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    Subject[PATCH V5 08/10] fork: remove create_io_thread
    Date
    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
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