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kthread: update comment for __to_kthread 

With commit 343f4c49f2 ("kthread: Don't allocate kthread_struct for init
and umh") and commit 753550eb0c ("fork: Explicitly set PF_KTHREAD"), umh
task no longer have struct kthread and PF_KTHREAD flag.

Update the comment to describe what the current rules are to detect
is something is a kthread.

Link: https://lkml.kernel.org/r/20250620100801.23185-1-jqqlijiazi@gmail.com
Signed-off-by: Jiazi Li <jqqlijiazi@gmail.com>
Signed-off-by: mingzhu.wang <mingzhu.wang@transsion.com>
Suggested-by Eric W . Biederman <ebiederm@xmission.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
pull/1313/head
Jiazi Li 2025-06-20 18:07:56 +08:00 committed by Andrew Morton
parent caf728dfa7
commit fed307b67c
1 changed files with 5 additions and 6 deletions
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11
kernel/kthread.c
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@ -88,13 +88,12 @@ static inline struct kthread *to_kthread(struct task_struct *k)
/*
* Variant of to_kthread() that doesn't assume @p is a kthread.
*
* Per construction; when:
* When "(p->flags & PF_KTHREAD)" is set the task is a kthread and will
* always remain a kthread. For kthreads p->worker_private always
* points to a struct kthread. For tasks that are not kthreads
* p->worker_private is used to point to other things.
*
* (p->flags & PF_KTHREAD) && p->worker_private
*
* the task is both a kthread and struct kthread is persistent. However
* PF_KTHREAD on it's own is not, kernel_thread() can exec() (See umh.c and
* begin_new_exec()).
* Return NULL for any task that is not a kthread.
*/
static inline struct kthread *__to_kthread(struct task_struct *p)
{