From nobody Thu Oct 2 09:19:22 2025 Received: from fra-out-013.esa.eu-central-1.outbound.mail-perimeter.amazon.com (fra-out-013.esa.eu-central-1.outbound.mail-perimeter.amazon.com [63.178.132.221]) (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 7F4A3308F0A; Fri, 19 Sep 2025 10:33:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=63.178.132.221 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758277985; cv=none; b=V0W57dZpwLBXZ5KmUihcvKdjrIa1IUjxLZgDuzObBlihpirkZWDpDL0E7tMIzyqk2rOP7yy+/5TqOupcKmUaDk1yJ95fAUvcUlSZS1gkf1A0pkctLcu6LmPLKm9YgtasB1OZGAyjVuT5MiFbaOYqveUKgRaIXfnOgWvqo5+Hycs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758277985; c=relaxed/simple; bh=M+DzBGorF0x2HwKxbRALu5Mz4okNvOwcKTlN8glrxuQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=amk+0nDCPv3cGcI1Nc2n5OFLLnVBi9SiycAVHbr4hd4w8z+xJJz4m1XSOex3nGAolS7gN7/I4JBHe/w5tdnEtblmG66u6MiiPymij673gJfRTHDybxR+e630bXI+zxIvHLIsJ1niws4TZJiRh3uLnDU8waf4xvifBimCstxj/9E= 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=kYvXyPiB; arc=none smtp.client-ip=63.178.132.221 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="kYvXyPiB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1758277983; x=1789813983; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8djAgabF22BDsxfYcNFa72Q6mXnC3doUyHk+thXHzBc=; b=kYvXyPiB23lg3YIxsVOog0bbHXdcMpJ3wr9riknxV4UeSbGNTuZ9QRXj q9Onrsu8Xg15QzFWnVIRYsZJerHajj+de2xpHWMrpOmTUoe+UI0PmgvM2 3iFljmTq63j7n5T85nwhwlXJwP1eHNIkTiUQfnXQZVAe/xcBIXmpwE/GX XKzWT9tqrv3ptDOsXCWtKo+iyak+SbbS4GrJRXlS5FxkY1WNGdJeGVwxX P2du/p3i5QzMUMWqncoB9ATYWitof92c3ywQakPiIaHdpk4EoLDbdPmfC RytptXasQsYtGtY8TKaJdbU8XpESmeT7KaDl3XboergsKcnLXOple/RBX w==; X-CSE-ConnectionGUID: UW5gnmkdQTiXSYEIfmGLQQ== X-CSE-MsgGUID: g8u952lXQ0CQOdRubqmsLw== X-IronPort-AV: E=Sophos;i="6.18,277,1751241600"; d="scan'208";a="2264951" Received: from ip-10-6-6-97.eu-central-1.compute.internal (HELO smtpout.naws.eu-central-1.prod.farcaster.email.amazon.dev) ([10.6.6.97]) by internal-fra-out-013.esa.eu-central-1.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Sep 2025 10:33:00 +0000 Received: from EX19MTAEUA002.ant.amazon.com [54.240.197.232:19477] by smtpin.naws.eu-central-1.prod.farcaster.email.amazon.dev [10.0.8.212:2525] with esmtp (Farcaster) id 3cacb80e-2d3f-4963-bb11-96fbee5fabe1; Fri, 19 Sep 2025 10:33:00 +0000 (UTC) X-Farcaster-Flow-ID: 3cacb80e-2d3f-4963-bb11-96fbee5fabe1 Received: from EX19D018EUA004.ant.amazon.com (10.252.50.85) by EX19MTAEUA002.ant.amazon.com (10.252.50.126) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Fri, 19 Sep 2025 10:32:59 +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; Fri, 19 Sep 2025 10:32:30 +0000 From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , Arnd Bergmann , Christoph Hellwig , Dan Carpenter , Jens Axboe , Lorenzo Stoakes , "Mateusz Guzik" , Pedro Falcato Subject: [PATCH 26/27 5.10.y] minmax.h: simplify the variants of clamp() Date: Fri, 19 Sep 2025 10:17:26 +0000 Message-ID: <20250919101727.16152-27-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250919101727.16152-1-farbere@amazon.com> References: <20250919101727.16152-1-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: EX19D038UWC002.ant.amazon.com (10.13.139.238) 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