From nobody Thu Oct 2 02:13:28 2025 Received: from fra-out-002.esa.eu-central-1.outbound.mail-perimeter.amazon.com (fra-out-002.esa.eu-central-1.outbound.mail-perimeter.amazon.com [3.65.3.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4D12A2253FF; Mon, 29 Sep 2025 18:35:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=3.65.3.180 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759170949; cv=none; b=kZExx8CJJ6t2F7Aw+gZpxPIWFkZBYQzkQ4zS1KY7k9EfIA6fVpjowQAi6tJJeIxJUtAm+7cLn4DKF9MdntR2Y5/+VApUtQPyqIuE32WR0ZezWpsjbQHJEuCNzIqZxDis1iTFQFkDCVukpqvgxMwTsj5FNvwa9M4N6vOr1Bg5lpY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759170949; c=relaxed/simple; bh=M+DzBGorF0x2HwKxbRALu5Mz4okNvOwcKTlN8glrxuQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=YOZ7J76W38Ajfj8NvZvPMMk1Udh2L0CacnL8Uo7xWVC/aFUHYXOF0azNzjm+IBQ8G/xPWEVUY7awzSlKpjOOaLcDpz8+WFyJ4152JeThvq9vzDq+OjTXtD7SiJPK2CqkkwHFJ9XCFYOS1lsSJDgrBlQLc2YkFMdhWxp5N3KgByM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com; spf=pass smtp.mailfrom=amazon.com; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b=Etq9wgS1; arc=none smtp.client-ip=3.65.3.180 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=amazon.com header.i=@amazon.com header.b="Etq9wgS1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1759170947; x=1790706947; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8djAgabF22BDsxfYcNFa72Q6mXnC3doUyHk+thXHzBc=; b=Etq9wgS1p6zacK/4tAqD4tWF/dN+j7buruW2Z5T3Q1PWTU7wpY6uBQaB 9PVv6sYm/45whvWIvjPjxLCPg1yinFqBczKFxV2tqT17lx+L9y1WicZyl DxW7srynr1e3UafiwiGIOmWfvUKAdbpnzYPJBdJppPc1afwqtXJCTMhri tqIAHHW+9ZrLjLpW3NXDySZzLNoEOeg8nJ9IhGtXYkUwTLP8CfLg5pR4P e2NS0Uuivhp6PPL1BPG7GPqNeLG/O0zcp0p94GwXycHT77zUenYvGvYVn qd9/pUbdMSkd/9Eifon5smEkl+DpsNAjPpB7aX6DHJX5DP5FL65Oa7DPB g==; X-CSE-ConnectionGUID: 4IyTdLw4QGmcYdemLDK8Ww== X-CSE-MsgGUID: JX6FatBWTRSdo1yNhtNGBg== X-IronPort-AV: E=Sophos;i="6.18,302,1751241600"; d="scan'208";a="2849708" Received: from ip-10-6-3-216.eu-central-1.compute.internal (HELO smtpout.naws.eu-central-1.prod.farcaster.email.amazon.dev) ([10.6.3.216]) by internal-fra-out-002.esa.eu-central-1.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2025 18:35:45 +0000 Received: from EX19MTAEUA001.ant.amazon.com [54.240.197.233:12135] by smtpin.naws.eu-central-1.prod.farcaster.email.amazon.dev [10.0.33.147:2525] with esmtp (Farcaster) id a0c43d30-c496-443a-bc27-4253e2a8681f; Mon, 29 Sep 2025 18:35:45 +0000 (UTC) X-Farcaster-Flow-ID: a0c43d30-c496-443a-bc27-4253e2a8681f Received: from EX19D018EUA004.ant.amazon.com (10.252.50.85) by EX19MTAEUA001.ant.amazon.com (10.252.50.192) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Mon, 29 Sep 2025 18:35:45 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (172.19.116.181) by EX19D018EUA004.ant.amazon.com (10.252.50.85) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Mon, 29 Sep 2025 18:35:39 +0000 From: Eliav Farber To: , , , , , , , , CC: Andy Shevchenko , Christoph Hellwig , Dan Carpenter , "Jason A. Donenfeld" , Jens Axboe , Lorenzo Stoakes , Mateusz Guzik , "Matthew Wilcox" , Pedro Falcato Subject: [PATCH v2 12/13 6.1.y] minmax.h: simplify the variants of clamp() Date: Mon, 29 Sep 2025 18:33:57 +0000 Message-ID: <20250929183358.18982-13-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250929183358.18982-1-farbere@amazon.com> References: <20250929183358.18982-1-farbere@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: EX19D043UWA002.ant.amazon.com (10.13.139.53) To EX19D018EUA004.ant.amazon.com (10.252.50.85) Content-Type: text/plain; charset="utf-8" From: David Laight [ Upstream commit 495bba17cdf95e9703af1b8ef773c55ef0dfe703 ] Always pass a 'type' through to __clamp_once(), pass '__auto_type' from clamp() itself. The expansion of __types_ok3() is reasonable so it isn't worth the added complexity of avoiding it when a fixed type is used for all three values. Link: https://lkml.kernel.org/r/8f69f4deac014f558bab186444bac2e8@AcuMS.acul= ab.com Signed-off-by: David Laight Cc: Andy Shevchenko Cc: Arnd Bergmann Cc: Christoph Hellwig Cc: Dan Carpenter Cc: Jason A. Donenfeld Cc: Jens Axboe Cc: Lorenzo Stoakes Cc: Mateusz Guzik Cc: Matthew Wilcox Cc: Pedro Falcato Signed-off-by: Andrew Morton Signed-off-by: Eliav Farber --- include/linux/minmax.h | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/include/linux/minmax.h b/include/linux/minmax.h index 75fb7a6ad4c6..2bbdd5b5e07e 100644 --- a/include/linux/minmax.h +++ b/include/linux/minmax.h @@ -183,29 +183,29 @@ #define __clamp(val, lo, hi) \ ((val) >=3D (hi) ? (hi) : ((val) <=3D (lo) ? (lo) : (val))) =20 -#define __clamp_once(val, lo, hi, uval, ulo, uhi) ({ \ - __auto_type uval =3D (val); \ - __auto_type ulo =3D (lo); \ - __auto_type uhi =3D (hi); \ +#define __clamp_once(type, val, lo, hi, uval, ulo, uhi) ({ \ + type uval =3D (val); \ + type ulo =3D (lo); \ + type uhi =3D (hi); \ BUILD_BUG_ON_MSG(statically_true(ulo > uhi), \ "clamp() low limit " #lo " greater than high limit " #hi); \ BUILD_BUG_ON_MSG(!__types_ok3(uval, ulo, uhi), \ "clamp("#val", "#lo", "#hi") signedness error"); \ __clamp(uval, ulo, uhi); }) =20 -#define __careful_clamp(val, lo, hi) \ - __clamp_once(val, lo, hi, __UNIQUE_ID(v_), __UNIQUE_ID(l_), __UNIQUE_ID(h= _)) +#define __careful_clamp(type, val, lo, hi) \ + __clamp_once(type, val, lo, hi, __UNIQUE_ID(v_), __UNIQUE_ID(l_), __UNIQU= E_ID(h_)) =20 /** - * clamp - return a value clamped to a given range with strict typechecking + * clamp - return a value clamped to a given range with typechecking * @val: current value * @lo: lowest allowable value * @hi: highest allowable value * - * This macro does strict typechecking of @lo/@hi to make sure they are of= the - * same type as @val. See the unnecessary pointer comparisons. + * This macro checks @val/@lo/@hi to make sure they have compatible + * signedness. */ -#define clamp(val, lo, hi) __careful_clamp(val, lo, hi) +#define clamp(val, lo, hi) __careful_clamp(__auto_type, val, lo, hi) =20 /** * clamp_t - return a value clamped to a given range using a given type @@ -217,7 +217,7 @@ * This macro does no typechecking and uses temporary variables of type * @type to make all the comparisons. */ -#define clamp_t(type, val, lo, hi) __careful_clamp((type)(val), (type)(lo)= , (type)(hi)) +#define clamp_t(type, val, lo, hi) __careful_clamp(type, val, lo, hi) =20 /** * clamp_val - return a value clamped to a given range using val's type @@ -230,7 +230,7 @@ * type and @lo and @hi are literals that will otherwise be assigned a sig= ned * integer type. */ -#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) +#define clamp_val(val, lo, hi) __careful_clamp(typeof(val), val, lo, hi) =20 /* * Do not check the array parameter using __must_be_array(). --=20 2.47.3