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This patch moves us to a flags based approach for these types of users. Signed-off-by: Mike Christie Suggested-by: Christian Brauner Acked-by: Christian Brauner Reviewed-by: Christoph Hellwig Acked-by: Michael S. Tsirkin --- include/linux/sched/task.h | 4 +++- kernel/fork.c | 4 ++-- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h index 357e0068497c..a759ce5aa603 100644 --- a/include/linux/sched/task.h +++ b/include/linux/sched/task.h @@ -18,8 +18,11 @@ struct css_set; /* All the bits taken by the old clone syscall. */ #define CLONE_LEGACY_FLAGS 0xffffffffULL +#define USER_WORKER_IO BIT(0) + struct kernel_clone_args { u64 flags; + u32 worker_flags; int __user *pidfd; int __user *child_tid; int __user *parent_tid; @@ -31,7 +34,6 @@ struct kernel_clone_args { /* Number of elements in *set_tid */ size_t set_tid_size; int cgroup; - int io_thread; int kthread; int idle; int (*fn)(void *); diff --git a/kernel/fork.c b/kernel/fork.c index 9f7fe3541897..b030aefba26c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2100,7 +2100,7 @@ static __latent_entropy struct task_struct *copy_process( p->flags &= ~PF_KTHREAD; if (args->kthread) p->flags |= PF_KTHREAD; - if (args->io_thread) { + if (args->worker_flags & USER_WORKER_IO) { /* * Mark us an IO worker, and block any signal that isn't * fatal or STOP @@ -2623,7 +2623,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node) .exit_signal = (lower_32_bits(flags) & CSIGNAL), .fn = fn, .fn_arg = arg, - .io_thread = 1, + .worker_flags = USER_WORKER_IO, }; return copy_process(NULL, 0, node, &args);