From patchwork Wed May 10 04:56:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hugh Dickins X-Patchwork-Id: 13236385 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 8C742C7EE2E for ; Wed, 10 May 2023 04:56:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235509AbjEJE4y (ORCPT ); Wed, 10 May 2023 00:56:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235579AbjEJE4w (ORCPT ); Wed, 10 May 2023 00:56:52 -0400 Received: from mail-yw1-x1131.google.com (mail-yw1-x1131.google.com [IPv6:2607:f8b0:4864:20::1131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E992E1FE7 for ; Tue, 9 May 2023 21:56:48 -0700 (PDT) Received: by mail-yw1-x1131.google.com with SMTP id 00721157ae682-55a76ed088aso101621687b3.2 for ; Tue, 09 May 2023 21:56:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1683694608; x=1686286608; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:from:to:cc:subject:date:message-id:reply-to; bh=VvuiwGfmHxTbGTIrjZEu2Atjrxfj5l7d/xiFwRLchQg=; b=r94LQDZtq2Ahs+pJ02XRyENxJHGD3oe8r85F2aY3lvsikc/je1Po6VKiCqGzvG34y8 kIuRE1yIIechhFDgP3aPNUwpsvddbLpTk1K5K+zsi9h4zTnxpk/JVyiDuMs9BN+OFeXh nh4AqDsTEXGceRxF3pEZTvbfDGAiIr5yaqLJ7E2ZoOdKC1Zkn5Abo0ezT8CCDEe5hzan c+lECJHpRVibRO6qY89AP62g051JuNBSBft2ut/t1eSbSZxO5Og6LOCNCOMTH+prHdN+ QRgICMzswpXaaxM5lmYItFqDFDCHtHoD+lRFcRdM6eNSSTq3389JYb3eyyNp72I0hHaA zjZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1683694608; x=1686286608; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=VvuiwGfmHxTbGTIrjZEu2Atjrxfj5l7d/xiFwRLchQg=; b=Jk2cJieiiKK+7+A4bCV2L1oqziwzTAskSYiFjMGQSABnyh0wQ6bSTfF55HYUXxi17t gJGsAs2G4TAS8bo8CX2GW8cB6R7XKZrE2eKmtmvm6Ht39Eon/UqGQ4WKKBeX9U6wXoy3 3piYeLqflVUNsKxoOBtJbp2O5Y9D6vONhxUit9gcxfr/4PPM0LLXKw4zJEOxI9wBCS34 hIlKZon0AfBOm9mCM/S4j5/4zwtED0S5wAgAzjgCoeQHSnT4c3oNk6DszM8jr4yNuWeZ ZLz3OOL68gH3bM1sx96RveXoN0U/8vu4blHefIUROBofPPmopqE+BGGyNzxo34AMgTau bkhw== X-Gm-Message-State: AC+VfDwgqAwlvdT35kZR289QBTHZG+46rPMNAGMBvJExk+xq6oeWR+zh m8PjP6GGBwYuA0WVZ5NUYpLiXg== X-Google-Smtp-Source: ACHHUZ7AyL+rmns/Ft/OH9KHX6GHbff2/XDcrKV9m3YxNF0ibK6GlQcG44pT8V6Ez5OWany7qS8Crw== X-Received: by 2002:a0d:db49:0:b0:55a:314d:afdc with SMTP id d70-20020a0ddb49000000b0055a314dafdcmr18425257ywe.37.1683694608059; Tue, 09 May 2023 21:56:48 -0700 (PDT) Received: from ripple.attlocal.net (172-10-233-147.lightspeed.sntcca.sbcglobal.net. [172.10.233.147]) by smtp.gmail.com with ESMTPSA id f206-20020a816ad7000000b00559fb950d9fsm3842735ywc.45.2023.05.09.21.56.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 May 2023 21:56:47 -0700 (PDT) Date: Tue, 9 May 2023 21:56:44 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: Andrew Morton cc: Mike Kravetz , Mike Rapoport , "Kirill A. Shutemov" , Matthew Wilcox , David Hildenbrand , Suren Baghdasaryan , Qi Zheng , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Greg Ungerer , Michal Simek , Thomas Bogendoerfer , Helge Deller , John David Anglin , "Aneesh Kumar K.V" , Michael Ellerman , Alexandre Ghiti , Palmer Dabbelt , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda , John Paul Adrian Glaubitz , "David S. Miller" , Chris Zankel , Max Filippov , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@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-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 11/23] powerpc: kvmppc_unmap_free_pmd() pte_offset_kernel() In-Reply-To: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com> Message-ID: <8bc72262-3771-4fbf-8738-44d9a8a1ba6a@google.com> References: <77a5d8c-406b-7068-4f17-23b7ac53bc83@google.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org kvmppc_unmap_free_pmd() use pte_offset_kernel(), like everywhere else in book3s_64_mmu_radix.c: instead of pte_offset_map(), which will come to need a pte_unmap() to balance it. But note that this is a more complex case than most: see those -EAGAINs in kvmppc_create_pte(), which is coping with kvmppc races beween page table and huge entry, of the kind which we are expecting to address in pte_offset_map() - this might want to be revisited in future. Signed-off-by: Hugh Dickins --- arch/powerpc/kvm/book3s_64_mmu_radix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index 461307b89c3a..572707858d65 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -509,7 +509,7 @@ static void kvmppc_unmap_free_pmd(struct kvm *kvm, pmd_t *pmd, bool full, } else { pte_t *pte; - pte = pte_offset_map(p, 0); + pte = pte_offset_kernel(p, 0); kvmppc_unmap_free_pte(kvm, pte, full, lpid); pmd_clear(p); }