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authorChristoph Hellwig <hch@lst.de>2020-08-11 18:34:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-12 10:57:59 -0700
commit8043fc147a97ec2eefc582487f344f2cbe86d12e (patch)
tree05be60738ff9974830290aa6a4459336ecdd45d9 /include/linux/sched
parentf48ff83e9c1a8fc2e8bfedb4855933eb1ed159b2 (diff)
downloadlinux-stericsson-8043fc147a97ec2eefc582487f344f2cbe86d12e.tar.gz
kernel: add a kernel_wait helper
Add a helper that waits for a pid and stores the status in the passed in kernel pointer. Use it to fix the usage of kernel_wait4 in call_usermodehelper_exec_sync that only happens to work due to the implicit set_fs(KERNEL_DS) for kernel threads. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Luis Chamberlain <mcgrof@kernel.org> Link: http://lkml.kernel.org/r/20200721130449.5008-1-hch@lst.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/task.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index ae3060f0b0c9..a98965007eef 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -88,6 +88,7 @@ struct task_struct *fork_idle(int);
struct mm_struct *copy_init_mm(void);
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern long kernel_wait4(pid_t, int __user *, int, struct rusage *);
+int kernel_wait(pid_t pid, int *stat);
extern void free_task(struct task_struct *tsk);