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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 9D6C3C2BB1D for ; Wed, 11 Mar 2020 18:35:30 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 425E1206E9 for ; Wed, 11 Mar 2020 18:35:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="nU/438MJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 425E1206E9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 149FA6B000A; Wed, 11 Mar 2020 14:35:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 125A56B000D; Wed, 11 Mar 2020 14:35:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F2D2E6B000E; Wed, 11 Mar 2020 14:35:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0250.hostedemail.com [216.40.44.250]) by kanga.kvack.org (Postfix) with ESMTP id B98406B000A for ; Wed, 11 Mar 2020 14:35:19 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 7D3DC181AEF09 for ; Wed, 11 Mar 2020 18:35:19 +0000 (UTC) X-FDA: 76583933958.20.shoes97_68a3c0eb2fc10 X-HE-Tag: shoes97_68a3c0eb2fc10 X-Filterd-Recvd-Size: 5186 Received: from mail-qt1-f195.google.com (mail-qt1-f195.google.com [209.85.160.195]) by imf16.hostedemail.com (Postfix) with ESMTP for ; Wed, 11 Mar 2020 18:35:18 +0000 (UTC) Received: by mail-qt1-f195.google.com with SMTP id a4so2324585qto.12 for ; Wed, 11 Mar 2020 11:35:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=7tlzdKvmVhZXurBBb+bDdPz4NTtXbLSAXRRPdzQxqMg=; b=nU/438MJuKpkChqrzGp1uQGe8kdR+9FMZNnY3eJEh1/fEkuAylxu/p3vRpF+STOTTc 1aZg6sghnmz+a1b1hofgPaLUEiSjYs6mnou5cSAQpAbusouHhmCshZJn5Y+BpFibMFws sS75VycDsMUXbQ5eG56z8VC2S20c63fEttL1RiDnUqJDg+27ki6Luzb2lDKvYEm/m63H 6AZ3S+ZudbR9EAgzdlmCv8l453QIr6/K4xP1Yxid64YED9TXkLOxfIreGtEKC+JHYDou mhQgU7/y1uYgxw3hMkdkxrzX6Tt8Qzhinu+oRAIaElTPL8qH6WmoiY+PgLkYkfRfEjMh 7g9A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=7tlzdKvmVhZXurBBb+bDdPz4NTtXbLSAXRRPdzQxqMg=; b=NyHW0ZiY8G/t5SpUTCqdZx/P3i4pLMWZ9DQI/5csowOlWvg50AZtQVBwx1iJYT4WbJ 5ppRPgDu3W4G6F5gChourpEnfYr9FPItmYPm9X/3U9Pd015ZWJempnTe7EoprpBEfhZ8 BExCHlOQTgGM6PiwpHtJwD4rqhlNRldpWMJC90Xrg2FjUN25uzRGYgaUXOR/oYl1JBMa CSzM6AaBgQDgaqZDhYJAX5VhZOCUObKntNIH11UNWXfouYCnxwGJOrB8GioHTN7FSK9N 9QccsqMSzcH5UubEclRwO0Dc1c5Ox/sXKPClzH74aLsQRAMVtwH7e1RU6NcZxVOUI0HK Iu/g== X-Gm-Message-State: ANhLgQ18DxaCu0IVJusbOrlzgxf0WpZawhTdFMinG1+I5qOAyX4qqxzH tA5gI76Td4aP89ChCT5oZ+qMhA== X-Google-Smtp-Source: ADFU+vvx8+qty+5T7X6/CVYANONypWbzRUqA+9Oqg9yC8JsorlJ4ocR7hpiWYgd7bDnMLWyAZmGiVQ== X-Received: by 2002:ac8:6f4c:: with SMTP id n12mr4002527qtv.367.1583951717799; Wed, 11 Mar 2020 11:35:17 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-142-68-57-212.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.68.57.212]) by smtp.gmail.com with ESMTPSA id 3sm26733708qte.59.2020.03.11.11.35.15 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 11 Mar 2020 11:35:16 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1jC6CJ-00016L-4h; Wed, 11 Mar 2020 15:35:15 -0300 From: Jason Gunthorpe To: Jerome Glisse , Ralph Campbell , Felix.Kuehling@amd.com Cc: linux-mm@kvack.org, John Hubbard , dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Philip Yang , Jason Gunthorpe , Steven Price Subject: [PATCH hmm 3/8] mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock Date: Wed, 11 Mar 2020 15:35:01 -0300 Message-Id: <20200311183506.3997-4-jgg@ziepe.ca> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200311183506.3997-1-jgg@ziepe.ca> References: <20200311183506.3997-1-jgg@ziepe.ca> MIME-Version: 1.0 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: From: Jason Gunthorpe This eventually calls into handle_mm_fault() which is a sleeping function= . Release the lock first. hmm_vma_walk_hole() does not touch the contents of the PUD, so it does no= t need the lock. Fixes: 3afc423632a1 ("mm: pagewalk: add p4d_entry() and pgd_entry()") Cc: Steven Price Signed-off-by: Jason Gunthorpe --- mm/hmm.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/mm/hmm.c b/mm/hmm.c index 9e8f68eb83287a..32dcbfd3908315 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -473,8 +473,8 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned lon= g start, unsigned long end, =20 pud =3D READ_ONCE(*pudp); if (pud_none(pud)) { - ret =3D hmm_vma_walk_hole(start, end, -1, walk); - goto out_unlock; + spin_unlock(ptl); + return hmm_vma_walk_hole(start, end, -1, walk); } =20 if (pud_huge(pud) && pud_devmap(pud)) { @@ -483,8 +483,8 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned lon= g start, unsigned long end, bool fault, write_fault; =20 if (!pud_present(pud)) { - ret =3D hmm_vma_walk_hole(start, end, -1, walk); - goto out_unlock; + spin_unlock(ptl); + return hmm_vma_walk_hole(start, end, -1, walk); } =20 i =3D (addr - range->start) >> PAGE_SHIFT; @@ -495,9 +495,9 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned lon= g start, unsigned long end, hmm_range_need_fault(hmm_vma_walk, pfns, npages, cpu_flags, &fault, &write_fault); if (fault || write_fault) { - ret =3D hmm_vma_walk_hole_(addr, end, fault, - write_fault, walk); - goto out_unlock; + spin_unlock(ptl); + return hmm_vma_walk_hole_(addr, end, fault, write_fault, + walk); } =20 pfn =3D pud_pfn(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT); --=20 2.25.1