linux-kernel - [PATCH V6 08/10] fork: remove create_io

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Message-Id: <20211129194707.5863-9-michael.christie@oracle.com>
Date:   Mon, 29 Nov 2021 13:47:05 -0600
From:   Mike Christie <michael.christie@...cle.com>
To:     geert@...ux-m68k.org, vverma@...italocean.com, hdanton@...a.com,
        hch@...radead.org, stefanha@...hat.com, jasowang@...hat.com,
        mst@...hat.com, sgarzare@...hat.com,
        virtualization@...ts.linux-foundation.org,
        christian.brauner@...ntu.com, axboe@...nel.dk,
        linux-kernel@...r.kernel.org
Cc:     Mike Christie <michael.christie@...cle.com>
Subject: [PATCH V6 08/10] fork: remove create_io_thread

create_io_thread is not used anymore so remove it.

Signed-off-by: Mike Christie <michael.christie@...cle.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 ecb21c0d95ce..cef69ce64e6f 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 *fork_idle(int);
 struct mm_struct *copy_init_mm(void);
 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
diff --git a/kernel/fork.c b/kernel/fork.c
index e72239ae1e08..3d4586502190 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	= USER_WORKER | USER_WORKER_IO,
-	};
-
-	return copy_process(NULL, 0, node, &args);
-}
-
 static bool user_worker_flags_valid(struct kernel_clone_args *kargs)
 {
 	/* Verify that no unknown flags are passed along. */
-- 
2.25.1