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=-8.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_MUTT 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 8EF93C43219 for ; Fri, 3 May 2019 10:05:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 697EA20675 for ; Fri, 3 May 2019 10:05:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726835AbfECKFS (ORCPT ); Fri, 3 May 2019 06:05:18 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:57752 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725777AbfECKFS (ORCPT ); Fri, 3 May 2019 06:05:18 -0400 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 F3CB1374; Fri, 3 May 2019 03:05:16 -0700 (PDT) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9CC463F557; Fri, 3 May 2019 03:05:11 -0700 (PDT) Date: Fri, 3 May 2019 11:05:09 +0100 From: Mark Rutland To: Mike Rapoport Cc: Andrew Morton , Arnd Bergmann , Catalin Marinas , Geert Uytterhoeven , Greentime Hu , Guan Xuetao , Guo Ren , Helge Deller , Ley Foon Tan , Matthew Wilcox , Matt Turner , Michael Ellerman , Michal Hocko , Palmer Dabbelt , Paul Burton , Richard Kuo , Richard Weinberger , Russell King , Sam Creasey , x86@kernel.org, linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-kernel@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-um@lists.infradead.org, nios2-dev@lists.rocketboards.org Subject: Re: [PATCH 04/15] arm64: switch to generic version of pte allocation Message-ID: <20190503100508.GB47811@lakrids.cambridge.arm.com> References: <1556810922-20248-1-git-send-email-rppt@linux.ibm.com> <1556810922-20248-5-git-send-email-rppt@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1556810922-20248-5-git-send-email-rppt@linux.ibm.com> User-Agent: Mutt/1.11.1+11 (2f07cb52) (2018-12-01) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Hi, On Thu, May 02, 2019 at 06:28:31PM +0300, Mike Rapoport wrote: > The PTE allocations in arm64 are identical to the generic ones modulo the > GFP flags. > > Using the generic pte_alloc_one() functions ensures that the user page > tables are allocated with __GFP_ACCOUNT set. > > The arm64 definition of PGALLOC_GFP is removed and replaced with > GFP_PGTABLE_USER for p[gum]d_alloc_one() and for KVM memory cache. > > The mappings created with create_pgd_mapping() are now using > GFP_PGTABLE_KERNEL. > > The conversion to the generic version of pte_free_kernel() removes the NULL > check for pte. > > The pte_free() version on arm64 is identical to the generic one and > can be simply dropped. > > Signed-off-by: Mike Rapoport > --- > arch/arm64/include/asm/pgalloc.h | 43 ++++------------------------------------ > arch/arm64/mm/mmu.c | 2 +- > arch/arm64/mm/pgd.c | 4 ++-- > virt/kvm/arm/mmu.c | 2 +- > 4 files changed, 8 insertions(+), 43 deletions(-) [...] > diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c > index 289f911..2ef1a53 100644 > --- a/arch/arm64/mm/pgd.c > +++ b/arch/arm64/mm/pgd.c > @@ -31,9 +31,9 @@ static struct kmem_cache *pgd_cache __ro_after_init; > pgd_t *pgd_alloc(struct mm_struct *mm) > { > if (PGD_SIZE == PAGE_SIZE) > - return (pgd_t *)__get_free_page(PGALLOC_GFP); > + return (pgd_t *)__get_free_page(GFP_PGTABLE_USER); > else > - return kmem_cache_alloc(pgd_cache, PGALLOC_GFP); > + return kmem_cache_alloc(pgd_cache, GFP_PGTABLE_USER); > } In efi_virtmap_init() we use pgd_alloc() to allocate a pgd for EFI runtime services, which we map with a special kernel page table. I'm not sure if accounting that is problematic, as it's allocated in a kernel thread off the back of an early_initcall. Just to check, Is that sound, or do we need a pgd_alloc_kernel()? Thanks, Mark.