From nobody Tue Dec 16 13:48:42 2025 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 2E56FC4167B for ; Sat, 28 Oct 2023 19:07:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229594AbjJ1TFi (ORCPT ); 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-Google-Smtp-Source: AGHT+IHrYkEcI4lGnNKczgd7jKmjBl2FENry571J4NDiGCSS0z55WXV4VxfuaBzMq1fTTjksiMQJyw== 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 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 lon= g *addr1, { unsigned long bit =3D find_next_and_bit(addr1, addr2, size, offset); =20 - if (bit < size) + if (bit < size || offset =3D=3D 0) return bit; =20 bit =3D find_first_and_bit(addr1, addr2, offset); @@ -427,7 +427,7 @@ unsigned long find_next_bit_wrap(const unsigned long *a= ddr, { unsigned long bit =3D find_next_bit(addr, size, offset); =20 - if (bit < size) + if (bit < size || offset =3D=3D 0) return bit; =20 bit =3D find_first_bit(addr, offset); --=20 2.39.2