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[2620:137:e000::1:20]) by mx.google.com with ESMTP id bj10-20020a170906b04a00b0078dc5c888f1si11745223ejb.135.2022.11.15.16.53.51; Tue, 15 Nov 2022 16:54:16 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=QWcsbQT8; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230223AbiKPAoJ (ORCPT + 99 others); Tue, 15 Nov 2022 19:44:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229937AbiKPAoG (ORCPT ); Tue, 15 Nov 2022 19:44:06 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 44DDF2BB15 for ; Tue, 15 Nov 2022 16:44:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668559445; x=1700095445; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Tx19St9qzi0HfKCU80s71CDjOvtppRUy1zquC1kpDYM=; b=QWcsbQT8PktRUKx+mk+1Ijk0qlzdQu37u8+bN+DR+4kshHfGm1rkezeM LioqLDKtlHQCzA/WPTr/6rH/rBj7bgIdNcIp+jOW1MjwcTpTlh/rLtKId PHhBUNIgAvZyytAkqicx4ACxhipp/QB1ovpzCfP61r78f3wLw8rPKeXkc q9p+Y+waac5rGyotxyNoGHwNEaZLNFDTU42r7H+9rMLMgoCGcz3Xt9d5+ Rsptbxc+D0k/v38D8ks1mshGlbdrU3VE+p0GFvzDFlY4H/iMs8hr9sSAU anZS8ElYltWBIg7X8341l0P9W8Q3za1eURG7YhNjOagx2fgtbIz3boo6E g==; X-IronPort-AV: E=McAfee;i="6500,9779,10532"; a="292800212" X-IronPort-AV: E=Sophos;i="5.96,167,1665471600"; d="scan'208";a="292800212" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2022 16:44:04 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10532"; a="968210385" X-IronPort-AV: E=Sophos;i="5.96,167,1665471600"; d="scan'208";a="968210385" Received: from nrobin-mobl.ger.corp.intel.com (HELO box.shutemov.name) ([10.249.45.56]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Nov 2022 16:44:01 -0800 Received: by box.shutemov.name (Postfix, from userid 1000) id 23AB810446E; Wed, 16 Nov 2022 03:43:59 +0300 (+03) From: "Kirill A. Shutemov" To: kirill@shutemov.name Cc: dave.hansen@intel.com, dave.hansen@linux.intel.com, jejb@linux.ibm.com, kirill.shutemov@linux.intel.com, linux-kernel@vger.kernel.org, lkp@intel.com, martin.petersen@oracle.com, oe-kbuild-all@lists.linux.dev, x86@kernel.org Subject: [PATCH 2/2] x86/mm: Fix sparse warnings in untagged_ptr() Date: Wed, 16 Nov 2022 03:43:53 +0300 Message-Id: <20221116004353.15052-3-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221116004353.15052-1-kirill.shutemov@linux.intel.com> References: <20221115155802.p3vjnk7eqqcyskt3@box.shutemov.name> <20221116004353.15052-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749612029269717652?= X-GMAIL-MSGID: =?utf-8?q?1749612029269717652?= Linear Address Masking patchset triggered a lot of sparse warnings. The root cause is that casting pointer to '__typeof__(*(ptr)) *' will strip all sparse tags. The type has to be defined based on the pointer type, not based on what the pointer points to. Fix cast in untagged_ptr() and avoid __typeof__() usage in get/put_user(). Signed-off-by: Kirill A. Shutemov Reported-by: kernel test robot Tested-by: Andy Shevchenko --- arch/x86/include/asm/uaccess.h | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 1d2c79246681..bd92e1ee1c1a 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -43,7 +43,7 @@ DECLARE_STATIC_KEY_FALSE(tagged_addr_key); #define untagged_ptr(mm, ptr) ({ \ u64 __ptrval = (__force u64)(ptr); \ __ptrval = untagged_addr(mm, __ptrval); \ - (__force __typeof__(*(ptr)) *)__ptrval; \ + (__force __typeof__(ptr))__ptrval; \ }) #else #define untagged_addr(mm, addr) (addr) @@ -158,10 +158,8 @@ extern int __get_user_bad(void); */ #define get_user(x,ptr) \ ({ \ - __typeof__(*(ptr)) __user *__ptr_clean; \ - __ptr_clean = untagged_ptr(current->mm, ptr); \ might_fault(); \ - do_get_user_call(get_user,x,__ptr_clean); \ + do_get_user_call(get_user,x,untagged_ptr(current->mm, ptr)); \ }) /** @@ -263,10 +261,8 @@ extern void __put_user_nocheck_8(void); * Return: zero on success, or -EFAULT on error. */ #define put_user(x, ptr) ({ \ - __typeof__(*(ptr)) __user *__ptr_clean; \ - __ptr_clean = untagged_ptr(current->mm, ptr); \ might_fault(); \ - do_put_user_call(put_user,x,__ptr_clean); \ + do_put_user_call(put_user,x,untagged_ptr(current->mm, ptr)); \ }) /**