From:   Mike Christie <michael.christie@oracle.com>
To:     geert@linux-m68k.org, vverma@digitalocean.com, hdanton@sina.com,
        hch@infradead.org, stefanha@redhat.com, jasowang@redhat.com,
        mst@redhat.com, sgarzare@redhat.com,
        virtualization@lists.linux-foundation.org,
        christian.brauner@ubuntu.com, axboe@kernel.dk,
        linux-kernel@vger.kernel.org
Cc:     Mike Christie <michael.christie@oracle.com>
Subject: [PATCH V5 08/10] fork: remove create_io_thread
Date:   Sun, 21 Nov 2021 11:49:28 -0600
Message-Id: <20211121174930.6690-9-michael.christie@oracle.com>
In-Reply-To: <20211121174930.6690-1-michael.christie@oracle.com>
References: <20211121174930.6690-1-michael.christie@oracle.com>
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?/MA8Gde2JRMUOD5z9L3tlwviNGrapEis0HLXse5dvl/nWWvtgutyVTIJew05?=
 =?us-ascii?Q?DWGwWytGocYMYDrvORgCN8vkVuHLp5JwyJDNx5f9M0PFkLx8R+kaaN+NuAVx?=
 =?us-ascii?Q?/X667ownb5L+nifNoXAa1Tl8yQJZxHJCLP3DIf/dF7inOVxRMxVnJLpi0P7Z?=
 =?us-ascii?Q?4xPU9dwV3jA/ak2DHN+X/Uh/vYzUUHyze1RMcCLdewAq9lZlOOF1UwfPgA/f?=
 =?us-ascii?Q?PN/8lERz7fRqVu75PFOqA3sEPRgM3/FchlzEmE9B4OFTBCu5CFJTH2S66xB0?=
 =?us-ascii?Q?tl8OMkH8rsdEZgdRfSlSwJNATkwecO/noPq8mX7pUyMTd6rgf39mGyX13eRv?=
 =?us-ascii?Q?5X6Je/On6UNMq2Fx/dni+qFgJCTWGbwbHG0BlcmUObhQTnEncIus6u8tEy9G?=
 =?us-ascii?Q?MvMvrRFMElG/Egz6JfZzfhwnNHyAKhUzPW/Yz+7fA1Uzbb3il7tO7aRVcTgD?=
 =?us-ascii?Q?jPYaRoSdUc2JuJPSB/YQq/G8S724cDgM6VpBEPND7lcKVZFZkTErQfyVG83f?=
 =?us-ascii?Q?xSeWmu+qT8YknOUYKo07e21XFJaVC0ddiTQXK7WAMYUAf0qsT6acBQk+3wO4?=
 =?us-ascii?Q?jNP4xmS8UV8l4rj+khcoblHkOjODDYP9EF6j+yyZcLM7sVby8jIimzikQjR6?=
 =?us-ascii?Q?2JIYdraC3eamJHLu/WCQpAMssdNPvNs+WQSL/K/gFNVkj9EU9YlvVj0E2t5q?=
 =?us-ascii?Q?BhIS1tssFr/9Llj+0B2x5Mb5erqFvfkciqrVuLQHl3UpZzTn6nblEo82etvs?=
 =?us-ascii?Q?sPTjK6faN4V0mm0+QoO2XBI/tvnZATRB0czvZyReruFk/jsIMFiZ8gj0VLEV?=
 =?us-ascii?Q?scCVdrNLPNcC6KrcnJTC97z+FVmrUJJh5jTy2hkoZpfd5mqo5Oi6g05gfVIz?=
 =?us-ascii?Q?a6jesj0wR4Pmm8bzuI5QzIlRrN94rwEAMdGwm17SeqYotMVJEnR0m3BN7ih0?=
 =?us-ascii?Q?MO++8eAt9avyz0QsybiWL2Jh0eeqqkBDl/KjqeRGS2fayhf3ok4s6bwjW7u6?=
 =?us-ascii?Q?nFiW3s2SR58p78wZBo09purRaUCslkYc/o8aY97uIBeghSIQHmRcf50t1l9f?=
 =?us-ascii?Q?h+rRCZ+26NuyDaHQqQ6ZH1x6Wnxs1bOQkwp2umLc8E2kMJxy7hiCVQlQC/wG?=
 =?us-ascii?Q?ZDGC9oa3nG9+kz/G7wAeDkf0RUHLbBdPtwupZDwBR/OS0HADi1YBoXnIT2zH?=
 =?us-ascii?Q?1M+H8uPerK8owkeiYcdr1NLfmSk3cyCuGkZvGkmlTzjt6rpSefjPS1f76VII?=
 =?us-ascii?Q?Wurwbhlna5Dk18SxbBgsi1JoXhbIF6qhO4wqCc4m4Aqg2cZUbtvfVdiGeYi+?=
 =?us-ascii?Q?aqguuWOvP22VSM4iprHIfoj1a7D5fAViUGh6PmR65AxlwQ+0gDVcYHoZaKCL?=
 =?us-ascii?Q?JK1wR9WPewA93XWttwUR2Vx0UBlzBV91npWKLMDBqFdR+L+xZ8SL9BB2lkfg?=
 =?us-ascii?Q?v+tcwrjct3nJm4l+Tev5jZXtnKO+uAr2wbsPBgilLdnRRJASt5fOUw5sOcR1?=
 =?us-ascii?Q?jqQRO4BNuWwKvB8GrSJ+8slRW2dj9P8fuvVRzU2SyqFrcadUKwY3Gyop2JTW?=
 =?us-ascii?Q?gBwIjTqbG5iZ6zOcX4+yndqzGq6J5BYEoZ6o/TWmdPdLs+LSz1CCuDcRB0Y9?=
 =?us-ascii?Q?NAMa6hX6KKacXXeUoiJVSZY/vuYMXATiLtjW+digg0mlo2tr8SnoXUQRTDOK?=
 =?us-ascii?Q?/34FGw=3D=3D?=
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 84cd9a2d-2cf3-4219-de63-08d9ad1750bb
X-MS-Exchange-CrossTenant-AuthSource: DM5PR10MB1466.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Nov 2021 17:49:50.1577
 (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: dM43RKGRM1evKHnpNsDLJOZx/aro9Gvuehyxu6YvijrSI8BQmalHWjLeml1jVZYGONg0smcR8UehaGBX/xLSIHebvtL7gI7yATBsZMonSyM=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR10MB5055
X-Proofpoint-Virus-Version: vendor=nai engine=6300 definitions=10175 signatures=668683
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 malwarescore=0
 mlxlogscore=999 bulkscore=0 mlxscore=0 suspectscore=0 adultscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000
 definitions=main-2111210110
X-Proofpoint-GUID: UaeVXnWTUdFDCuu0O3amLFb2-6kgwjl9
X-Proofpoint-ORIG-GUID: UaeVXnWTUdFDCuu0O3amLFb2-6kgwjl9
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

create_io_thread is not used anymore so remove it.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 include/linux/sched/task.h |  1 -
 kernel/fork.c              | 22 ----------------------
 2 files changed, 23 deletions(-)

diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index 2188be3a3142..313fb8c825ae 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -89,7 +89,6 @@ extern void exit_files(struct task_struct *);
 extern void exit_itimers(struct signal_struct *);
 
 extern pid_t kernel_clone(struct kernel_clone_args *kargs);
-struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node);
 struct task_struct *kernel_worker(int (*fn)(void *), void *arg, int node,
 				  unsigned long clone_flags, u32 worker_flags);
 __printf(2, 3)
diff --git a/kernel/fork.c b/kernel/fork.c
index 3729abafbdf9..1b44d048ec16 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2521,28 +2521,6 @@ struct mm_struct *copy_init_mm(void)
 	return dup_mm(NULL, &init_mm);
 }
 
-/*
- * This is like kernel_clone(), but shaved down and tailored to just
- * creating io_uring workers. It returns a created task, or an error pointer.
- * The returned task is inactive, and the caller must fire it up through
- * wake_up_new_task(p). All signals are blocked in the created task.
- */
-struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node)
-{
-	unsigned long flags = CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|
-				CLONE_IO;
-	struct kernel_clone_args args = {
-		.flags		= ((lower_32_bits(flags) | CLONE_VM |
-				    CLONE_UNTRACED) & ~CSIGNAL),
-		.exit_signal	= (lower_32_bits(flags) & CSIGNAL),
-		.stack		= (unsigned long)fn,
-		.stack_size	= (unsigned long)arg,
-		.worker_flags	= KERN_WORKER_IO | KERN_WORKER_USER,
-	};
-
-	return copy_process(NULL, 0, node, &args);
-}
-
 static bool kernel_worker_flags_valid(struct kernel_clone_args *kargs)
 {
 	/* Verify that no unknown flags are passed along. */
-- 
2.25.1