From nobody Sun Nov 24 03:51:49 2024 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (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 834E5218322; Thu, 7 Nov 2024 19:09:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.165.32 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731006564; cv=fail; b=onsHGRd/28nsU3NTYELPaM5M3oENjYk34MApNzWmWBt0HJe7rJinyvGa0MdTSW32rjMh2QSe6jafwbl2MBSMVRAnnIsD/zvjpmAoMY9BJL1XZwbOGzI+b/sHTnSNLfePY4mZgFYfxl4CtigMDwcKwiDNIUk7lL89wyawl+Dw2Lw= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731006564; c=relaxed/simple; bh=JYn5wVW8/k2YULpQUQWZW2RCzfJBbpHpkZ6dIdagIZI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=m3W7hQq5hw1xijKyp2GRDBHyKbMMKfNci8Sj9cKx0sRImXeYUaQcEcASNB4m5mlMm+M2YLREiVP/vR+Wgj7Bwq7sWSOw6jtUYJ/v3jL5moUAUOqI6YfNy1XXiv9U/4fyVwxTbtx+BaCp35cuhigU3g6KGeL80MuZGAzwtr1KTBI= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=EFDl42AA; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=FRfcz6Rw; arc=fail smtp.client-ip=205.220.165.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="EFDl42AA"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="FRfcz6Rw" Received: from pps.filterd (m0246617.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4A7HBd6s002605; Thu, 7 Nov 2024 19:08:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2023-11-20; bh=QVSV206N3GHQLIOxxufrNmI2FZJL2ktslxGjHp7FL+M=; b= EFDl42AA8IEjLuJqGFYM1drzrCOKXvxNhmRAaNbH61BsZZUmU4p6kiON623vSN5m eUCIKKCeXsU9TsPWIt8xQf1OgkzafzNcIn4Hk+49e5bWF2vw9PmOPR3DoxdC0MxL ZGfRsOAp9a68a7mMpgAgVNijs0ER7GQRMIduYUzVWcb2Btt84xZE0R3WujU84uQC VIf8Mbw41CxJkDrUHT2oAQzQwce0XHplxSxwM56scvZsUAZ1O9MVZyDt/2wDu9Ig RyiE7bs0h0viKkOmObKllKdtQ89Fht/Gxg0tgfrMF4sjSDqi0YxuYf5LuqAONCv8 YjzO4+VOoTx/luTGwRbBDA== Received: from iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (iadpaimrmta02.appoci.oracle.com [147.154.18.20]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42ncmtbbbg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Nov 2024 19:08:42 +0000 (GMT) Received: from pps.filterd (iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com [127.0.0.1]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 4A7InMAG036151; Thu, 7 Nov 2024 19:08:41 GMT Received: from nam11-co1-obe.outbound.protection.outlook.com (mail-co1nam11lp2174.outbound.protection.outlook.com [104.47.56.174]) by iadpaimrmta02.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTPS id 42nahgsus5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Nov 2024 19:08:41 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=seHSIipGPEQhS0/xIvBxEDaPTFGeTjMVFFukR7UAMzxT8djuIEpTKaabusYyfV35PRwcw+HnbZHxW7tO9KAezLdyzpo72D/+/UELQC8t0VC+mDdFTSmHfdxf4kziJ3lIY+cIgrZU+XEnuekAtjwYHX8tDz3qasS49qvr6pxrcDeFRqAchjl89H5jg7LsgtSZLuQytEQLjrl8iQRWEx5rW7FXnjNFhKHTk7jrRoJ5XNv+VCSZpscrEapY3QqafU95JHLzFHy1gsdTbzpHuPWpnV5fzY/zgt0pEOhipTnMZJ03VKW51EeUn+xQ0/ieK244p0t44WqO+XZMUs0xMzER0A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=QVSV206N3GHQLIOxxufrNmI2FZJL2ktslxGjHp7FL+M=; b=CkEsD1aNb5G6NeTy7/768rpPkXRGpbK4+c7EFjCFStC5IdU9+Iwkq1Bvn8CR4GPLJP108C21JaQnczJJExsGDrh3IhEAs6Z+RR51xYPc8zQ5c0R4Wu+hwzjgFCpFgdZAjwATX1TDCRvYTTkeyCcU2f+2zZP4ES2eRyvI83VMXrYCrevsZucxEQKTJo6eeZpRd1WSJCfO+V+oUtUp6apfWi/LtsDPHGQJBaWyEWlM9wjbhxVxaT3sO9vgLJ5BkRl3WB+O1joVmEjnIvjU0jvWBQo1zSYqFXvvr9urbybIBZ9jOMfJZhfb3D2KDg++L+qi7jh0q2l7WSxu+f7jhL3vhQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=QVSV206N3GHQLIOxxufrNmI2FZJL2ktslxGjHp7FL+M=; b=FRfcz6RwAismBljLE0g0KttETzFHAQHEPzfQW7e8EcGY2BXXLVLGrfEWAkrPcrqiDFHYTgqFZE4s60xbha0ZYrr9t2FRxjGxXDlZzdAywwQ3kM9nqgisZxYpbHQtuKIq/uRAkvKsWiqP6giLXyrAx96Hh/cggU9pL7mqP7SH1So= Received: from CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) by CY8PR10MB7148.namprd10.prod.outlook.com (2603:10b6:930:71::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8137.20; Thu, 7 Nov 2024 19:08:33 +0000 Received: from CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::25a9:32c2:a7b0:de9e]) by CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::25a9:32c2:a7b0:de9e%5]) with mapi id 15.20.8137.019; Thu, 7 Nov 2024 19:08:33 +0000 From: Ankur Arora To: linux-pm@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, vkuznets@redhat.com, rafael@kernel.org, daniel.lezcano@linaro.org, peterz@infradead.org, arnd@arndb.de, lenb@kernel.org, mark.rutland@arm.com, harisokn@amazon.com, mtosatti@redhat.com, sudeep.holla@arm.com, cl@gentwo.org, maz@kernel.org, misono.tomohiro@fujitsu.com, maobibo@loongson.cn, zhenglifeng1@huawei.com, joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com Subject: [PATCH v9 05/15] arm64: barrier: add support for smp_cond_relaxed_timeout() Date: Thu, 7 Nov 2024 11:08:08 -0800 Message-Id: <20241107190818.522639-6-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20241107190818.522639-1-ankur.a.arora@oracle.com> References: <20241107190818.522639-1-ankur.a.arora@oracle.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MW4PR04CA0093.namprd04.prod.outlook.com (2603:10b6:303:83::8) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|CY8PR10MB7148:EE_ X-MS-Office365-Filtering-Correlation-Id: 4d913a48-1157-4b18-8cda-08dcff5f9312 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?Y6eHZHFZnflEs5voIF/jAN+045gU/c+X/ZcZqtYiflo7ekrFdlPhAGSnXamQ?= =?us-ascii?Q?wUY4DR+pEgI7SnzLNDkR8Abi8jG3qFyxyApsD63bpd9s4kRdkAMXepPyTWsT?= =?us-ascii?Q?ILbcwcxHBTdkuyIiq9QEO83Rf+yReOL9ykmA9E3XUw6568o7Xw0RXfJ/phdC?= =?us-ascii?Q?kfkTuV4QYD6iJ6UCqAWN7paRmJ9gNq5lJQuubT5Stiy4zhI3b3qr0WHoLahQ?= =?us-ascii?Q?gja+zr24GJhhHBXX94Ol3ifn2BKxCSoQQfxQrAVU33z3ZJ9DpUB3JNw9xz4S?= =?us-ascii?Q?+afzPgvi5scTSqwPWT9IsRs0+aJq98W8hPK/pzJEBg1U4r6hjoROVz8tiOx1?= =?us-ascii?Q?lU0p5MZkc9e/fbXui26mJ9fv/Qb/LIau6heqLOENrqrIfilWAz09m6G471rT?= =?us-ascii?Q?d12ubwUj3Y66vr2XlJ1xBCa5RT2u4o3JZnnGyo4rLy4xZlccmrr6U3UwRto1?= =?us-ascii?Q?gLTeBE/T+7RR6NpH9JydJnwYNflOgkO8r2i9rRtGOLYWQiIvUJp5d5LJwbuj?= =?us-ascii?Q?3rFfddhUq8mLy8bKFazaPLxuW9jjjHU7wd8ocOinOC+wfGylhfMvchfP5F9R?= =?us-ascii?Q?uhiOw41vxycNWn67WRZ3Oh62F5/LDUWXFQEXUpN2JtRW/Z5sAU7xOxbNOWcU?= =?us-ascii?Q?9OQPkFOLc7GkoRghE4MsafnBNgqKQyrTLUaMxwvCddtMrnJkWqlCYMEHx6zE?= =?us-ascii?Q?W7WWYSrizrh/enQ1DQvtaOrf2/Na6WyP1YvMOHV8knbo6Z/VUSSyUl1pu5jY?= =?us-ascii?Q?6vaLzWCjckl6X1jRTaUh+f7QfA21NXXxz8JhgHUKpIKskeFRIdxNlx2akySX?= =?us-ascii?Q?g552tc3/c9QmDaTJTw4aCRvmB8KBgPw+dKVc+UUBn0VCG9B0btUOQTv/x7VC?= =?us-ascii?Q?ZhqK9F9nrdbGpB2ZzpZ2LxWfTOAeKQkhDHAG8gsAuyPKN6XmkWYvBj/Se5st?= =?us-ascii?Q?klcOrvflCbGcZwcah+G76gZOVSOwjAZjZ3aOI65iqBffGfG0AiXvBn5tf6V/?= =?us-ascii?Q?m/aeyxd3t56fI+2Q63zk1DfunlsAJv9q8SLxFo9RW+qPwuJf1DVkRfyF6Ixx?= =?us-ascii?Q?EVphvZJ1SplbbDdhSQbftzrF4BZY0jf8t9mA4ldcls/CmEIAcx0INYIxYaV7?= =?us-ascii?Q?CFNWQyUYu0c6a2g+h00AdqK55NnNpYW7mZ5NYYkJ2h9uhG8aCd50plWgQeVo?= =?us-ascii?Q?4mbX1/S1g0Nql7p7OjcO0ehYVobzoNGGCauxRYXh1FP596MirNuJTpi/vnpH?= =?us-ascii?Q?tCyJZAXhIMwDVnvDPs5iwBLAPdSPd5uTSDKTVgPhy6BYVvwS8+nM654R3U2Q?= =?us-ascii?Q?pbM=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO6PR10MB5409.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(7416014)(376014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?7W98LfaNJCkCUYu5vCJaKEUyTYtdgFs5M0o6NHd5ZghjYE8srNmIbdof9dMn?= =?us-ascii?Q?mxY93rGIv+JFRNAuQbItT+ZMDpDuHSvvHP4rKTfXepXZ7ZiHZczFGYVoaB+3?= =?us-ascii?Q?SYlYVHMMpnI3WQQ6+s33fxYUMxlqMkwYPdMdWMYhreFOoNZad9P6xOvFXVQu?= =?us-ascii?Q?OfqFOy6LKdDEYqHA/ccjx0mBcA4UAeuN8nqCgHK8T/6hwcsHIMJRt9TkUZuH?= =?us-ascii?Q?QupQ5r54Q8y8IIcEtxfasHYB5jyMWMYkbCureTAfKx7auaByMfn1Nn5ssw8Z?= =?us-ascii?Q?KIFb3tN90qOTlOd+Xbj1BUEBn7zhHSsh3PtFUpvdJGbl97MLol3FC898dsOO?= =?us-ascii?Q?Wmz/PlxXiQT22hjsFlWQQGsAYOEnDFQtT9uhC5Oh7+XOPBypNG3QHTNPhMaT?= =?us-ascii?Q?qjAgSI1h2YDouwFt8W1N5mTxjkVTVn0A6XrycJdDP7gX1u0X0LLIRdO6tziN?= =?us-ascii?Q?TM25vJUDxi/hW801iUmKLOiTkKjU0SOuGWyGEBV1u4R/ML8N5iHX7tnmwrE3?= =?us-ascii?Q?frfz/rCbUf5XLHgnRn0CZLw/hBT+yojbgmEnyEOlFnx15Flxlk7buTJXKELf?= =?us-ascii?Q?C+sJfxZzch/8+YRj/PC6a7NUQ6WBZ9u52C1DOpdKb4DVAW9tAsGcpDDw6qf0?= =?us-ascii?Q?ZlkbP8K0t0fHs76zYcgfGvFK+3ZK88el76v8PrDrFSY/zZ5rJdgtSiEXt7P9?= =?us-ascii?Q?YyTGnHHBgUNBBJx/Op+mvh3ioXVyLPPO3PN5FZVJrjqSdGLT0b96oHwieSZV?= =?us-ascii?Q?T/ceTC2vjtoQ8SREOw6RoQ0TjziBgqPKzq7sXDGe9opRQnAW7LOCBeGsi607?= =?us-ascii?Q?Kjnw8Fe3PtKgtEMnDmiDPpTAcgr61VPgENIwvg6Xmi2gwIYi+9YJHz96wVtf?= =?us-ascii?Q?RxL73DaXinYAp3m3Go7ehY+ZnKL1xAWua6yOb2IExqjyTD6iiliBDhIkfwe1?= =?us-ascii?Q?aq8Z5/Bwo7K0oDpS4QwsxipqN06swYpta+yd4lLW+HVv1hoDt9XUDkBQzzz3?= =?us-ascii?Q?JgkdFR6ringlfGwga6BYhJZc3awfQC1KFmr32Ut1vZ/qvPgYuHdqR5OHuo1M?= =?us-ascii?Q?KPWiSnPyXOQK44NeiBiqbpFze8HKv6fnrfDPFx6RtmmyOr4kwARdglauphCD?= =?us-ascii?Q?wXev9EVer6V1FOboi2jxq7IhZuhRmsyaZQ+mWk0AN3bMay4olddL7jyD+EW0?= =?us-ascii?Q?jCjU4SawPi7yUAZxXbHrNv+qEOOyLDtpHkY7MrOWy0mOmzNqmOdUtQbgSrQO?= =?us-ascii?Q?LC/8pFzZMcQBXI+vyLd5JNZEm4HfJhH/zsbWJHtef06zHXX3azXr2mGVRLwb?= =?us-ascii?Q?q/G2/yGGSeeisg28EOwA/4r5lEC6YdxZ6W0PuzLiwqW+/BAAKuOaMJG58mIs?= =?us-ascii?Q?se0OTf5pZnH9/NMNAecdFR6BBQrG4mvFkcUwjPSVqilUXooSYCWmkIA2YV0Z?= =?us-ascii?Q?2CitS9lyVcycbSqse9qvs/+TSa1aDyosD2VdH0vngqEnRcCUdFbQjIo5N3n+?= =?us-ascii?Q?LlORWhsTum8Qi0t8RF/my6vRGqxHd+RoUI5B+I6Jl9JSaGzg+dl0TsvDeVHJ?= =?us-ascii?Q?jMH9p2ItXNd166ZHOzEiEwHHwnnyC1DPOyE4+ztGXCN7PRS0pP+MCKw9XkUg?= =?us-ascii?Q?QQ=3D=3D?= X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4d913a48-1157-4b18-8cda-08dcff5f9312 X-MS-Exchange-CrossTenant-AuthSource: CO6PR10MB5409.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2024 19:08:33.7386 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: YNe/rJaMsvCPSKTYLsm4zVnH8jovxrVFYCnphYZLll9JsE4NW00GBkYT92YhYtzjN3vDg//q+BcKhHa0Od8AmA6ntvT/F4sUQJuODg4nLR8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR10MB7148 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-07_08,2024-11-07_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 mlxscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411070150 X-Proofpoint-GUID: -IyB3pGUmSkPCHRc5sUAyhKL3GwhKnnk X-Proofpoint-ORIG-GUID: -IyB3pGUmSkPCHRc5sUAyhKL3GwhKnnk Content-Type: text/plain; charset="utf-8" Support a waited variant of polling on a conditional variable via smp_cond_relaxed_timeout(). This uses the __cmpwait_relaxed() primitive to do the actual waiting, when the wait can be guaranteed to not block forever (in case there are no stores to the waited for cacheline.) For this we depend on the availability of the event-stream. For cases when the event-stream is unavailable, we fallback to a spin-waited implementation which is identical to the generic variant. Signed-off-by: Ankur Arora --- arch/arm64/include/asm/barrier.h | 54 ++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barr= ier.h index 1ca947d5c939..ab2515ecd6ca 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -216,6 +216,60 @@ do { \ (typeof(*ptr))VAL; \ }) =20 +#define __smp_cond_load_timeout_spin(ptr, cond_expr, \ + time_expr_ns, time_limit_ns) \ +({ \ + typeof(ptr) __PTR =3D (ptr); \ + __unqual_scalar_typeof(*ptr) VAL; \ + unsigned int __count =3D 0; \ + for (;;) { \ + VAL =3D READ_ONCE(*__PTR); \ + if (cond_expr) \ + break; \ + cpu_relax(); \ + if (__count++ < smp_cond_time_check_count) \ + continue; \ + if ((time_expr_ns) >=3D time_limit_ns) \ + break; \ + __count =3D 0; \ + } \ + (typeof(*ptr))VAL; \ +}) + +#define __smp_cond_load_timeout_wait(ptr, cond_expr, \ + time_expr_ns, time_limit_ns) \ +({ \ + typeof(ptr) __PTR =3D (ptr); \ + __unqual_scalar_typeof(*ptr) VAL; \ + for (;;) { \ + VAL =3D READ_ONCE(*__PTR); \ + if (cond_expr) \ + break; \ + __cmpwait_relaxed(__PTR, VAL); \ + if ((time_expr_ns) >=3D time_limit_ns) \ + break; \ + } \ + (typeof(*ptr))VAL; \ +}) + +#define smp_cond_load_relaxed_timeout(ptr, cond_expr, \ + time_expr_ns, time_limit_ns) \ +({ \ + __unqual_scalar_typeof(*ptr) _val; \ + \ + int __wfe =3D arch_timer_evtstrm_available(); \ + if (likely(__wfe)) \ + _val =3D __smp_cond_load_timeout_wait(ptr, cond_expr, \ + time_expr_ns, \ + time_limit_ns); \ + else \ + _val =3D __smp_cond_load_timeout_spin(ptr, cond_expr, \ + time_expr_ns, \ + time_limit_ns); \ + (typeof(*ptr))_val; \ +}) + + #include =20 #endif /* __ASSEMBLY__ */ --=20 2.43.5