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[23.128.96.36]) by mx.google.com with ESMTPS id h20-20020a056a001a5400b006b1fec25a82si2660031pfv.403.2023.10.28.12.06.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Oct 2023 12:06:06 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) client-ip=23.128.96.36; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=m6ryLtQS; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by pete.vger.email (Postfix) with ESMTP id 8A9E6805DC66; Sat, 28 Oct 2023 12:06:04 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at pete.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229452AbjJ1TFi (ORCPT + 28 others); Sat, 28 Oct 2023 15:05:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229446AbjJ1TFh (ORCPT ); Sat, 28 Oct 2023 15:05:37 -0400 Received: from mail-yw1-x1136.google.com (mail-yw1-x1136.google.com [IPv6:2607:f8b0:4864:20::1136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31B05EB for ; Sat, 28 Oct 2023 12:05:35 -0700 (PDT) Received: by mail-yw1-x1136.google.com with SMTP id 00721157ae682-5a8ee23f043so25966307b3.3 for ; Sat, 28 Oct 2023 12:05:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698519934; x=1699124734; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=wWIdgRFmHPKvDHRv6SpMLld7lnUsj3xAHGK/xCXy82A=; b=m6ryLtQSiXg4dSbnpR7neKmb4+uTyzLGwooeb3LGKbTBDDIlcHvN+QpvUMJrwxEJm1 qRlpOGKW/q70FUuISvesyHjpZ5VPcog/D5xETIIZ/xRrD63WkKvgUiGsxY5T27bIfh30 BxRgA97tstbxJIkbdlz+sM9QbVRv2tGuz4T9+FPhP2LvcXVHYvQ37OVuOZItqJaHQbic BgVfsu7uhPHSXi5UT2k+HiKJr85kN+QP4NM6+0+TiIaXoQzrt4HpHxnt5/ZtSjgv1qc4 3TJ7am0L4w4bOnF8PvsnVF+JOjRC+2qzbk+ixC+CxB7NfRvhMcgwXr9F/Gp4xd2xAeMC RRBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698519934; x=1699124734; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=wWIdgRFmHPKvDHRv6SpMLld7lnUsj3xAHGK/xCXy82A=; b=h01xQx8wl0SmGUkevjjX4CGTkkcgnk7PbzPiAdASk+zW0UPpu7L+1RnQm60iGboyxD 87ycVPy9O8BOrx3iy8NDl4FVlT30ytWAe9IFyIBApavlEn8jEH4euYTclvpeJR8VmWLt WvDxwr23ZD4HJG+hlpD4QWjh8unA5emRfXnsMqZ/RZQihrfOpCn3EVWyQakp6NI4qAN2 0MabE1fu/5OQPkBElpgWu1ETwzoS63Ab45K2q+ZuydTIB6PI4HBm+AhBxNednbjmtWZk YH2J7XBa6Wnfk8ZkN4vnQ3crjuK/LKUzqYhIQPEG20M6kszOR8VJ3OsWRN2RvGHak2aU J8ww== X-Gm-Message-State: AOJu0Yy+IGQ+53b/uG2GZBP1N7OVR3kjQPuznlYrIFy6W9xi3bkkIajq uR5hQJC8Io6BkG9ZZEBfh/U5Xw3k+LxX3Q== X-Received: by 2002:a81:e405:0:b0:5a7:aa65:c536 with SMTP id r5-20020a81e405000000b005a7aa65c536mr5224947ywl.0.1698519933977; Sat, 28 Oct 2023 12:05:33 -0700 (PDT) Received: from localhost ([50.221.102.30]) by smtp.gmail.com with ESMTPSA id o15-20020a81de4f000000b005add997ae53sm2119688ywl.81.2023.10.28.12.05.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Oct 2023 12:05:33 -0700 (PDT) From: Yury Norov To: linux-kernel@vger.kernel.org Cc: Yury Norov , Andy Shevchenko , Rasmus Villemoes Subject: [PATCH] lib/find: optimize find_*_bit_wrap Date: Sat, 28 Oct 2023 12:05:29 -0700 Message-Id: <20231028190530.286300-1-yury.norov@gmail.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Sat, 28 Oct 2023 12:06:04 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781027272527545293 X-GMAIL-MSGID: 1781027272527545293 When an offset is 0, there's no need to search a bitmap from the beginning after the 1st search failed, because each bit has already been tested. Signed-off-by: Yury Norov --- include/linux/find.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/find.h b/include/linux/find.h index 5e4f39ef2e72..241b6d028eda 100644 --- a/include/linux/find.h +++ b/include/linux/find.h @@ -405,7 +405,7 @@ unsigned long find_next_and_bit_wrap(const unsigned long *addr1, { unsigned long bit = find_next_and_bit(addr1, addr2, size, offset); - if (bit < size) + if (bit < size || offset == 0) return bit; bit = find_first_and_bit(addr1, addr2, offset); @@ -427,7 +427,7 @@ unsigned long find_next_bit_wrap(const unsigned long *addr, { unsigned long bit = find_next_bit(addr, size, offset); - if (bit < size) + if (bit < size || offset == 0) return bit; bit = find_first_bit(addr, offset);