kthread: Make struct kthread kmalloc'ed
authorOleg Nesterov <oleg@redhat.com>
Tue, 29 Nov 2016 17:50:57 +0000 (18:50 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 8 Dec 2016 13:36:18 +0000 (14:36 +0100)
commit1da5c46fa965ff90f5ffc080b6ab3fae5e227bc3
tree907dd44b43d3cf5f49be920c46a5592364bcb1e8
parent7c4788950ba5922fde976d80b72baf46f14dee8d
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>
include/linux/kthread.h
kernel/fork.c
kernel/kthread.c