[RFC PATCH 07/24] fork: expose vfork completion helper
From: Li Chen <hidden>
Date: 2026-07-16 14:36:51
Also in:
linux-arch, linux-doc, linux-fsdevel, linux-kselftest, linux-mm, linux-security-module, lkml
Subsystem:
exec & binfmt api, elf, memory management - core, scheduler, the rest · Maintainers:
Kees Cook, Andrew Morton, David Hildenbrand, Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
Allow process builders that call copy_process() directly to attach and wait for the existing vfork completion without duplicating its signal and task-reference handling. Assisted-by: Codex:gpt-5.6-sol Signed-off-by: Li Chen <redacted> --- include/linux/sched/task.h | 3 +++ kernel/fork.c | 3 +-- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index e0c1ca8c6a188..92b4e3bc31e66 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h@@ -14,6 +14,7 @@ struct task_struct; struct rusage; +struct completion; union thread_union; struct css_set;
@@ -99,6 +100,8 @@ extern void exit_itimers(struct task_struct *); extern pid_t kernel_clone(struct kernel_clone_args *kargs); struct task_struct *copy_process(struct pid *pid, int trace, int node, struct kernel_clone_args *args); +int wait_for_vfork_done(struct task_struct *child, + struct completion *vfork); struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node); struct task_struct *fork_idle(int); extern pid_t kernel_thread(int (*fn)(void *), void *arg, const char *name,
diff --git a/kernel/fork.c b/kernel/fork.c
index f3f378a85be4c..970810a01bbf6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c@@ -1435,8 +1435,7 @@ static void complete_vfork_done(struct task_struct *tsk) task_unlock(tsk); } -static int wait_for_vfork_done(struct task_struct *child, - struct completion *vfork) +int wait_for_vfork_done(struct task_struct *child, struct completion *vfork) { unsigned int state = TASK_KILLABLE|TASK_FREEZABLE; int killed;
--
2.52.0