From patchwork Thu Sep 8 10:43:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Bulwahn X-Patchwork-Id: 12969932 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 1DC73C6FA82 for ; Thu, 8 Sep 2022 10:43:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230488AbiIHKnw (ORCPT ); Thu, 8 Sep 2022 06:43:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229505AbiIHKnv (ORCPT ); Thu, 8 Sep 2022 06:43:51 -0400 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1603057564; Thu, 8 Sep 2022 03:43:50 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id d2so8240493wrn.1; Thu, 08 Sep 2022 03:43:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=d6JtqoCpIIPzVyif4k/dv5ZYkBUB6IfePKT1atMhkrE=; b=i3YpqGHjfIghBE7B2AHHQSQ4CJg/w9Q1NAB/0hUwSMbJLeYwitavOc7Mb+MAeQNKBm 2kLB4pR34kNxJx04iAUi4R72t7ogR1J3b2ZJtDSlMI1nwWhlUECD6R73dW4OKtOUpH7Q kfh6AvXcJtT0l0AdZnH9USMQliFfCMRy3NJjMqmk9aCu0LUoFuwPTKk9rE8GoO49Q/rb +jYvwL9qWMI2k639dY+EjsJBXPTM1XWb2+1cK0V1ZJXB+haJbpCsoCUyWIyK3FIVu+z7 Qri6B1mZPVZhGwyySj+zRJ6fg0wc6vVKrWLLAEoufmf5qxHTK2NMqCtSSsICNMEqqFqs QIvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=d6JtqoCpIIPzVyif4k/dv5ZYkBUB6IfePKT1atMhkrE=; b=ho6Q9Qg2IeyEinU3EMB1v5Xu02sPXzjgdNn76phPhO/yIlslLnlNd12J3j+HKaYZMT WhEZIRCDYhJgRkdVLe7A6nNN0FEbl+2jSp6CGxqM42GyeCjkFlf0kgzz6KDDiP6QW1aR BMLeSLK3sMzJMrplR/xqOaIAy5+smpX5WKDOGKZMaaRCScaRsP2CqtsYhNqNdr+MYrrM WJ2i0QUfasXd+VjTOf2ZA8wGNqSs0jHCsoPd1XBYfoKEi+oDKNNZm7dCKZpe0ZDa6PlZ uHKCmGl/KTy01bzIG8JZzhDQixvHSAfOv9E+ZmzYej88Ppn1o6oSyxVu50Dg3dGw28Zi saIQ== X-Gm-Message-State: ACgBeo0D1ZImliZlpGqOK7lk19VjW/rdWgU/k+Ji/nJx5UtMj8kAb+yj 9DB+3Utmyw+TM8dObv0tDsQ= X-Google-Smtp-Source: AA6agR6kNO8n/M43thHg/IOEsLk/5DZrRuHF8/F0z7hpV+F/66eCJ2OY4AXF/hVn+/595I7QcY/wwQ== X-Received: by 2002:a5d:6f14:0:b0:228:e3c6:fa2 with SMTP id ay20-20020a5d6f14000000b00228e3c60fa2mr4194339wrb.516.1662633828524; Thu, 08 Sep 2022 03:43:48 -0700 (PDT) Received: from felia.fritz.box (200116b826f77600d0640cc051af4288.dip.versatel-1u1.de. [2001:16b8:26f7:7600:d064:cc0:51af:4288]) by smtp.gmail.com with ESMTPSA id bu3-20020a056000078300b0022863395912sm17227486wrb.53.2022.09.08.03.43.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 03:43:48 -0700 (PDT) From: Lukas Bulwahn To: Russell King , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Mauro Carvalho Chehab , linux-media@vger.kernel.org, Peter Chen , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Andrew Morton , Mike Rapoport , linux-mm@kvack.org, Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 1/6] arm: make config ARM_PATCH_PHYS_VIRT visible with EXPERT Date: Thu, 8 Sep 2022 12:43:32 +0200 Message-Id: <20220908104337.11940-2-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220908104337.11940-1-lukas.bulwahn@gmail.com> References: <20220908104337.11940-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Commit 6a108a14fa35 ("kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT") introduces CONFIG_EXPERT to carry the previous intent of CONFIG_EMBEDDED and just gives that intent a much better name. That has been clearly a good and long overdue renaming, and it is clearly an improvement to the kernel build configuration that has shown to help managing the kernel build configuration in the last decade. However, rather than bravely and radically just deleting CONFIG_EMBEDDED, this commit gives CONFIG_EMBEDDED a new intended semantics, but keeps it open for future contributors to implement that intended semantics: A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Since then, this CONFIG_EMBEDDED implicitly had two purposes: - It can make even more options visible beyond what CONFIG_EXPERT makes visible. In other words, it may introduce another level of enabling the visibility of configuration options: always visible, visible with CONFIG_EXPERT and visible with CONFIG_EMBEDDED. - Set certain default values of some configurations differently, following the assumption that configuring a kernel build for an embedded system generally starts with a different set of default values compared to kernel builds for all other kind of systems. Considering the first purpose, at the point in time where CONFIG_EMBEDDED was renamed to CONFIG_EXPERT, CONFIG_EXPERT already made 130 more options become visible throughout all different menus for the kernel configuration. Over the last decade, this has gradually increased, so that currently, with CONFIG_EXPERT, roughly 170 more options become visible throughout all different menus for the kernel configuration. In comparison, currently with CONFIG_EMBEDDED enabled, just seven more options are visible, one in x86, one in arm, and five for the ChipIdea Highspeed Dual Role Controller. As the numbers suggest, these two levels of enabling the visibility of even more configuration options---beyond what CONFIG_EXPERT enables---never evolved to a good solution in the last decade. In other words, this additional level of visibility of configuration option with CONFIG_EMBEDDED compared to CONFIG_EXPERT has since its introduction never become really valuable. It requires quite some investigation to actually understand what is additionally visible and it does not differ significantly in complexity compared to just enabling CONFIG_EXPERT. This CONFIG_EMBEDDED---or any other config to show more detailed options beyond CONFIG_EXPERT---is unlikely to be valuable unless somebody puts significant effort in identifying how such visibility options can be properly split and creating clear criteria, when some config option is visible with CONFIG_EXPERT and when some config option is visible only with some further option enabled beyond CONFIG_EXPERT, such as CONFIG_EMBEDDED attempted to do. For now, it is much more reasonable to simply make those additional seven options that visible with CONFIG_EMBEDDED, visible with CONFIG_EXPERT, and then remove CONFIG_EMBEDDED. If anyone spends significant effort in structuring the visibility of config options, they may re-introduce suitable new config options simply as they see fit. Make the config ARM_PATCH_PHYS_VIRT visible when CONFIG_EXPERT is enabled. Signed-off-by: Lukas Bulwahn Reviewed-by: Masahiro Yamada --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 4adfa5dd3556..4b212ab1b281 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -243,7 +243,7 @@ config ARCH_MTD_XIP bool config ARM_PATCH_PHYS_VIRT - bool "Patch physical to virtual translations at runtime" if EMBEDDED + bool "Patch physical to virtual translations at runtime" if EXPERT default y depends on !XIP_KERNEL && MMU help From patchwork Thu Sep 8 10:43:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Bulwahn X-Patchwork-Id: 12969933 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 39305C38145 for ; Thu, 8 Sep 2022 10:44:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231249AbiIHKoF (ORCPT ); Thu, 8 Sep 2022 06:44:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231144AbiIHKny (ORCPT ); Thu, 8 Sep 2022 06:43:54 -0400 Received: from mail-wm1-x32f.google.com (mail-wm1-x32f.google.com [IPv6:2a00:1450:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F85E9D8ED; Thu, 8 Sep 2022 03:43:52 -0700 (PDT) Received: by mail-wm1-x32f.google.com with SMTP id 186-20020a1c02c3000000b003b26feb5c6bso1352196wmc.5; Thu, 08 Sep 2022 03:43:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=YcRQWeHsNHudXowYxhzrFSu3g61QameARaQdQJb5lU8=; b=g3G7qs40MLQJX14/onOdc/vwEuCiGg3qlXRS98ERCemYZhBI59bvkmMyGLr09yHXS/ yFosfFbqEKXH3p/CfgCOl/rnQhKEtFaDJTjdwAl2E9NoJNZ8YIVubxdleDB/f0g4+3oo JIeGMlGuo3uFUW4fDwCEy9M1RHT2k/t4jVo48Ln/eFseeN1oVe9bh0vMtHB5XTVOMXlQ BfukHii/KG8jzkRD5yeoihVnAl+O4D3cCY+SL/5O/X6oM9T0JNIC31tvygvv5sDkdBMp C81T8fKmjXFOmCxs6csbtglXCTBnAX8JxPtOwKgLbEgviTauwuYqLNDYQ4p+gnFdpP+i HV8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=YcRQWeHsNHudXowYxhzrFSu3g61QameARaQdQJb5lU8=; b=bLws0u7gqf5mdU/P7joaZoL+Tc8iE2IyPybnfHndtMVDtAGKDG02GrhQXwqwZhYS3l ybzhxp2oxNYDCDKKCzNwlUDcAxAZF0GvOy+1OOQ1gF6sDkGc5X8FxHkGGcLQmsIV63qc KOzQ+PPdpFLvHsFtcoYut2AZe/pDxL+mIan75rSxHGm/bA65x3VJrGxk9bhD2ilTDL+k hRU7b61Dz+513VLqtbuYVqJPUjOKiXL7fexDBLQx5pIEC9xq0Q3S2ohNcDsXqT5UMjRn OjPDeBRLbL76iVNQ/gM0MHSoezU5qmvXHRWsfdil+jYakONWGcJYruXVbXTrF/E/xpfa tPOg== X-Gm-Message-State: ACgBeo1uV2URTjeEcRe9aP1ptyXX75t9/P9131Nqdtj18p+pXDvZryvv tti0TXq8xcjn+5YUzh9W0Sk= X-Google-Smtp-Source: AA6agR6ynOlAaxihPYz+CdT04VP+VpGksNMzS5VFetSq0N8fvehilNxf41zef99BhDZbNdGwjrNtVg== X-Received: by 2002:a05:600c:4f10:b0:3a5:f8c8:a5b5 with SMTP id l16-20020a05600c4f1000b003a5f8c8a5b5mr1835323wmq.34.1662633830474; Thu, 08 Sep 2022 03:43:50 -0700 (PDT) Received: from felia.fritz.box (200116b826f77600d0640cc051af4288.dip.versatel-1u1.de. [2001:16b8:26f7:7600:d064:cc0:51af:4288]) by smtp.gmail.com with ESMTPSA id bu3-20020a056000078300b0022863395912sm17227486wrb.53.2022.09.08.03.43.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 03:43:50 -0700 (PDT) From: Lukas Bulwahn To: Russell King , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Mauro Carvalho Chehab , linux-media@vger.kernel.org, Peter Chen , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Andrew Morton , Mike Rapoport , linux-mm@kvack.org, Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 2/6] x86: make config X86_FEATURE_NAMES visible with EXPERT Date: Thu, 8 Sep 2022 12:43:33 +0200 Message-Id: <20220908104337.11940-3-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220908104337.11940-1-lukas.bulwahn@gmail.com> References: <20220908104337.11940-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Commit 6a108a14fa35 ("kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT") introduces CONFIG_EXPERT to carry the previous intent of CONFIG_EMBEDDED and just gives that intent a much better name. That has been clearly a good and long overdue renaming, and it is clearly an improvement to the kernel build configuration that has shown to help managing the kernel build configuration in the last decade. However, rather than bravely and radically just deleting CONFIG_EMBEDDED, this commit gives CONFIG_EMBEDDED a new intended semantics, but keeps it open for future contributors to implement that intended semantics: A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Since then, this CONFIG_EMBEDDED implicitly had two purposes: - It can make even more options visible beyond what CONFIG_EXPERT makes visible. In other words, it may introduce another level of enabling the visibility of configuration options: always visible, visible with CONFIG_EXPERT and visible with CONFIG_EMBEDDED. - Set certain default values of some configurations differently, following the assumption that configuring a kernel build for an embedded system generally starts with a different set of default values compared to kernel builds for all other kind of systems. Considering the first purpose, at the point in time where CONFIG_EMBEDDED was renamed to CONFIG_EXPERT, CONFIG_EXPERT already made 130 more options become visible throughout all different menus for the kernel configuration. Over the last decade, this has gradually increased, so that currently, with CONFIG_EXPERT, roughly 170 more options become visible throughout all different menus for the kernel configuration. In comparison, currently with CONFIG_EMBEDDED enabled, just seven more options are visible, one in x86, one in arm, and five for the ChipIdea Highspeed Dual Role Controller. As the numbers suggest, these two levels of enabling the visibility of even more configuration options---beyond what CONFIG_EXPERT enables---never evolved to a good solution in the last decade. In other words, this additional level of visibility of configuration option with CONFIG_EMBEDDED compared to CONFIG_EXPERT has since its introduction never become really valuable. It requires quite some investigation to actually understand what is additionally visible and it does not differ significantly in complexity compared to just enabling CONFIG_EXPERT. This CONFIG_EMBEDDED---or any other config to show more detailed options beyond CONFIG_EXPERT---is unlikely to be valuable unless somebody puts significant effort in identifying how such visibility options can be properly split and creating clear criteria, when some config option is visible with CONFIG_EXPERT and when some config option is visible only with some further option enabled beyond CONFIG_EXPERT, such as CONFIG_EMBEDDED attempted to do. For now, it is much more reasonable to simply make those additional seven options that visible with CONFIG_EMBEDDED, visible with CONFIG_EXPERT, and then remove CONFIG_EMBEDDED. If anyone spends significant effort in structuring the visibility of config options, they may re-introduce suitable new config options simply as they see fit. Make the config X86_FEATURE_NAMES visible when CONFIG_EXPERT is enabled. Signed-off-by: Lukas Bulwahn Reviewed-by: Masahiro Yamada --- arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2ec0b1eabe86..7807eb1c8df8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -438,7 +438,7 @@ config SMP If you don't know what to do here, say N. config X86_FEATURE_NAMES - bool "Processor feature human-readable names" if EMBEDDED + bool "Processor feature human-readable names" if EXPERT default y help This option compiles in a table of x86 feature bits and corresponding From patchwork Thu Sep 8 10:43:34 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Bulwahn X-Patchwork-Id: 12969934 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 082B5C6FA82 for ; Thu, 8 Sep 2022 10:44:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231316AbiIHKoG (ORCPT ); Thu, 8 Sep 2022 06:44:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231138AbiIHKny (ORCPT ); Thu, 8 Sep 2022 06:43:54 -0400 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BED1895E47; Thu, 8 Sep 2022 03:43:53 -0700 (PDT) Received: by mail-wr1-x42f.google.com with SMTP id b17so11992776wrq.3; Thu, 08 Sep 2022 03:43:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=1rzZX/1McMI2OMkoPvvFr/UQWTuPUFvfAYq4p+jSuaA=; b=VRorr6pMuOlY5WemwF+arYO6JWw4r0qOblVAxtDIQzme7dRnKR6MDAVSKi8YBmYYgE KFuA6+oxh7Vdn5xbP4TVLmeCcMuZsznwPcrzQiJfOb1nOb3l9ymw9LCtpHmd0e7sm8Wt 9iiRHsxqlUCab3e5XEnCD7+xmGr6craJhJ7c8EKWG6bfrtuSF0DleSGogngof3TpUwHw 6rbkiFtfYUaE6clQvQ6RNDqaq963NBnZzG8vhO4ib5MT1+FLfuZf8aIlhLiIKCfCVF3A j208xXgxbgJ7+whHhA/75D3WZwlT6s2btbRl0mCKC7kNO4Tv+acrBipHVdlTqKrCqIy0 xveQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=1rzZX/1McMI2OMkoPvvFr/UQWTuPUFvfAYq4p+jSuaA=; b=QEwstIcHjwGejhYjxOmkRcnL/qAjr1UbcJPn1bMPwBmAk5UhP13nt9KW4tTnrofbSm IxkIGxjuefk9cacz+HO0ytTCn6ofDPprxw8kKckRTxKJXBAziLY86pZBU53YO5LsR0iQ btV6VJfkhZDOpDuF1xB0LKx8B1s3jtwcTqzviG38zrguBk6ZzsHTUjdBU0qLCDYIn2n1 iW1ka59Gb1TvMIAzg+QUlmA0vXTmaUqthVfTmKlAFvREltuVTpho/GvuiFcH0wxc7gnC rwPdZ+jvm15TeDmLuXRwY5N52Jv95ZP9kb4pGduo1zypj3c3qYs/sYjC3UpyztASlH9i iWBA== X-Gm-Message-State: ACgBeo1EVdTULQ6D11dK9VJXk+zU3EQIc/PPYdE1Z58FhjY8YgwJdZHF mc2WGet/Ui2i12i6/SzmP1Q= X-Google-Smtp-Source: AA6agR42mzTr6nwpI2AtStNx5TNTUKx+v0UbikiWxS3BnLb2v/i1vUVqb+NqvRQGBQmbBS6obXyYbA== X-Received: by 2002:adf:fb46:0:b0:228:6443:c934 with SMTP id c6-20020adffb46000000b002286443c934mr4880050wrs.431.1662633832269; Thu, 08 Sep 2022 03:43:52 -0700 (PDT) Received: from felia.fritz.box (200116b826f77600d0640cc051af4288.dip.versatel-1u1.de. [2001:16b8:26f7:7600:d064:cc0:51af:4288]) by smtp.gmail.com with ESMTPSA id bu3-20020a056000078300b0022863395912sm17227486wrb.53.2022.09.08.03.43.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 03:43:51 -0700 (PDT) From: Lukas Bulwahn To: Russell King , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Mauro Carvalho Chehab , linux-media@vger.kernel.org, Peter Chen , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Andrew Morton , Mike Rapoport , linux-mm@kvack.org, Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 3/6] media: remove reference to CONFIG_EMBEDDED in MEDIA_SUPPORT_FILTER Date: Thu, 8 Sep 2022 12:43:34 +0200 Message-Id: <20220908104337.11940-4-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220908104337.11940-1-lukas.bulwahn@gmail.com> References: <20220908104337.11940-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org The config EMBEDDED selects EXPERT, i.e., when EMBEDDED is enabled, EXPERT is usually also enabled. Hence, it sufficient to have the option MEDIA_SUPPORT_FILTER set to y if !EXPERT. This way, MEDIA_SUPPORT_FILTER does not refer to CONFIG_EMBEDDED anymore and allows us to remove CONFIG_EMBEDDED in the close future. Remove the reference to CONFIG_EMBEDDED in MEDIA_SUPPORT_FILTER. Signed-off-by: Lukas Bulwahn Reviewed-by: Mauro Carvalho Chehab Reviewed-by: Masahiro Yamada --- drivers/media/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/Kconfig b/drivers/media/Kconfig index ba6592b3dab2..283b78b5766e 100644 --- a/drivers/media/Kconfig +++ b/drivers/media/Kconfig @@ -24,7 +24,7 @@ if MEDIA_SUPPORT config MEDIA_SUPPORT_FILTER bool "Filter media drivers" - default y if !EMBEDDED && !EXPERT + default y if !EXPERT help Configuring the media subsystem can be complex, as there are hundreds of drivers and other config options. From patchwork Thu Sep 8 10:43:35 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Bulwahn X-Patchwork-Id: 12969935 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 1E928C38145 for ; Thu, 8 Sep 2022 10:44:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231440AbiIHKoK (ORCPT ); Thu, 8 Sep 2022 06:44:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53412 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231284AbiIHKoG (ORCPT ); Thu, 8 Sep 2022 06:44:06 -0400 Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 57F01901B9; Thu, 8 Sep 2022 03:43:56 -0700 (PDT) Received: by mail-wr1-x42d.google.com with SMTP id t7so20317382wrm.10; Thu, 08 Sep 2022 03:43:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=DAvW/j/5PxDjN0idhO6jbr+d99JWnLewou5/uVrgjpw=; b=BjftNcUlKNzBBVcZwF15+1/SUUs6ojyiGx+bmwJqOwI5zKTtIVhoNVvdW8TIaVaAps aFmzTJUK0Ef6cg7zBmV6LX/dGZoPVKPVveNp1rNUaW++nGkfDSyUmRTu68aOk96Ga0kb fSRCjPZQ3DYljHvB7IJp1AYr6FdAu44RzyJZFwdMk6cECanW5F4IsNN8672rXQmOhGgT w5Q43+vhG98S2dBXQrlNbW2OC34mTsABkWOS4wxUoD2d1eAAAGk1Qotds/77Bze+3n9P EXcygbRWdDU5R1rHXmu76wKLlz4ntHJmGuu2+SKMsGn0qkR8sbyLSpyCEz6H6QMxjmAq pTUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=DAvW/j/5PxDjN0idhO6jbr+d99JWnLewou5/uVrgjpw=; b=z2en7F8eCx7xUmmrP3FKhd51vbRcFayAo7F/LBSAFgjXx25ma5NFWgY6GQCd4imf6J GojwT0ktSmwdBEHvgU2cz6AuhCrp/ylhL9pGtm8W5pSZLruSJvNcjWaUJgALy90H+VqM /zy5C0aQ6JKrmdur5Yax3yr8EdTkzbB/0v8tK+/rgKwxTrf8tX+3LIU8ofh90YmElpEK pTrFs36D9xVUk2t6N0RBLMU3jJa/eGZzgV2RvJl1oOXJPhRyp//IKEH688QciPuC2U0c ysXO/zE/4FHTYf/GAGubR5TzSuLDapQZsZE9oROmxjUgjbisLehv69eUOn4vncD2zy3L iJ6A== X-Gm-Message-State: ACgBeo17pfV3rRNgyD+iBiomz/tZf48U2ohQa/u/2g/2QR7QWg/aZ/IE 1jCjVyjM424hAusW0J8NjNY= X-Google-Smtp-Source: AA6agR5QOaqvtIoVx5Bin2x+wiRcH4moEJJlXrbG8Yn8LK7Igv7M/jtpddN3oejEBKPK9FGt4HnrHg== X-Received: by 2002:a5d:6802:0:b0:228:d6e9:6dd8 with SMTP id w2-20020a5d6802000000b00228d6e96dd8mr4963144wru.710.1662633834261; Thu, 08 Sep 2022 03:43:54 -0700 (PDT) Received: from felia.fritz.box (200116b826f77600d0640cc051af4288.dip.versatel-1u1.de. [2001:16b8:26f7:7600:d064:cc0:51af:4288]) by smtp.gmail.com with ESMTPSA id bu3-20020a056000078300b0022863395912sm17227486wrb.53.2022.09.08.03.43.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 03:43:53 -0700 (PDT) From: Lukas Bulwahn To: Russell King , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Mauro Carvalho Chehab , linux-media@vger.kernel.org, Peter Chen , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Andrew Morton , Mike Rapoport , linux-mm@kvack.org, Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 4/6] usb: chipidea: make configs for glue drivers visible with EXPERT Date: Thu, 8 Sep 2022 12:43:35 +0200 Message-Id: <20220908104337.11940-5-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220908104337.11940-1-lukas.bulwahn@gmail.com> References: <20220908104337.11940-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Commit 6a108a14fa35 ("kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT") introduces CONFIG_EXPERT to carry the previous intent of CONFIG_EMBEDDED and just gives that intent a much better name. That has been clearly a good and long overdue renaming, and it is clearly an improvement to the kernel build configuration that has shown to help managing the kernel build configuration in the last decade. However, rather than bravely and radically just deleting CONFIG_EMBEDDED, this commit gives CONFIG_EMBEDDED a new intended semantics, but keeps it open for future contributors to implement that intended semantics: A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Since then, this CONFIG_EMBEDDED implicitly had two purposes: - It can make even more options visible beyond what CONFIG_EXPERT makes visible. In other words, it may introduce another level of enabling the visibility of configuration options: always visible, visible with CONFIG_EXPERT and visible with CONFIG_EMBEDDED. - Set certain default values of some configurations differently, following the assumption that configuring a kernel build for an embedded system generally starts with a different set of default values compared to kernel builds for all other kind of systems. Considering the first purpose, at the point in time where CONFIG_EMBEDDED was renamed to CONFIG_EXPERT, CONFIG_EXPERT already made 130 more options become visible throughout all different menus for the kernel configuration. Over the last decade, this has gradually increased, so that currently, with CONFIG_EXPERT, roughly 170 more options become visible throughout all different menus for the kernel configuration. In comparison, currently with CONFIG_EMBEDDED enabled, just seven more options are visible, one in x86, one in arm, and five for the ChipIdea Highspeed Dual Role Controller. As the numbers suggest, these two levels of enabling the visibility of even more configuration options---beyond what CONFIG_EXPERT enables---never evolved to a good solution in the last decade. In other words, this additional level of visibility of configuration option with CONFIG_EMBEDDED compared to CONFIG_EXPERT has since its introduction never become really valuable. It requires quite some investigation to actually understand what is additionally visible and it does not differ significantly in complexity compared to just enabling CONFIG_EXPERT. This CONFIG_EMBEDDED---or any other config to show more detailed options beyond CONFIG_EXPERT---is unlikely to be valuable unless somebody puts significant effort in identifying how such visibility options can be properly split and creating clear criteria, when some config option is visible with CONFIG_EXPERT and when some config option is visible only with some further option enabled beyond CONFIG_EXPERT, such as CONFIG_EMBEDDED attempted to do. For now, it is much more reasonable to simply make those additional seven options that visible with CONFIG_EMBEDDED, visible with CONFIG_EXPERT, and then remove CONFIG_EMBEDDED. If anyone spends significant effort in structuring the visibility of config options, they may re-introduce suitable new config options simply as they see fit. Make the configs for usb chipidea glue drivers visible when CONFIG_EXPERT is enabled. Signed-off-by: Lukas Bulwahn Reviewed-by: Masahiro Yamada --- drivers/usb/chipidea/Kconfig | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig index 661818e8fed6..c815824a0b2d 100644 --- a/drivers/usb/chipidea/Kconfig +++ b/drivers/usb/chipidea/Kconfig @@ -34,26 +34,26 @@ config USB_CHIPIDEA_HOST ChipIdea driver. config USB_CHIPIDEA_PCI - tristate "Enable PCI glue driver" if EMBEDDED + tristate "Enable PCI glue driver" if EXPERT depends on USB_PCI depends on NOP_USB_XCEIV default USB_CHIPIDEA config USB_CHIPIDEA_MSM - tristate "Enable MSM hsusb glue driver" if EMBEDDED + tristate "Enable MSM hsusb glue driver" if EXPERT default USB_CHIPIDEA config USB_CHIPIDEA_IMX - tristate "Enable i.MX USB glue driver" if EMBEDDED + tristate "Enable i.MX USB glue driver" if EXPERT depends on OF default USB_CHIPIDEA config USB_CHIPIDEA_GENERIC - tristate "Enable generic USB2 glue driver" if EMBEDDED + tristate "Enable generic USB2 glue driver" if EXPERT default USB_CHIPIDEA config USB_CHIPIDEA_TEGRA - tristate "Enable Tegra USB glue driver" if EMBEDDED + tristate "Enable Tegra USB glue driver" if EXPERT depends on OF default USB_CHIPIDEA From patchwork Thu Sep 8 10:43:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Bulwahn X-Patchwork-Id: 12969937 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 0A227C38145 for ; Thu, 8 Sep 2022 10:44:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231487AbiIHKoW (ORCPT ); Thu, 8 Sep 2022 06:44:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53472 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231292AbiIHKoG (ORCPT ); Thu, 8 Sep 2022 06:44:06 -0400 Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5044BB90E; Thu, 8 Sep 2022 03:43:56 -0700 (PDT) Received: by mail-wm1-x333.google.com with SMTP id k17so10572338wmr.2; Thu, 08 Sep 2022 03:43:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=RDfo3bMr+JPT0XwUqpEkdXAA/w6q2WGGKmvqZnqv+TQ=; b=Fw4IKH8ap4pumBI12Nq1Lfh9UtKeAcIDpwe+b1cX00pCYnpLbbi+7TinfG2yAn37L8 04V+5lVNVeT7IoxTbICeOOJhv1i6FAQCJB08146+bhoKQNtIDt3xvNsvk6HTXCBqHFM3 N6LDDtIOq8qwPGklXmHEsyu6FkeprRxH3Exu5bKLnJaqtWALAamiEythWkn8NzQQ+8NC txG9S13vwDKVmWy390YKikVWb8EjCqwWoURsQoLOsRXaO5r05Xy2D3/TxKFA1vhOwV5l k/pfHLouALbI5XPTSW97BlFXSnjAB6iK1gfU5LBfKvbTddVEbjqCmqVKQqCV+KQvE2Gq knlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=RDfo3bMr+JPT0XwUqpEkdXAA/w6q2WGGKmvqZnqv+TQ=; b=l4s46F7h9gmZxnGSKEZoOkCDPTH0/41fNpaqRWrhEUbNxS+xqBe+1lmlZ79Urqic71 F6+vFiNqrtR+tNBP3D8iPv7irPW0mIjoo+PInKuq9CXItdYnGRqgVJCb/MAYI7m6MRpK iu2M82UWksAMmnyHpBtCtPu+PpjQewWHr+kugZmBOMiVOzL6tBxR7CIgrZWDeqS/dDOY /fu0xiIifnm8ZpMwrOc9cjSc2azfAwI+mMCG4xr7gPinFMifVsPKXnEu+Jx1MOQ94NhJ De8gZQGWYoGok6d0Z7QBj8GLnwgibsBHEJBxzQ/jyo1fBz7ALz0GdfZCet4nhUW+d6Ql aIJQ== X-Gm-Message-State: ACgBeo3FeyBNoQXNnlZa6pYTWwJRo0E65uc65TCrtsrXMy1YVFgNBo3F GQg+JR2GeiIVqGoQmM59E+U= X-Google-Smtp-Source: AA6agR6LWwrUGGfoOSbVk9oxNX8imZLStpZ8izPiLHM9p+m8rli2GQHNjyDS5uL1kEKQueemyub1Qg== X-Received: by 2002:a1c:6a0a:0:b0:3a5:bcad:f2cc with SMTP id f10-20020a1c6a0a000000b003a5bcadf2ccmr1823007wmc.74.1662633836389; Thu, 08 Sep 2022 03:43:56 -0700 (PDT) Received: from felia.fritz.box (200116b826f77600d0640cc051af4288.dip.versatel-1u1.de. [2001:16b8:26f7:7600:d064:cc0:51af:4288]) by smtp.gmail.com with ESMTPSA id bu3-20020a056000078300b0022863395912sm17227486wrb.53.2022.09.08.03.43.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 03:43:56 -0700 (PDT) From: Lukas Bulwahn To: Russell King , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Mauro Carvalho Chehab , linux-media@vger.kernel.org, Peter Chen , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Andrew Morton , Mike Rapoport , linux-mm@kvack.org, Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 5/6] mm: Kconfig: make config SECRETMEM visible with EXPERT Date: Thu, 8 Sep 2022 12:43:36 +0200 Message-Id: <20220908104337.11940-6-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220908104337.11940-1-lukas.bulwahn@gmail.com> References: <20220908104337.11940-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Commit 6a108a14fa35 ("kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT") introduces CONFIG_EXPERT to carry the previous intent of CONFIG_EMBEDDED and just gives that intent a much better name. That has been clearly a good and long overdue renaming, and it is clearly an improvement to the kernel build configuration that has shown to help managing the kernel build configuration in the last decade. However, rather than bravely and radically just deleting CONFIG_EMBEDDED, this commit gives CONFIG_EMBEDDED a new intended semantics, but keeps it open for future contributors to implement that intended semantics: A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Since then, this CONFIG_EMBEDDED implicitly had two purposes: - It can make even more options visible beyond what CONFIG_EXPERT makes visible. In other words, it may introduce another level of enabling the visibility of configuration options: always visible, visible with CONFIG_EXPERT and visible with CONFIG_EMBEDDED. - Set certain default values of some configurations differently, following the assumption that configuring a kernel build for an embedded system generally starts with a different set of default values compared to kernel builds for all other kind of systems. Considering the second purpose, note that already probably arguing that a kernel build for an embedded system would choose some values differently is already tricky: the set of embedded systems with Linux kernels is already quite diverse. Many embedded system have powerful CPUs and it would not be clear that all embedded systems just optimize towards one specific aspect, e.g., a smaller kernel image size. So, it is unclear if starting with "one set of default configuration" that is induced by CONFIG_EMBEDDED is a good offer for developers configuring their kernels. Also, the differences of needed user-space features in an embedded system compared to a non-embedded system are probably difficult or even impossible to name in some generic way. So it is not surprising that in the last decade hardly anyone has contributed changes to make something default differently in case of CONFIG_EMBEDDED=y. Currently, in v6.0-rc4, SECRETMEM is the only config switched off if CONFIG_EMBEDDED=y. As long as that is actually the only option that currently is selected or deselected, it is better to just make SECRETMEM configurable at build time by experts using menuconfig instead. Make SECRETMEM configurable when EXPERT is set and otherwise default to yes. Further, SECRETMEM needs ARCH_HAS_SET_DIRECT_MAP. This allows us to remove CONFIG_EMBEDDED in the close future. Signed-off-by: Lukas Bulwahn Acked-by: Mike Rapoport Reviewed-by: Masahiro Yamada --- mm/Kconfig | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/Kconfig b/mm/Kconfig index ceec438c0741..aa154c20b129 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1068,7 +1068,13 @@ config IO_MAPPING bool config SECRETMEM - def_bool ARCH_HAS_SET_DIRECT_MAP && !EMBEDDED + default y + bool "Enable memfd_secret() system call" if EXPERT + depends on ARCH_HAS_SET_DIRECT_MAP + help + Enable the memfd_secret() system call with the ability to create + memory areas visible only in the context of the owning process and + not mapped to other processes and other kernel page tables. config ANON_VMA_NAME bool "Anonymous VMA name support" From patchwork Thu Sep 8 10:43:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Bulwahn X-Patchwork-Id: 12969936 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 F3B5CECAAD5 for ; Thu, 8 Sep 2022 10:44:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231387AbiIHKoP (ORCPT ); Thu, 8 Sep 2022 06:44:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231377AbiIHKoI (ORCPT ); Thu, 8 Sep 2022 06:44:08 -0400 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2AE4CE1272; Thu, 8 Sep 2022 03:44:00 -0700 (PDT) Received: by mail-wr1-x432.google.com with SMTP id t14so18053922wrx.8; Thu, 08 Sep 2022 03:43:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date; bh=ItPI0MR3NN2HvuVuI/7ScAvDP5QuDEGNBgMAv6on+2k=; b=Qwl9qXCtUZAEXBRAr7K21sULv09wLNrYWhe7Tqgxdgq8iCs2UNVpXTmHLSihAYrMFB xqPp1w6KiUfXyae1qXE7yYG9/WlBAVSqzQfBQppoR0nPN8/NZV1q0qC81qPEpT25B8j9 lv7K1Tpd3eqjlYr9uZR05QBI+Ee4WyqYEiDi9gEeYKP1NfX30ewVC9KM6uc+aeFNKGAU Vhb4Z4anKzyJmunTqHDt5RrnC6twaekPXm8GT/lUid5tNmlUGLYLN5l7IWiShbEWuYJt 7sMZoOZOaRVd/OzmXh+IhauAAXAbWstN4pdCv0Z2S02OqUX22yUA5TSbAYhrseEmfD1z jEaA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date; bh=ItPI0MR3NN2HvuVuI/7ScAvDP5QuDEGNBgMAv6on+2k=; b=WrDMYHZPbZQpVzRumXYHgVqarESs3HXnEMn1rKthqMJwFiM/LpT6s/yzeOvMuVdMm+ mraf4r6mYlVRSvN0DszBQGuXqChTU3SZR9e18DDp74w6aZFdVQkqMryRcpR/5770u0a+ xJOz/+81GwVVep9WUPBY4GtRgNMj0uofOqOhW5x41bLKnb1oTD/UyHZijhvx3bXAgWD3 Zw742b2ujLYthBDClxJB75PCsCEX2Ap74lJAmrjgOQ9VZLhRkwRfokFeu/UDoAOZCK7I Svoy2I6H7HaNhsGhHRZPt1C8F5QgH//rkeRFpYvh1rr9gB7RNkrzFZeYk0+qNrZHZC9h K5sw== X-Gm-Message-State: ACgBeo1kxTzyj2aRf8raxcFw/2lnGIA4maPCt/Bm8rkKCzOnkFfw0rH8 ojfzxeBfg3VISLUww6aUMSQ= X-Google-Smtp-Source: AA6agR6RYLcqVQoPCUZV9g02cRKPZpdef5LX5qakouTpz1Mv2m826gHTOyz4Ytc64G6rdcluoww9GA== X-Received: by 2002:adf:ee89:0:b0:228:7bdf:47d with SMTP id b9-20020adfee89000000b002287bdf047dmr4535843wro.641.1662633838474; Thu, 08 Sep 2022 03:43:58 -0700 (PDT) Received: from felia.fritz.box (200116b826f77600d0640cc051af4288.dip.versatel-1u1.de. [2001:16b8:26f7:7600:d064:cc0:51af:4288]) by smtp.gmail.com with ESMTPSA id bu3-20020a056000078300b0022863395912sm17227486wrb.53.2022.09.08.03.43.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Sep 2022 03:43:58 -0700 (PDT) From: Lukas Bulwahn To: Russell King , linux-arm-kernel@lists.infradead.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Mauro Carvalho Chehab , linux-media@vger.kernel.org, Peter Chen , Greg Kroah-Hartman , linux-usb@vger.kernel.org, Andrew Morton , Mike Rapoport , linux-mm@kvack.org, Masahiro Yamada , linux-kbuild@vger.kernel.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 6/6] init/Kconfig: remove confusing config EMBEDDED Date: Thu, 8 Sep 2022 12:43:37 +0200 Message-Id: <20220908104337.11940-7-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220908104337.11940-1-lukas.bulwahn@gmail.com> References: <20220908104337.11940-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Commit 6a108a14fa35 ("kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT") introduces CONFIG_EXPERT to carry the previous intent of CONFIG_EMBEDDED and just gives that intent a much better name. That has been clearly a good and long overdue renaming, and it is clearly an improvement to the kernel build configuration that has shown to help managing the kernel build configuration in the last decade. However, rather than bravely and radically just deleting CONFIG_EMBEDDED, this commit gives CONFIG_EMBEDDED a new intended semantics, but keeps it open for future contributors to implement that intended semantics: A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Since then, this CONFIG_EMBEDDED implicitly had two purposes: - It can make even more options visible beyond what CONFIG_EXPERT makes visible. In other words, it may introduce another level of enabling the visibility of configuration options: always visible, visible with CONFIG_EXPERT and visible with CONFIG_EMBEDDED. - Set certain default values of some configurations differently, following the assumption that configuring a kernel build for an embedded system generally starts with a different set of default values compared to kernel builds for all other kind of systems. Considering the first purpose, at the point in time where CONFIG_EMBEDDED was renamed to CONFIG_EXPERT, CONFIG_EXPERT already made 130 more options become visible throughout all different menus for the kernel configuration. Over the last decade, this has gradually increased, so that currently, with CONFIG_EXPERT, roughly 170 more options become visible throughout all different menus for the kernel configuration. In comparison, currently with CONFIG_EMBEDDED enabled, just seven more options are visible, one in x86, one in arm, and five for the ChipIdea Highspeed Dual Role Controller. As the numbers suggest, these two levels of enabling the visibility of even more configuration options---beyond what CONFIG_EXPERT enables---never evolved to a good solution in the last decade. In other words, this additional level of visibility of configuration option with CONFIG_EMBEDDED compared to CONFIG_EXPERT has since its introduction never become really valuable. It requires quite some investigation to actually understand what is additionally visible and it does not differ significantly in complexity compared to just enabling CONFIG_EXPERT. This CONFIG_EMBEDDED---or any other config to show more detailed options beyond CONFIG_EXPERT---is unlikely to be valuable unless somebody puts significant effort in identifying how such visibility options can be properly split and creating clear criteria, when some config option is visible with CONFIG_EXPERT and when some config option is visible only with some further option enabled beyond CONFIG_EXPERT, such as CONFIG_EMBEDDED attempted to do. For now, it is much more reasonable to simply make those additional seven options that visible with CONFIG_EMBEDDED, visible with CONFIG_EXPERT, and then remove CONFIG_EMBEDDED. If anyone spends significant effort in structuring the visibility of config options, they may re-introduce suitable new config options simply as they see fit. Hence, all uses of CONFIG_EMBEDDED have been replaced with CONFIG_EXPERT. Considering the second purpose, note that already probably arguing that a kernel build for an embedded system would choose some values differently is already tricky: the set of embedded systems with Linux kernels is already quite diverse. Many embedded system have powerful CPUs and it would not be clear that all embedded systems just optimize towards one specific aspect, e.g., a smaller kernel image size. So, it is unclear if starting with "one set of default configuration" that is induced by CONFIG_EMBEDDED is a good offer for developers configuring their kernels. Also, the differences of needed user-space features in an embedded system compared to a non-embedded system are probably difficult or even impossible to name in some generic way. So it is not surprising that in the last decade hardly anyone has contributed changes to make something default differently in case of CONFIG_EMBEDDED=y. In v6.0-rc4, SECRETMEM is the only config switched off if CONFIG_EMBEDDED=y. That one use was removed as well, SECRETMEM was made configurable at build time by experts using menuconfig instead. As there are no further uses of CONFIG_EMBEDDED and CONFIG_EMBEDDED never lived up to its intended purpose defined above, simply delete this confusing CONFIG_EMBEDDED. Signed-off-by: Lukas Bulwahn Reviewed-by: Masahiro Yamada --- init/Kconfig | 8 -------- 1 file changed, 8 deletions(-) diff --git a/init/Kconfig b/init/Kconfig index 9e3fd79b089c..d7429e0b8cae 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1818,14 +1818,6 @@ config DEBUG_RSEQ If unsure, say N. -config EMBEDDED - bool "Embedded system" - select EXPERT - help - This option should be enabled if compiling the kernel for - an embedded system so certain expert options are available - for configuration. - config HAVE_PERF_EVENTS bool help