From patchwork Wed Mar 31 11:55:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Bogendoerfer X-Patchwork-Id: 12175353 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 C42DBC433E0 for ; Wed, 31 Mar 2021 11:57:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A74D619C1 for ; Wed, 31 Mar 2021 11:57:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235317AbhCaL4g (ORCPT ); Wed, 31 Mar 2021 07:56:36 -0400 Received: from mx2.suse.de ([195.135.220.15]:51748 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235019AbhCaL4G (ORCPT ); Wed, 31 Mar 2021 07:56:06 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id A2D03B1E6; Wed, 31 Mar 2021 11:56:05 +0000 (UTC) From: Thomas Bogendoerfer To: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org Cc: hch@lst.de Subject: [PATCH v2 2/4] MIPS: uaccess: Added __get/__put_kernel_nofault Date: Wed, 31 Mar 2021 13:55:59 +0200 Message-Id: <20210331115603.146159-3-tsbogend@alpha.franken.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210331115603.146159-1-tsbogend@alpha.franken.de> References: <20210331115603.146159-1-tsbogend@alpha.franken.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Added __get/__put_kernel_nofault as preparation for removing get/set_fs. Signed-off-by: Thomas Bogendoerfer Reviewed-by: Christoph Hellwig --- arch/mips/include/asm/uaccess.h | 24 ++++++++++++++++++++++++ arch/mips/mm/Makefile | 4 ++++ arch/mips/mm/maccess.c | 10 ++++++++++ 3 files changed, 38 insertions(+) create mode 100644 arch/mips/mm/maccess.c diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h index d273a3857809..c5cab0b8f902 100644 --- a/arch/mips/include/asm/uaccess.h +++ b/arch/mips/include/asm/uaccess.h @@ -355,6 +355,18 @@ do { \ (val) = __gu_tmp.t; \ } +#define HAVE_GET_KERNEL_NOFAULT + +#define __get_kernel_nofault(dst, src, type, err_label) \ +do { \ + int __gu_err; \ + \ + __get_kernel_common(*((type *)(dst)), sizeof(type), \ + (__force type *)(src)); \ + if (unlikely(__gu_err)) \ + goto err_label; \ +} while (0) + #ifndef CONFIG_EVA #define __put_kernel_common(ptr, size) __put_user_common(ptr, size) #else @@ -483,6 +495,18 @@ do { \ extern void __put_user_unknown(void); +#define __put_kernel_nofault(dst, src, type, err_label) \ +do { \ + type __pu_val; \ + int __pu_err = 0; \ + \ + __pu_val = *(__force type *)(src); \ + __put_kernel_common(((type *)(dst)), sizeof(type)); \ + if (unlikely(__pu_err)) \ + goto err_label; \ +} while (0) + + /* * We're generating jump to subroutines which will be outside the range of * jump instructions diff --git a/arch/mips/mm/Makefile b/arch/mips/mm/Makefile index 865926a37775..76e3ee8882fa 100644 --- a/arch/mips/mm/Makefile +++ b/arch/mips/mm/Makefile @@ -22,6 +22,10 @@ else obj-y += uasm-mips.o endif +ifndef CONFIG_EVA +obj-y += maccess.o +endif + obj-$(CONFIG_32BIT) += ioremap.o pgtable-32.o obj-$(CONFIG_64BIT) += ioremap64.o pgtable-64.o obj-$(CONFIG_HIGHMEM) += highmem.o diff --git a/arch/mips/mm/maccess.c b/arch/mips/mm/maccess.c new file mode 100644 index 000000000000..58173842c6be --- /dev/null +++ b/arch/mips/mm/maccess.c @@ -0,0 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include + +bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +{ + /* highest bit set means kernel space */ + return (unsigned long)unsafe_src >> (BITS_PER_LONG - 1); +}