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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57CDFC433EF for ; Fri, 20 May 2022 01:23:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344471AbiETBXM (ORCPT ); Thu, 19 May 2022 21:23:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344503AbiETBW6 (ORCPT ); Thu, 19 May 2022 21:22:58 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5D0162EA36 for ; Thu, 19 May 2022 18:22:27 -0700 (PDT) Received: from dggpemm500023.china.huawei.com (unknown [172.30.72.54]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4L487L0n8Pz1JCFf; Fri, 20 May 2022 09:21:02 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggpemm500023.china.huawei.com (7.185.36.83) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 20 May 2022 09:22:25 +0800 Received: from [10.174.177.243] (10.174.177.243) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 20 May 2022 09:22:24 +0800 Message-ID: Date: Fri, 20 May 2022 09:22:24 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.5.1 Subject: Re: [PATCH v3 4/6] mm: ioremap: Add arch_ioremap/iounmap() Content-Language: en-US To: Andrew Morton CC: , , , , , , , References: <20220519082552.117736-1-wangkefeng.wang@huawei.com> <20220519082552.117736-5-wangkefeng.wang@huawei.com> <20220519115210.a6e41d5a997921354400557e@linux-foundation.org> From: Kefeng Wang In-Reply-To: <20220519115210.a6e41d5a997921354400557e@linux-foundation.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2022/5/20 2:52, Andrew Morton wrote: > On Thu, 19 May 2022 16:25:50 +0800 Kefeng Wang wrote: > >> Add special hook for architecture to verify or setup addr, size >> or prot when ioremap() or iounmap(), which will make the generic >> ioremap more useful. >> >> arch_ioremap() return a pointer, >> - IS_ERR means return an error >> - NULL means continue to remap >> - a non-NULL, non-IS_ERR pointer is directly returned >> arch_iounmap() return a int value, >> - 0 means continue to vunmap >> - error code means skip vunmap and return directly >> >> ... >> >> --- a/include/asm-generic/io.h >> +++ b/include/asm-generic/io.h >> @@ -964,6 +964,30 @@ static inline void iounmap(volatile void __iomem *addr) >> #elif defined(CONFIG_GENERIC_IOREMAP) >> #include >> >> +/* >> + * Arch code can implement the following two special hooks when using GENERIC_IOREMAP >> + * arch_ioremap() return a pointer, >> + * - IS_ERR means return an error >> + * - NULL means continue to remap >> + * - a non-NULL, non-IS_ERR pointer is returned directly >> + * arch_iounmap() return a int, >> + * - 0 means continue to vunmap >> + * - error code means skip vunmap and return directly >> + */ >> +#ifndef arch_ioremap >> +static inline void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot) >> +{ >> + return NULL; >> +} > Maybe should do > > #define arch_ioremap arch_ioremap > > here > >> +#endif >> + >> +#ifndef arch_iounmap >> +static inline int arch_iounmap(void __iomem *addr) >> +{ >> + return 0; >> +} > and here. > > It shouldn't matter a lot because this file has inclusion guards. > However it seems tidier and perhaps other code will want to know > whether this was defined. Dunno. > Oh, forget to add the define part, thanks Andrew. Hi Catalin, could you help to involve them when taking them, many thanks. > Otherwise, > > Acked-by: Andrew Morton > > Please take this patch and [2/6] and [3/6] via the appropriate arm tree. > > .