From patchwork Tue Jun 27 03:14:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Vishal Moola X-Patchwork-Id: 13293852 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6FC73EB64DD for ; Tue, 27 Jun 2023 03:19:37 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.555729.867778 (Exim 4.92) (envelope-from ) id 1qDzEl-0003te-MM; Tue, 27 Jun 2023 03:19:27 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 555729.867778; Tue, 27 Jun 2023 03:19:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qDzEl-0003si-JD; Tue, 27 Jun 2023 03:19:27 +0000 Received: by outflank-mailman (input) for mailman id 555729; Tue, 27 Jun 2023 03:19:26 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qDzBj-0003pv-FC for xen-devel@lists.xenproject.org; Tue, 27 Jun 2023 03:16:19 +0000 Received: from mail-yw1-x1133.google.com (mail-yw1-x1133.google.com [2607:f8b0:4864:20::1133]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id fb8e17bc-1498-11ee-b237-6b7b168915f2; Tue, 27 Jun 2023 05:16:18 +0200 (CEST) Received: by mail-yw1-x1133.google.com with SMTP id 00721157ae682-5704ddda6dfso44581027b3.1 for ; Mon, 26 Jun 2023 20:16:18 -0700 (PDT) Received: from unknowna0e70b2ca394.attlocal.net ([2600:1700:2f7d:1800::16]) by smtp.googlemail.com with ESMTPSA id s4-20020a0dd004000000b0057399b3bd26sm1614798ywd.33.2023.06.26.20.16.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jun 2023 20:16:17 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: fb8e17bc-1498-11ee-b237-6b7b168915f2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1687835778; x=1690427778; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=UurGuuLzED1CKQ5+YtAa+uldlNlkULcrhOlEPtYgkts=; b=Bw6j1qqbA7rK2Dm84VNEOP66RtUUiWxR5Sye2bW+eq3uYQIAY2EgG1iwdb2DLJnhG8 GeCT0K/ZwJIKUih4HIgcFRg+mw1EU/RmQtL9RCws+bBmnGeSgMwKEqV8Sq7OOh2ekNKy KxZzPsUUwTKcYY2uR69y6/3CJ/yQh13J76r7SLJTov+ctRLrvX63ZMz8HGYd0YBMtxPR d4bJ4wdUGuyrpgX3PWgY/0ePtHqJFHhYHpUgd8NRua4eh9nOB+MqmDgdNijgrl/iljgo W4AbA6WKPV5xVJmow0GDfY5w1hM9Ipzkd6LQ2xSzFc3wc9cyZI8JF3nhcsteILote3wU 0FOQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687835778; x=1690427778; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UurGuuLzED1CKQ5+YtAa+uldlNlkULcrhOlEPtYgkts=; b=L3ZoBsDXiE8AcguSteUR6mAuEyaaiJc8ksr66+5tU9MPyhXP8vA40xXKmCK3k+l9R5 Vc/mZn9OwOYha5kDf8+HZgkoAjEk1pQYvThvf7/lB6uh59x5Hr6Zgkw4/Rdp5SEvbTJE FfRs0gdQSCYB5/J7PUdcTxbJxlpIVsbXCYCR02Ks71/QPaWeW7TdzRJAXomCZev49cuk iJshY9Brkf99x2D04xXWcnll6vJio/2tsDXxlsNJ+XdkhAS9AHeQ46dCPUZ6AMTR9s7K 3O266YPtd4vgtozxZFdbbXMxLPhaaRzukG1n3gYqugYgKv+I/JBpwwG5bU6jliWpMQ9D J0GQ== X-Gm-Message-State: AC+VfDwqQ6JC//6oyYmCoMVocpAyxz7nonuWagu9QJIMRjCm2assUWns cDdOby0mAKvjww8lhUckvJ8= X-Google-Smtp-Source: ACHHUZ48cJY/DPvk+Kk12K3DwipJ5tKtap76NQbk/m6+l8TYs0OHWXs1Miee1fTjpWtp4A4P8vJjEA== X-Received: by 2002:a81:4e88:0:b0:565:ba4b:aa81 with SMTP id c130-20020a814e88000000b00565ba4baa81mr32811368ywb.45.1687835777737; Mon, 26 Jun 2023 20:16:17 -0700 (PDT) From: "Vishal Moola (Oracle)" To: Andrew Morton , Matthew Wilcox Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Hugh Dickins , "Vishal Moola (Oracle)" , Mike Rapoport Subject: [PATCH v6 33/33] mm: Remove pgtable_{pmd, pte}_page_{ctor, dtor}() wrappers Date: Mon, 26 Jun 2023 20:14:31 -0700 Message-Id: <20230627031431.29653-34-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230627031431.29653-1-vishal.moola@gmail.com> References: <20230627031431.29653-1-vishal.moola@gmail.com> MIME-Version: 1.0 These functions are no longer necessary. Remove them and cleanup Documentation referencing them. Signed-off-by: Vishal Moola (Oracle) Acked-by: Mike Rapoport (IBM) --- Documentation/mm/split_page_table_lock.rst | 12 +++++------ .../zh_CN/mm/split_page_table_lock.rst | 14 ++++++------- include/linux/mm.h | 20 ------------------- 3 files changed, 13 insertions(+), 33 deletions(-) diff --git a/Documentation/mm/split_page_table_lock.rst b/Documentation/mm/split_page_table_lock.rst index a834fad9de12..e4f6972eb6c0 100644 --- a/Documentation/mm/split_page_table_lock.rst +++ b/Documentation/mm/split_page_table_lock.rst @@ -58,7 +58,7 @@ Support of split page table lock by an architecture =================================================== There's no need in special enabling of PTE split page table lock: everything -required is done by pgtable_pte_page_ctor() and pgtable_pte_page_dtor(), which +required is done by pagetable_pte_ctor() and pagetable_pte_dtor(), which must be called on PTE table allocation / freeing. Make sure the architecture doesn't use slab allocator for page table @@ -68,8 +68,8 @@ This field shares storage with page->ptl. PMD split lock only makes sense if you have more than two page table levels. -PMD split lock enabling requires pgtable_pmd_page_ctor() call on PMD table -allocation and pgtable_pmd_page_dtor() on freeing. +PMD split lock enabling requires pagetable_pmd_ctor() call on PMD table +allocation and pagetable_pmd_dtor() on freeing. Allocation usually happens in pmd_alloc_one(), freeing in pmd_free() and pmd_free_tlb(), but make sure you cover all PMD table allocation / freeing @@ -77,7 +77,7 @@ paths: i.e X86_PAE preallocate few PMDs on pgd_alloc(). With everything in place you can set CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK. -NOTE: pgtable_pte_page_ctor() and pgtable_pmd_page_ctor() can fail -- it must +NOTE: pagetable_pte_ctor() and pagetable_pmd_ctor() can fail -- it must be handled properly. page->ptl @@ -97,7 +97,7 @@ trick: split lock with enabled DEBUG_SPINLOCK or DEBUG_LOCK_ALLOC, but costs one more cache line for indirect access; -The spinlock_t allocated in pgtable_pte_page_ctor() for PTE table and in -pgtable_pmd_page_ctor() for PMD table. +The spinlock_t allocated in pagetable_pte_ctor() for PTE table and in +pagetable_pmd_ctor() for PMD table. Please, never access page->ptl directly -- use appropriate helper. diff --git a/Documentation/translations/zh_CN/mm/split_page_table_lock.rst b/Documentation/translations/zh_CN/mm/split_page_table_lock.rst index 4fb7aa666037..a2c288670a24 100644 --- a/Documentation/translations/zh_CN/mm/split_page_table_lock.rst +++ b/Documentation/translations/zh_CN/mm/split_page_table_lock.rst @@ -56,16 +56,16 @@ Hugetlb特定的辅助函数: 架构对分页表锁的支持 ==================== -没有必要特别启用PTE分页表锁：所有需要的东西都由pgtable_pte_page_ctor() -和pgtable_pte_page_dtor()完成，它们必须在PTE表分配/释放时被调用。 +没有必要特别启用PTE分页表锁：所有需要的东西都由pagetable_pte_ctor() +和pagetable_pte_dtor()完成，它们必须在PTE表分配/释放时被调用。 确保架构不使用slab分配器来分配页表：slab使用page->slab_cache来分配其页 面。这个区域与page->ptl共享存储。 PMD分页锁只有在你有两个以上的页表级别时才有意义。 -启用PMD分页锁需要在PMD表分配时调用pgtable_pmd_page_ctor()，在释放时调 -用pgtable_pmd_page_dtor()。 +启用PMD分页锁需要在PMD表分配时调用pagetable_pmd_ctor()，在释放时调 +用pagetable_pmd_dtor()。 分配通常发生在pmd_alloc_one()中，释放发生在pmd_free()和pmd_free_tlb() 中，但要确保覆盖所有的PMD表分配/释放路径：即X86_PAE在pgd_alloc()中预先 @@ -73,7 +73,7 @@ PMD分页锁只有在你有两个以上的页表级别时才有意义。 一切就绪后，你可以设置CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK。 -注意：pgtable_pte_page_ctor()和pgtable_pmd_page_ctor()可能失败--必 +注意：pagetable_pte_ctor()和pagetable_pmd_ctor()可能失败--必 须正确处理。 page->ptl @@ -90,7 +90,7 @@ page->ptl用于访问分割页表锁，其中'page'是包含该表的页面struc 的指针并动态分配它。这允许在启用DEBUG_SPINLOCK或DEBUG_LOCK_ALLOC的 情况下使用分页锁，但由于间接访问而多花了一个缓存行。 -PTE表的spinlock_t分配在pgtable_pte_page_ctor()中，PMD表的spinlock_t -分配在pgtable_pmd_page_ctor()中。 +PTE表的spinlock_t分配在pagetable_pte_ctor()中，PMD表的spinlock_t +分配在pagetable_pmd_ctor()中。 请不要直接访问page->ptl - -使用适当的辅助函数。 diff --git a/include/linux/mm.h b/include/linux/mm.h index 0e4d5f6d10e5..dc0f19f35424 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2873,11 +2873,6 @@ static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc) return true; } -static inline bool pgtable_pte_page_ctor(struct page *page) -{ - return pagetable_pte_ctor(page_ptdesc(page)); -} - static inline void pagetable_pte_dtor(struct ptdesc *ptdesc) { struct folio *folio = ptdesc_folio(ptdesc); @@ -2887,11 +2882,6 @@ static inline void pagetable_pte_dtor(struct ptdesc *ptdesc) lruvec_stat_sub_folio(folio, NR_PAGETABLE); } -static inline void pgtable_pte_page_dtor(struct page *page) -{ - pagetable_pte_dtor(page_ptdesc(page)); -} - pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp); static inline pte_t *pte_offset_map(pmd_t *pmd, unsigned long addr) { @@ -2993,11 +2983,6 @@ static inline bool pagetable_pmd_ctor(struct ptdesc *ptdesc) return true; } -static inline bool pgtable_pmd_page_ctor(struct page *page) -{ - return pagetable_pmd_ctor(page_ptdesc(page)); -} - static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc) { struct folio *folio = ptdesc_folio(ptdesc); @@ -3007,11 +2992,6 @@ static inline void pagetable_pmd_dtor(struct ptdesc *ptdesc) lruvec_stat_sub_folio(folio, NR_PAGETABLE); } -static inline void pgtable_pmd_page_dtor(struct page *page) -{ - pagetable_pmd_dtor(page_ptdesc(page)); -} - /* * No scalability reason to split PUD locks yet, but follow the same pattern * as the PMD locks to make it easier if we decide to. The VM should not be