 13:59:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="NUh5M0Va" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6ACBD23741 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0972A90003C; Thu, 24 Sep 2020 09:59:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0491090002C; Thu, 24 Sep 2020 09:59:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EA2F590003C; Thu, 24 Sep 2020 09:59:20 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0007.hostedemail.com [216.40.44.7]) by kanga.kvack.org (Postfix) with ESMTP id CFDDD90002C for ; Thu, 24 Sep 2020 09:59:20 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 8A97F8249980 for ; Thu, 24 Sep 2020 13:59:20 +0000 (UTC) X-FDA: 77298112080.03.cough50_030fb702715f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin03.hostedemail.com (Postfix) with ESMTP id 6247328A4E8 for ; Thu, 24 Sep 2020 13:59:20 +0000 (UTC) X-HE-Tag: cough50_030fb702715f X-Filterd-Recvd-Size: 4335 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf50.hostedemail.com (Postfix) with ESMTP for ; Thu, 24 Sep 2020 13:59:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=71LvYnHcMs7/rXGs508r2vzZrQvLA4mfS9GwJnz8e8I=; b=NUh5M0VarQIgBQqYaNlO1oJ5uD w8nVLotPmpd4oOZHHmvT2oHT7kVaN0TcgUMi5DUHiHdGTOvq+g3NO/KutuwysCvRae9RwPYp4rIvr iYNqfACDnH46rTLtHfvdsfC5VKzkUhO4F7ry/18RDOE0cR9gOYIJqR61QLO0qCQoj84BLYu10d+QK jc5SfjEAV8jLUC7hFJUbKC2hBzexIDKoQBbp6+XtPVn9ewLvlb4tB3C3LgoKZwg19+/aKKBtYx35D VOCzQ531qSBqmHg9FlZAu3/x99eoa2dKESyDZSZVYteLbCXHwidWSrgcqQ9no1BgOWJ5GpHmtXMo1 1w5Yhf8A==; Received: from p4fdb0c34.dip0.t-ipconnect.de ([79.219.12.52] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kLRlw-0003uz-IY; Thu, 24 Sep 2020 13:58:56 +0000 From: Christoph Hellwig To: Andrew Morton Cc: Peter Zijlstra , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , Chris Wilson , Matthew Auld , Rodrigo Vivi , Minchan Kim , Matthew Wilcox , Nitin Gupta , x86@kernel.org, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org Subject: [PATCH 02/11] mm: add a VM_MAP_PUT_PAGES flag for vmap Date: Thu, 24 Sep 2020 15:58:44 +0200 Message-Id: <20200924135853.875294-3-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200924135853.875294-1-hch@lst.de> References: <20200924135853.875294-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add a flag so that vmap takes ownership of the passed in page array. When vfree is called on such an allocation it will put one reference on each page, and free the page array itself. Signed-off-by: Christoph Hellwig --- include/linux/vmalloc.h | 1 + mm/vmalloc.c | 9 +++++++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 0221f852a7e1a3..b899681e3ff9f0 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -24,6 +24,7 @@ struct notifier_block; /* in notifier.h */ #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialize= d */ #define VM_NO_GUARD 0x00000040 /* don't add guard page */ #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory *= / +#define VM_MAP_PUT_PAGES 0x00000100 /* put pages and free array in vfree= */ =20 /* * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLO= C. diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 8770260419af06..ffad65f052c3f9 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -2377,8 +2377,11 @@ EXPORT_SYMBOL(vunmap); * @flags: vm_area->flags * @prot: page protection for the mapping * - * Maps @count pages from @pages into contiguous kernel virtual - * space. + * Maps @count pages from @pages into contiguous kernel virtual space. + * If @flags contains %VM_MAP_PUT_PAGES the ownership of the pages array= itself + * (which must be kmalloc or vmalloc memory) and one reference per pages= in it + * are transferred from the caller to vmap(), and will be freed / droppe= d when + * vfree() is called on the return value. * * Return: the address of the area or %NULL on failure */ @@ -2404,6 +2407,8 @@ void *vmap(struct page **pages, unsigned int count, return NULL; } =20 + if (flags & VM_MAP_PUT_PAGES) + area->pages =3D pages; return area->addr; } EXPORT_SYMBOL(vmap); --=20 2.28.0