From patchwork Tue Oct 5 05:40:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Norov X-Patchwork-Id: 12535541 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C94FDC433FE for ; Tue, 5 Oct 2021 05:41:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6576B60F5D for ; Tue, 5 Oct 2021 05:41:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6576B60F5D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 0A8FD6B0074; Tue, 5 Oct 2021 01:41:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 07EFA900002; Tue, 5 Oct 2021 01:41:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E62A96B0078; Tue, 5 Oct 2021 01:41:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0133.hostedemail.com [216.40.44.133]) by kanga.kvack.org (Postfix) with ESMTP id D84D06B0074 for ; Tue, 5 Oct 2021 01:41:10 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 9FCDC181B3E98 for ; Tue, 5 Oct 2021 05:41:10 +0000 (UTC) X-FDA: 78661285500.05.5863B06 Received: from mail-pj1-f48.google.com (mail-pj1-f48.google.com [209.85.216.48]) by imf03.hostedemail.com (Postfix) with ESMTP id 63445300022C for ; Tue, 5 Oct 2021 05:41:10 +0000 (UTC) Received: by mail-pj1-f48.google.com with SMTP id ls18so3108563pjb.3 for ; Mon, 04 Oct 2021 22:41:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=/+gtm0FLiMCt+Nb3OshbuVKuaLsIbndL4E6g0IJn8HQ=; b=L8xA9w4w8Rd7cNvQadVMnTrZvaZFgxRq7dW6P1GadvxJGr/nfOKQTf9ec/x8hzjuZm 5Y4hRjmqlq9CQn/t0FKiap8tey2OfdEKflaN50VfBolwx/xZDgWNyqCsDGxmqYa0HLRo APx4sQzVHNf0/of3cwjbHfOSJW6XqLKYW9CZJDCvMcUCiY0B5YxJG+FwJ1a2R0K3NR11 JqLzhCXpv+HqluHVJ09H52c2JD3WAbRqfoSDUHWXLmUcunTA/GaKa3t6ch9FL1uZxwzC 5vOmyW0i0EYnkJV8h103u1aEsJf7bdZkkVcaHemEuBmaA3oTa/SBNUrKrWqrHB7/kXgC fqQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=/+gtm0FLiMCt+Nb3OshbuVKuaLsIbndL4E6g0IJn8HQ=; b=rnezE58sQuXrItJHYKYp9SVHaguByFNsxxE+xMpmt+Si9wylMmY9NuTLZR3vi/ZaRH kKdOAXMdPAk16Znm0ZNKHI0OfwgrJE6AKFOp8JvxV3MlU0eVFCVv26LzIOpnEkfUl6aj sWxCLGKIqpA5o3mXrZiYybPbBNRW+kZXTuo5Q8NB18TdRCHR6Ib1rkNfHR+ITvpLvsJh zEkpHmUSx0O5S1BGyoyZ7hMV4wt/dyM4NPEA6WIBALOrB+js9tGN5QxPyaBx/2k8qtul ca9TA+fM+kddqywtmB4YrCgLRnGuYjEWOsC0+WEnmWLZeM4CRW25F3k2DY0QhiSXYXd6 UIEQ== X-Gm-Message-State: AOAM531L6MCr9H2jFU+P9maA2jFbpjU4VeVo1TKZqxiH6YBP8EtI2fDL o87T58f0f8CTrYzj+sr1hGM= X-Google-Smtp-Source: ABdhPJxvGk07vscajxuvSw6VrQ8+TooSl11ye1kjtzPBe1RxEq/KwMNNWd+616JmBDxJHW3IuMqN8A== X-Received: by 2002:a17:902:a702:b029:12b:aa0f:d553 with SMTP id w2-20020a170902a702b029012baa0fd553mr3492706plq.3.1633412469416; Mon, 04 Oct 2021 22:41:09 -0700 (PDT) Received: from localhost (searspoint.nvidia.com. [216.228.112.21]) by smtp.gmail.com with ESMTPSA id e22sm15695744pfn.101.2021.10.04.22.41.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 04 Oct 2021 22:41:09 -0700 (PDT) From: Yury Norov To: Stephen Rothwell Cc: Yury Norov , 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 Subject: [PATCH 04/16] arch: remove GENERIC_FIND_FIRST_BIT entirely Date: Mon, 4 Oct 2021 22:40:47 -0700 Message-Id: <20211005054059.475634-5-yury.norov@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211005054059.475634-1-yury.norov@gmail.com> References: <20211005054059.475634-1-yury.norov@gmail.com> MIME-Version: 1.0 Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=L8xA9w4w; spf=pass (imf03.hostedemail.com: domain of yury.norov@gmail.com designates 209.85.216.48 as permitted sender) smtp.mailfrom=yury.norov@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 63445300022C X-Stat-Signature: i4qx7hi14w6uiuaqkenfihcyfg74soth X-HE-Tag: 1633412470-401238 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 3a5a80f302e1..248389278e8f 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 5c7ae4c3954b..abbd7b1e549f 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 771ca53af06d..0cf31a6cbee1 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -32,7 +32,6 @@ 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 b86de61b8caa..b0bb3aaec5f2 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -127,7 +127,6 @@ 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 ab83c22d274e..8a2c61f732ee 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 5e7165e6a346..6a6ae5312fa0 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -65,9 +65,6 @@ 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