The vhost worker threads need the same frame setup as io_uring's worker
threads, but do not handle signals and may not even be executing IO. This
moves the setup part to a new flag.
Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
arch/x86/kernel/process.c | 4 ++--
include/linux/sched.h | 1 +
include/linux/sched/task.h | 1 +
kernel/fork.c | 3 +++
4 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 1d9463e3096b..ccdec11cd120 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -178,9 +178,9 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg,
task_user_gs(p) = get_user_gs(current_pt_regs());
#endif
- if (unlikely(p->flags & PF_IO_WORKER)) {
+ if (unlikely(p->flags & PF_USER_WORKER)) {
/*
- * An IO thread is a user space thread, but it doesn't
+ * An user worker thread is a user space thread, but it doesn't
* return to ret_after_fork().
*
* In order to indicate that to tools like gdb,
diff --git a/include/linux/sched.h b/include/linux/sched.h
index e12b524426b0..817d3a7bec77 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1664,6 +1664,7 @@ extern struct pid *cad_pid;
#define PF_VCPU 0x00000001 /* I'm a virtual CPU */
#define PF_IDLE 0x00000002 /* I am an IDLE thread */
#define PF_EXITING 0x00000004 /* Getting shut down */
+#define PF_USER_WORKER 0x00000008 /* Userspace kernel worker */
#define PF_IO_WORKER 0x00000010 /* Task is an IO worker */
#define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */
#define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index d0b0872f56cc..4a6100a24894 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -33,6 +33,7 @@ struct kernel_clone_args {
int cgroup;
int io_thread;
int no_files;
+ int user_worker;
struct cgroup *cgrp;
struct css_set *cset;
};
diff --git a/kernel/fork.c b/kernel/fork.c
index a0468e30b27e..1dda1d4ea77b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2041,6 +2041,8 @@ static __latent_entropy struct task_struct *copy_process(
siginitsetinv(&p->blocked, sigmask(SIGKILL)|sigmask(SIGSTOP));
}
+ if (args->user_worker)
+ p->flags |= PF_USER_WORKER;
/*
* This _must_ happen before we call free_task(), i.e. before we jump
* to any of the bad_fork_* labels. This is to avoid freeing
@@ -2563,6 +2565,7 @@ struct task_struct *kernel_copy_process(int (*fn)(void *), void *arg, int node,
.stack_size = (unsigned long)arg,
.io_thread = io_thread,
.no_files = no_files,
+ .user_worker = 1,
};
return copy_process(NULL, 0, node, &args);
--
2.25.1
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