tree 20adf69bcf0f58bc5d021ae478ff91572b44cb67
parent 6b9ba895dd4fb93679e814241f08e2106bfe1670
author Paul E. McKenney <paulmck@linux.ibm.com> 1554213533 -0700
committer Paul E. McKenney <paulmck@linux.ibm.com> 1554494437 -0700

rcu: Forbid DEFINE{,_STATIC}_SRCU() from modules

Adding DEFINE_SRCU() or DEFINE_STATIC_SRCU() to a loadable module
requires that the size of the reserved region be increased, which is
not something we want to be doing all that often.  Instead, loadable
modules should define an srcu_struct and invoke init_srcu_struct()
from their module_init function and cleanup_srcu_struct() from their
module_exit function.  Note that modules using call_srcu() will also
need to invoke srcu_barrier() from their module_exit function.

This commit enforces this advice by refusing to define DEFINE_SRCU()
and DEFINE_STATIC_SRCU() within loadable modules.

Suggested-by: Barret Rhoden <brho@google.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Looks-great-to-me-by: Tejun Heo <tj@kernel.org>