From patchwork Sat Aug 14 21:17:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 12436901 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 CD180C43214 for ; Sat, 14 Aug 2021 21:18:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2B3160EE2 for ; Sat, 14 Aug 2021 21:18:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233486AbhHNVSj (ORCPT ); Sat, 14 Aug 2021 17:18:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233890AbhHNVSV (ORCPT ); Sat, 14 Aug 2021 17:18:21 -0400 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08D7DC0613A3; Sat, 14 Aug 2021 14:17:52 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id u21-20020a17090a8915b02901782c36f543so26166487pjn.4; Sat, 14 Aug 2021 14:17:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=za+zWNJDU/3F0ZiEfFZ8ek3a7aWT/E1uFDJjU1HEbfc=; b=Em2OdIePOUYTYSsf2rAAY+I+24KTdEd/bl8Yc69dRglboswkDh4J3PbE7OMyEvjPGz uPCMDYN0EMHgmZHctr+o88JA4Ty1rKivAtLtir6MO1vWC9d3VgtEs0ngl3dyqdCQQCDI x3/USZ9Mry20Tj1EMiFTk8Dw63Ds7Q39f124M7WqjojCxBNImorH1wyfN6bJ4ZfdgZzg 2EhPk7BKfUveDRWJK0rruSRMbhEG4CnBu430ws8PFH8P7F6TNxrUSi3lpIarYc4rgME3 cyGRU4rYHQ78PGzwMWaL5RRReSJCfokQPzZr7zS0lFr0Or5LIPi1IUYwxqWrCWchaBc7 Hwow== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=za+zWNJDU/3F0ZiEfFZ8ek3a7aWT/E1uFDJjU1HEbfc=; b=sV4WM3f+K55xNSzEhBNRctYvq5L+D3F7SjiOq7xVAxwTRWqaf6s5XRPAj1T9ePKrmL ntZwhym1qqydj7i5O3O4ZQMjCy9gvhbGKIAxqIfqVlwZ3eJQ0tlyGlsnvOEZl9TciRuN JeJQbnAThf3db9q79SAZdw/829RCNKjou72j0Jof5silb3oP9nU6RKOarmv6YptgX3r6 106jhHxEQ1uWWKiC0sB4ghjn3Ep47cZ/4uQjb2Y3A8RwlqMT5WjDsAYls0VZDBopqA6p qRCCfau+BtGO4yizhi8U14FIXu/wPrxRY6mNBgnmM/yVhXy4VnZYBs4NLNu8ySgwldK8 mNzA== X-Gm-Message-State: AOAM530v9d66ETu8AUna0wGcG7pF4sOCwf2U1k4dauy51WOdhzFYQF8N 99iPGyMHwCFJ3nNVVWaskwE= X-Google-Smtp-Source: ABdhPJxQZ9uTw/UwZstpMfHvv66bKP7iRO13IDSl+JxB6n9JLGqhrX5SU3PEKCUyAISjyxGlLasm4A== X-Received: by 2002:a05:6a00:a94:b029:384:1dc6:7012 with SMTP id b20-20020a056a000a94b02903841dc67012mr8493709pfl.53.1628975871491; Sat, 14 Aug 2021 14:17:51 -0700 (PDT) Received: from localhost ([12.28.44.171]) by smtp.gmail.com with ESMTPSA id l126sm7733007pgl.14.2021.08.14.14.17.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Aug 2021 14:17:51 -0700 (PDT) From: Yury Norov To: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mmc@vger.kernel.org, linux-perf-users@vger.kernel.org, kvm@vger.kernel.org, "James E.J. Bottomley" , Alexander Lobakin , Alexander Shishkin , Alexey Klimov , Andrea Merello , Andy Shevchenko , Arnaldo Carvalho de Melo , Arnd Bergmann , Ben Gardon , Benjamin Herrenschmidt , Brian Cain , Catalin Marinas , Christoph Lameter , Daniel Bristot de Oliveira , David Hildenbrand , Dennis Zhou , Geert Uytterhoeven , Heiko Carstens , Ian Rogers , Ingo Molnar , Jaegeuk Kim , Jakub Kicinski , Jiri Olsa , Joe Perches , Jonas Bonn , Leo Yan , Mark Rutland , Namhyung Kim , Palmer Dabbelt , Paolo Bonzini , Peter Xu , Peter Zijlstra , Petr Mladek , Rasmus Villemoes , Rich Felker , Samuel Mendoza-Jonas , Sean Christopherson , Sergey Senozhatsky , Shuah Khan , Stefan Kristiansson , Steven Rostedt , Tejun Heo , Thomas Bogendoerfer , Ulf Hansson , Will Deacon , Wolfram Sang , Yoshinori Sato , Yury Norov Subject: [PATCH 04/17] arch: remove GENERIC_FIND_FIRST_BIT entirely Date: Sat, 14 Aug 2021 14:17:00 -0700 Message-Id: <20210814211713.180533-5-yury.norov@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210814211713.180533-1-yury.norov@gmail.com> References: <20210814211713.180533-1-yury.norov@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In 5.12 cycle we enabled GENERIC_FIND_FIRST_BIT config option for ARM64 and MIPS. It increased performance and shrunk .text size; and so far I didn't receive any negative feedback on the change. https://lore.kernel.org/linux-arch/20210225135700.1381396-1-yury.norov@gmail.com/ Now I think it's a good time to switch all architectures to use find_{first,last}_bit() unconditionally, and so remove corresponding config option. The patch does't introduce functioal changes for arc, arm, arm64, mips, m68k, s390 and x86, for other architectures I expect improvement both in performance and .text size. Signed-off-by: Yury Norov Tested-by: Alexander Lobakin (mips) Reviewed-by: Alexander Lobakin (mips) Reviewed-by: Andy Shevchenko Acked-by: Will Deacon Tested-by: Wolfram Sang --- arch/arc/Kconfig | 1 - arch/arm64/Kconfig | 1 - arch/mips/Kconfig | 1 - arch/s390/Kconfig | 1 - arch/x86/Kconfig | 1 - arch/x86/um/Kconfig | 1 - include/linux/find.h | 13 ------------- lib/Kconfig | 3 --- 8 files changed, 22 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 53d143fc42fe..f35994edc165 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -20,7 +20,6 @@ config ARC select COMMON_CLK select DMA_DIRECT_REMAP select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC) - select GENERIC_FIND_FIRST_BIT # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index fdcd54d39c1e..7b2269ad3e12 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -119,7 +119,6 @@ config ARM64 select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_VULNERABILITIES select GENERIC_EARLY_IOREMAP - select GENERIC_FIND_FIRST_BIT select GENERIC_IDLE_POLL_SETUP select GENERIC_IRQ_IPI select GENERIC_IRQ_PROBE diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index da874375fa4b..d7758c8f7e37 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -30,7 +30,6 @@ config MIPS select GENERIC_ATOMIC64 if !64BIT select GENERIC_CMOS_UPDATE select GENERIC_CPU_AUTOPROBE - select GENERIC_FIND_FIRST_BIT select GENERIC_GETTIMEOFDAY select GENERIC_IOMAP select GENERIC_IRQ_PROBE diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 92c0a1b4c528..7a3bbaf19640 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -126,7 +126,6 @@ config S390 select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_VULNERABILITIES select GENERIC_ENTRY - select GENERIC_FIND_FIRST_BIT select GENERIC_GETTIMEOFDAY select GENERIC_PTDUMP select GENERIC_SMP_IDLE_THREAD diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 45962aaf2b2c..7edce30dc214 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -134,7 +134,6 @@ config X86 select GENERIC_CPU_VULNERABILITIES select GENERIC_EARLY_IOREMAP select GENERIC_ENTRY - select GENERIC_FIND_FIRST_BIT select GENERIC_IOMAP select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP select GENERIC_IRQ_MATRIX_ALLOCATOR if X86_LOCAL_APIC diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig index 95d26a69088b..40d6a06e41c8 100644 --- a/arch/x86/um/Kconfig +++ b/arch/x86/um/Kconfig @@ -8,7 +8,6 @@ endmenu config UML_X86 def_bool y - select GENERIC_FIND_FIRST_BIT config 64BIT bool "64-bit kernel" if "$(SUBARCH)" = "x86" diff --git a/include/linux/find.h b/include/linux/find.h index c5410c243e04..ea57f7f38c49 100644 --- a/include/linux/find.h +++ b/include/linux/find.h @@ -101,8 +101,6 @@ unsigned long find_next_zero_bit(const unsigned long *addr, unsigned long size, } #endif -#ifdef CONFIG_GENERIC_FIND_FIRST_BIT - #ifndef find_first_bit /** * find_first_bit - find the first set bit in a memory region @@ -147,17 +145,6 @@ unsigned long find_first_zero_bit(const unsigned long *addr, unsigned long size) } #endif -#else /* CONFIG_GENERIC_FIND_FIRST_BIT */ - -#ifndef find_first_bit -#define find_first_bit(addr, size) find_next_bit((addr), (size), 0) -#endif -#ifndef find_first_zero_bit -#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0) -#endif - -#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ - #ifndef find_last_bit /** * find_last_bit - find the last set bit in a memory region diff --git a/lib/Kconfig b/lib/Kconfig index 5c9c0687f76d..f8874240835b 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -59,9 +59,6 @@ config GENERIC_STRNLEN_USER config GENERIC_NET_UTILS bool -config GENERIC_FIND_FIRST_BIT - bool - source "lib/math/Kconfig" config NO_GENERIC_PCI_IOPORT_MAP