[PATCH v3 15/17] fork: use SIG_KERNEL_ONLY_MASK for the user worker signal mask

[Christian Brauner <brauner@kernel.org>]

For a user worker copy_process() blocks every signal except for SIGKILL
and SIGSTOP. Use SIG_KERNEL_ONLY_MASK instead of open-coding it.

No functional changes.

Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---
 kernel/fork.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index fd2829b0a8b6..be5980d0dd9f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2146,12 +2146,9 @@ __latent_entropy struct task_struct *copy_process(
 	if (args->kthread)
 		p->flags |= PF_KTHREAD;
 	if (args->user_worker) {
-		/*
-		 * Mark us a user worker, and block any signal that isn't
-		 * fatal or STOP
-		 */
+		/* A user worker takes only the signals nobody can block. */
 		p->flags |= PF_USER_WORKER;
-		siginitsetinv(&p->blocked, sigmask(SIGKILL)|sigmask(SIGSTOP));
+		siginitsetinv(&p->blocked, SIG_KERNEL_ONLY_MASK);
 	}
 	if (args->io_thread)
 		p->flags |= PF_IO_WORKER;

-- 
2.53.0