From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pdx-out-012.esa.us-west-2.outbound.mail-perimeter.amazon.com (pdx-out-012.esa.us-west-2.outbound.mail-perimeter.amazon.com [35.162.73.231]) (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 B3F252F9D9D; Wed, 8 Oct 2025 15:31:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=35.162.73.231 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759937518; cv=none; b=qALT21eUs4hIUymo7O2sg+TidnZqSTtyo54WtTurxhNmnJmdIahQD9w5O68YwOojDt6HH9ijoWh6AhVZJAW3cgtHsF96FsrwFivZoxgjFAAQ6iZXC2Rbv7e3sV4Sp2cyHu1Zr5sCy2a7OWVNFdvHgQN1gKcSWiK86ydjxxHHVS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759937518; c=relaxed/simple; bh=UF5HInXqvuEZDjvLFk9TJPIURvGdbWuJMNhMd8v9A0E=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Mi1czipFZjKW/n6ijO804Cd5f8g1vQ0fUYu42dvVVoCPEpnd4QK5hg4zKvr4qNDxjcrW9yeGh9CAt74O1Cz/VfelA16b42VTRlHwDXO0dnrt5zHuEct0v+TJBfBHpfstgPFCSkuFNyPR+esw01lHg/xRHiSFJUwiQPPeo9xhQrI= 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=YM77ENWn; arc=none smtp.client-ip=35.162.73.231 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="YM77ENWn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazoncorp2; t=1759937515; x=1791473515; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=nWSej8xbBt1No+Mk4Q7cDNVqN1sPbiSh6ZSRtMK8qI8=; b=YM77ENWnKfoG3QX7e9n9+Ki9AiEHUe7mT5zoHc5FTsToRLAZTP3oDMkD F6sZl8yAXFE1U4hQTFzq185+LfLR1mFe3XnOBFdOfyL9nYTMfOqPPGo8k ON4rk/hO776Io/yMqIOUefCiVYNsmVFcbSsQj/JeOUruX80vjfBM8p4aV zWFi52Y3SHak/JGh5n5SuA2X3j18/OielQX1JyGog2DrdMUHPsBORRs1a /CGaQBcf+9AqeV93BkTf3sOVRwH5kQNRswne/qo6FtQ2S8y7JwybZcYcn ExeWl4Ek2P2+nyDIgCpKIGFVj6RBI0J/QCjE0oOs8fGf3Xr9qpm/pIkfD w==; X-CSE-ConnectionGUID: ycDfQ159Q52OquxNui086Q== X-CSE-MsgGUID: Htks0LY0Tz2E6Ou+WxB4jw== X-IronPort-AV: E=Sophos;i="6.19,213,1754956800"; d="scan'208";a="4334930" Received: from ip-10-5-0-115.us-west-2.compute.internal (HELO smtpout.naws.us-west-2.prod.farcaster.email.amazon.dev) ([10.5.0.115]) by internal-pdx-out-012.esa.us-west-2.outbound.mail-perimeter.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Oct 2025 15:31:53 +0000 Received: from EX19MTAUWC001.ant.amazon.com [10.0.7.35:8640] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.54.171:2525] with esmtp (Farcaster) id 0a7c58d4-562e-4eb3-b770-43495007b45e; Wed, 8 Oct 2025 15:31:53 +0000 (UTC) X-Farcaster-Flow-ID: 0a7c58d4-562e-4eb3-b770-43495007b45e Received: from EX19D001UWA001.ant.amazon.com (10.13.138.214) by EX19MTAUWC001.ant.amazon.com (10.250.64.174) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Wed, 8 Oct 2025 15:31:50 +0000 Received: from dev-dsk-farbere-1a-46ecabed.eu-west-1.amazon.com (172.19.116.181) by EX19D001UWA001.ant.amazon.com (10.13.138.214) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.2562.20; Wed, 8 Oct 2025 15:31:37 +0000 From: Eliav Farber To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Linus Torvalds , David Laight , Lorenzo Stoakes Subject: [PATCH v3 07/19 5.15.y] minmax: simplify and clarify min_t()/max_t() implementation Date: Wed, 8 Oct 2025 15:29:32 +0000 Message-ID: <20251008152946.29285-8-farbere@amazon.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251008152946.29285-1-farbere@amazon.com> References: <20251008152946.29285-1-farbere@amazon.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: EX19D037UWC003.ant.amazon.com (10.13.139.231) To EX19D001UWA001.ant.amazon.com (10.13.138.214) From: Linus Torvalds [ Upstream commit 017fa3e89187848fd056af757769c9e66ac3e93d ] This simplifies the min_t() and max_t() macros by no longer making them work in the context of a C constant expression. That means that you can no longer use them for static initializers or for array sizes in type definitions, but there were only a couple of such uses, and all of them were converted (famous last words) to use MIN_T/MAX_T instead. Cc: David Laight Cc: Lorenzo Stoakes Signed-off-by: Linus Torvalds Signed-off-by: Eliav Farber --- V1 -> V2: Use `[ Upstream commit ]` instead of `commit upstream.` like in all other patches. include/linux/minmax.h | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/include/linux/minmax.h b/include/linux/minmax.h index a7ef65f78933..9c2848abc804 100644 --- a/include/linux/minmax.h +++ b/include/linux/minmax.h @@ -45,17 +45,20 @@ #define __cmp(op, x, y) ((x) __cmp_op_##op (y) ? (x) : (y)) -#define __cmp_once(op, x, y, unique_x, unique_y) ({ \ - typeof(x) unique_x = (x); \ - typeof(y) unique_y = (y); \ +#define __cmp_once_unique(op, type, x, y, ux, uy) \ + ({ type ux = (x); type uy = (y); __cmp(op, ux, uy); }) + +#define __cmp_once(op, type, x, y) \ + __cmp_once_unique(op, type, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_)) + +#define __careful_cmp_once(op, x, y) ({ \ static_assert(__types_ok(x, y), \ #op "(" #x ", " #y ") signedness error, fix types or consider u" #op "() before " #op "_t()"); \ - __cmp(op, unique_x, unique_y); }) + __cmp_once(op, __auto_type, x, y); }) #define __careful_cmp(op, x, y) \ __builtin_choose_expr(__is_constexpr((x) - (y)), \ - __cmp(op, x, y), \ - __cmp_once(op, x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y))) + __cmp(op, x, y), __careful_cmp_once(op, x, y)) #define __clamp(val, lo, hi) \ ((val) >= (hi) ? (hi) : ((val) <= (lo) ? (lo) : (val))) @@ -158,7 +161,7 @@ * @x: first value * @y: second value */ -#define min_t(type, x, y) __careful_cmp(min, (type)(x), (type)(y)) +#define min_t(type, x, y) __cmp_once(min, type, x, y) /** * max_t - return maximum of two values, using the specified type @@ -166,7 +169,7 @@ * @x: first value * @y: second value */ -#define max_t(type, x, y) __careful_cmp(max, (type)(x), (type)(y)) +#define max_t(type, x, y) __cmp_once(max, type, x, y) /* * Do not check the array parameter using __must_be_array(). -- 2.47.3