From patchwork Tue Mar 26 16:26:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 10871525 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BB6251390 for ; Tue, 26 Mar 2019 16:27:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A640F28C07 for ; Tue, 26 Mar 2019 16:27:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9AAC028CC8; Tue, 26 Mar 2019 16:27:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 08FA828C07 for ; Tue, 26 Mar 2019 16:27:18 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2B0786B0277; Tue, 26 Mar 2019 12:27:16 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 286856B0278; Tue, 26 Mar 2019 12:27:16 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 176A56B0279; Tue, 26 Mar 2019 12:27:16 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-ed1-f72.google.com (mail-ed1-f72.google.com [209.85.208.72]) by kanga.kvack.org (Postfix) with ESMTP id B2BA66B0277 for ; Tue, 26 Mar 2019 12:27:15 -0400 (EDT) Received: by mail-ed1-f72.google.com with SMTP id x13so5489337edq.11 for ; Tue, 26 Mar 2019 09:27:15 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=ahKSq6BT07JiMm6WJgk15VRtm9UPqW7p0TN43pTC2F8=; b=ZhWgBUhk7HKNr1qKftrZCSLs/Zp93m+Y4sB0C3QdSzQrnvk+z4OZBJfwOBmkyMAA7u fYIPMVUKfR/HvXqbLHWjLoV6pFExpiSiQ2gvO2AyrV8mOVFx+csz0Qa21Vtibls8T0Hz oSfbnl7Klm87calfCTFryoHFU38zkvMOp5fzLmKu1FvGaBWkN6HAQL3jmwhy0DJ03NXK 7+zTgafva6FMtMOh/UI2qs2H6z9qB2hvGYvU0XVntJ7BKSvJ3ewW7rVksEAWTj3EkQge TkD5pz4GHgeSMOPwvol0+c/cDKLhZCcf+XTg8apS7bXAK4xKHCQ9cgfimjIeLzHAHZf0 pHiQ== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of steven.price@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=steven.price@arm.com X-Gm-Message-State: APjAAAWAol9S4LgkGNVEc0S4dWrlFBdGxJ8u1cvMFa3p0NV0oLs3kIQ3 0SHQAgyJqou/zpS4f7zpWQFZrskEAlEym/wbwdb12Obq1KzkwQodKqFmkhjc5fORi7lrMbUkDLP Kh+inFuk072a6AUw4gOo9jIGQwLQVyuVOMZMNP68CXrDqjmWuF+8S9StlQA6tupO98A== X-Received: by 2002:a17:906:c9d0:: with SMTP id hk16mr17848306ejb.220.1553617635232; Tue, 26 Mar 2019 09:27:15 -0700 (PDT) X-Google-Smtp-Source: APXvYqzJ+fkUwGy6W1Z5gjFijmUz12y5uq2hH8HJaxPRMAGJQs5Lsqn03VSXxXVjFbaYhMXnEVkH X-Received: by 2002:a17:906:c9d0:: with SMTP id hk16mr17848256ejb.220.1553617634245; Tue, 26 Mar 2019 09:27:14 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1553617634; cv=none; d=google.com; s=arc-20160816; b=JYVl0a9TTLs4yW2qFfPlre32xZE6VJxodYOKj56lXBoBEDkkNeLVFOE+uxapK+gMRg SD4dBIxYOml2617d69xhFZMR64ufD/HL65byh8ADCuVInjSsqBxY+IKXGrMS3Q9Xe5Hv tI3KvBVWdaqVXaibpfyAh/5wcIU0BXXUtRmJR2syMjfuTNSLmwkKdQYClmtHADMsFGu5 hruIKf3+sBjHxs83ohv85uG4goD6A5pnsH3HbS0SAANvxDoMbp5Iw7dTFLvh6QxoOSQt WkJVx+Kg/wXf6edY/CscrOvCsw0Z+qWL3JHyiZaa4pC/AMVefSd/Ap/juvfjILInashg zNlg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from; bh=ahKSq6BT07JiMm6WJgk15VRtm9UPqW7p0TN43pTC2F8=; b=GLxuk8/+PNAkwLTMX/8nrgbxgcaez9RBMfGlRiL6q7lkTrNRffTnpn5K0Wy26Iic2P pldTM6r/GDIaw4MblgFDEJabiWsa9+tZxotn2/n4KsEPtbMqZzTNfNYKL4kkobd+Dmk5 EJoWeqWObDflhYo23O8Oy7Q6xLp7IBQWVO2IFNF7E98JRRjJoRG3tfFuk7eMN7o3Sd4X y5LPNi0smuDEYZkvbw+Wztna75vooLweDj+JxLnI3agVQ68DOEcjCJUJifI/xBojq6uP kS6iC9krRbLF57lt6oaP5fypn5Dp8vpi959kRkfta2Hl8dUlXlsL35kkJB0eQot+pI9V Oe7A== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of steven.price@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=steven.price@arm.com Received: from foss.arm.com (usa-sjc-mx-foss1.foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id s4si4657034edx.79.2019.03.26.09.27.13 for ; Tue, 26 Mar 2019 09:27:14 -0700 (PDT) Received-SPF: pass (google.com: domain of steven.price@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of steven.price@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=steven.price@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 410B71684; Tue, 26 Mar 2019 09:27:13 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.69]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 058A03F614; Tue, 26 Mar 2019 09:27:09 -0700 (PDT) From: Steven Price To: linux-mm@kvack.org Cc: Steven Price , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Dave Hansen , Ingo Molnar , James Morse , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Peter Zijlstra , Thomas Gleixner , Will Deacon , x86@kernel.org, "H. Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" Subject: [PATCH v6 10/19] mm: pagewalk: Add p4d_entry() and pgd_entry() Date: Tue, 26 Mar 2019 16:26:15 +0000 Message-Id: <20190326162624.20736-11-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190326162624.20736-1-steven.price@arm.com> References: <20190326162624.20736-1-steven.price@arm.com> MIME-Version: 1.0 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: X-Virus-Scanned: ClamAV using ClamSMTP pgd_entry() and pud_entry() were removed by commit 0b1fbfe50006c410 ("mm/pagewalk: remove pgd_entry() and pud_entry()") because there were no users. We're about to add users so reintroduce them, along with p4d_entry() as we now have 5 levels of tables. Note that commit a00cc7d9dd93d66a ("mm, x86: add support for PUD-sized transparent hugepages") already re-added pud_entry() but with different semantics to the other callbacks. Since there have never been upstream users of this, revert the semantics back to match the other callbacks. This means pud_entry() is called for all entries, not just transparent huge pages. Signed-off-by: Steven Price --- include/linux/mm.h | 15 +++++++++------ mm/pagewalk.c | 27 ++++++++++++++++----------- 2 files changed, 25 insertions(+), 17 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 76769749b5a5..f6de08c116e6 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1367,15 +1367,14 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, /** * mm_walk - callbacks for walk_page_range - * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry - * this handler should only handle pud_trans_huge() puds. - * the pmd_entry or pte_entry callbacks will be used for - * regular PUDs. - * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry + * @pgd_entry: if set, called for each non-empty PGD (top-level) entry + * @p4d_entry: if set, called for each non-empty P4D entry + * @pud_entry: if set, called for each non-empty PUD entry + * @pmd_entry: if set, called for each non-empty PMD entry * this handler is required to be able to handle * pmd_trans_huge() pmds. They may simply choose to * split_huge_page() instead of handling it explicitly. - * @pte_entry: if set, called for each non-empty PTE (4th-level) entry + * @pte_entry: if set, called for each non-empty PTE (lowest-level) entry * @pte_hole: if set, called for each hole at all levels * @hugetlb_entry: if set, called for each hugetlb entry * @test_walk: caller specific callback function to determine whether @@ -1390,6 +1389,10 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma, * (see the comment on walk_page_range() for more details) */ struct mm_walk { + int (*pgd_entry)(pgd_t *pgd, unsigned long addr, + unsigned long next, struct mm_walk *walk); + int (*p4d_entry)(p4d_t *p4d, unsigned long addr, + unsigned long next, struct mm_walk *walk); int (*pud_entry)(pud_t *pud, unsigned long addr, unsigned long next, struct mm_walk *walk); int (*pmd_entry)(pmd_t *pmd, unsigned long addr, diff --git a/mm/pagewalk.c b/mm/pagewalk.c index c3084ff2569d..98373a9f88b8 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -90,15 +90,9 @@ static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, } if (walk->pud_entry) { - spinlock_t *ptl = pud_trans_huge_lock(pud, walk->vma); - - if (ptl) { - err = walk->pud_entry(pud, addr, next, walk); - spin_unlock(ptl); - if (err) - break; - continue; - } + err = walk->pud_entry(pud, addr, next, walk); + if (err) + break; } split_huge_pud(walk->vma, pud, addr); @@ -131,7 +125,12 @@ static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end, break; continue; } - if (walk->pmd_entry || walk->pte_entry) + if (walk->p4d_entry) { + err = walk->p4d_entry(p4d, addr, next, walk); + if (err) + break; + } + if (walk->pud_entry || walk->pmd_entry || walk->pte_entry) err = walk_pud_range(p4d, addr, next, walk); if (err) break; @@ -157,7 +156,13 @@ static int walk_pgd_range(unsigned long addr, unsigned long end, break; continue; } - if (walk->pmd_entry || walk->pte_entry) + if (walk->pgd_entry) { + err = walk->pgd_entry(pgd, addr, next, walk); + if (err) + break; + } + if (walk->p4d_entry || walk->pud_entry || walk->pmd_entry || + walk->pte_entry) err = walk_p4d_range(pgd, addr, next, walk); if (err) break;