This patchset adds a couple new options to kernel_clone_args for the vhost layer which is going to work like PF_IO_WORKER but will differ enough that we will need to add several fields to kernel_clone_args. This patch moves us to a flags based approach for these types of users.
Signed-off-by: Mike Christie <[email protected]> Suggested-by: Christian Brauner <[email protected]> Acked-by: Christian Brauner <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> --- 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 b9198a1b3a84..0bf95966ae7d 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; struct cgroup *cgrp; struct css_set *cset; }; diff --git a/kernel/fork.c b/kernel/fork.c index d75a528f7b21..9273fd81a329 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1998,7 +1998,7 @@ static __latent_entropy struct task_struct *copy_process( p = dup_task_struct(current, node); if (!p) goto fork_out; - 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 @@ -2497,7 +2497,7 @@ struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node) .exit_signal = (lower_32_bits(flags) & CSIGNAL), .stack = (unsigned long)fn, .stack_size = (unsigned long)arg, - .io_thread = 1, + .worker_flags = USER_WORKER_IO, }; return copy_process(NULL, 0, node, &args); -- 2.25.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
