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authorOleg Nesterov <oleg@redhat.com>2016-11-29 18:50:57 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-12-08 14:36:18 +0100
commit1da5c46fa965ff90f5ffc080b6ab3fae5e227bc3 (patch)
tree907dd44b43d3cf5f49be920c46a5592364bcb1e8 /kernel/fork.c
parent7c4788950ba5922fde976d80b72baf46f14dee8d (diff)
downloadlinux-1da5c46fa965ff90f5ffc080b6ab3fae5e227bc3.tar.bz2
kthread: Make struct kthread kmalloc'ed
commit 23196f2e5f5d "kthread: Pin the stack via try_get_task_stack() / put_task_stack() in to_live_kthread() function" is a workaround for the fragile design of struct kthread being allocated on the task stack. struct kthread in its current form should be removed, but this needs cleanups outside of kthread.c. As a first step move struct kthread away from the task stack by making it kmalloc'ed. This allows to access kthread.exited without the magic of trying to pin task stack and the try logic in to_live_kthread(). Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Chunming Zhou <David1.Zhou@amd.com> Cc: Roman Pen <roman.penyaev@profitbricks.com> Cc: Petr Mladek <pmladek@suse.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Tejun Heo <tj@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20161129175057.GA5330@redhat.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 600e93b5e539..7ffa16033ded 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -354,6 +354,8 @@ void free_task(struct task_struct *tsk)
ftrace_graph_exit_task(tsk);
put_seccomp_filter(tsk);
arch_release_task_struct(tsk);
+ if (tsk->flags & PF_KTHREAD)
+ free_kthread_struct(tsk);
free_task_struct(tsk);
}
EXPORT_SYMBOL(free_task);