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=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 42483C65BAF for ; Thu, 6 Dec 2018 15:03:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F33E820700 for ; Thu, 6 Dec 2018 15:03:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="DnMjz38Y" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F33E820700 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726263AbeLFPD2 (ORCPT ); Thu, 6 Dec 2018 10:03:28 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:32938 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726150AbeLFPD1 (ORCPT ); Thu, 6 Dec 2018 10:03:27 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=1Ww/RtAgrRIH6lz2Y8vYaAIvbz9EYN+kMxq+fYs0Tlw=; b=DnMjz38YhyM7PLXhdeLObvURP JFeTpmgs2ZwbDa7eNFJHD14PdgsM9CV2tPU8RqzROvL9wlqmr6bK3dLhEXfTvlzVFYfQZmrrdpTFW LVdAKSFw5vTPAKbxgA5D+uufgT92OWm6YMexiRoiYu5ItAJM838GjbUizzO4t/yDVAo0CKriW9Ms8 jJ14gvvvDivnMnro4WTt1hAkCOhd2zwjAsElYLNpvACeeO2It+uMNjmTebBYMnW5fIw0rwdiN2Bjg 3JV45NvYx9xhfc7a8sMs3lcr2Kxo2Fxm+Xl1lBW1YiYCEQ+nvebKobsgJHhXc20IIKAgafwuRXudN kiv695RrQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1gUvBV-0000uP-EY; Thu, 06 Dec 2018 15:03:25 +0000 Date: Thu, 6 Dec 2018 07:03:25 -0800 From: Christoph Hellwig To: Masahiro Yamada Cc: linux-kbuild@vger.kernel.org, Sam Ravnborg , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Corbet , Michal Marek Subject: Re: [PATCH 2/3] kbuild: generate asm-generic wrappers if mandatory headers are missing Message-ID: <20181206150325.GA2726@infradead.org> References: <1544009286-15705-1-git-send-email-yamada.masahiro@socionext.com> <1544009286-15705-2-git-send-email-yamada.masahiro@socionext.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1544009286-15705-2-git-send-email-yamada.masahiro@socionext.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 05, 2018 at 08:28:05PM +0900, Masahiro Yamada wrote: > Some time ago, Sam pointed out a certain degree of overwrap between > generic-y and mandatory-y. (https://lkml.org/lkml/2017/7/10/121) > > I a bit tweaked the meaning of mandatory-y; now it defines the minimum > set of ASM headers that all architectures must have. > > If arch does not have specific implementation of a mandatory header, > Kbuild will let it fallback to the asm-generic one by automatically > generating a wrapper. This will allow to drop lots of redundant > generic-y defines. > > Previously, "mandatory" was used in the context of UAPI, but I guess > this can be extended to kernel space ASM headers. How useful is it to keep the generic-y behavior around at all vs making everything useful mandatory?